Fermentative Production of L-Lysine: Bacterial Fermentation-I
Abdul Haleem Shah,
Gul Majid Khan
Lysine is an essential,
economically important amino acid used as food and feed supplement.
It has also some pharmaceutical applications in the formulation of diets
with balanced amino acid composition and in amino acid infusions. Chemical,
enzymatic and fermentation processes have been used to synthesize lysine.
This review outlines the efforts of various researchers, which provide
useful information regarding the fermentative production of lysine by
bacteria. It also discusses different methods, including the development
of new auxotrophic mutants and optimization of culture conditions used
in order to improve the total yield and quality of lysine.
Lysine is one of the essential amino acids not synthesized biologically
in the body. Children and growing animals have a high requirement of lysine,
since it is needed for bone formation. Lysine is generally recognized as the
most deficient amino acid in the food supply of both man and domestic meat producing
animals. Since animal feed, such as grain and defatted oil seeds contain only
small quantities of lysine, poultry, cattle and other live stocks are unable
to synthesize this amino acid. So it must be added to these feed stuff to provide
adequate diet (Tosaka et al., 1983).
Dagley and Mangioli (1950) described the excretion of small amount of alanine, glutamic acid, aspartic acid and histidine in a culture of E. coli. They also found that addition of ammonium salt in excess of that required for growth resulted in increased amino acid production. The principles of the fermentative method quickly gained acceptance, and systematic work soon began on the production of other amino acids. This marked the birth of the amino acid fermentation industry (Aida, 1972).
Research on the possible utilization of wild strain revealed that many microorganisms, such as bacteria, yeast, filamentous fungi and actinomycetes, accumulated amino acids in culture containing a supplementary source of nitrogen. Many efforts have recently been devoted to elucidating the mechanisms of microbial production of amino acids. The most outstanding results concern metabolic regulation and amino acid transport. The biosynthetic pathways of most amino acids are now well documented, and the focus of attention has therefore, moved to metabolic control and its break down, including the genus and species specificity of the phenomenon (Aida, 1972).
Protein production by microorganisms rich in essential amino acids has been studied in many laboratories, both as a food supplement and as a source of amino acid. Fifteen amino acids were found in cell hydrolyzate, of which arginine (1.14 g L-1) and L-lysine 0.4g L-1 were the most abundant (Nakayama, 1972).
Most natural strains cannot produce industrially significant amounts of L-lysine in the culture broth due to various metabolic regulation mechanisms. However, alteration of these mechanism can lead to L-lysine accumulation (Nakayama, 1972). Two distinct biosynthetic pathways are known for L-lysine production. In certain actinomycetes fungi and algae the carbon skeleton of L-lysine arises from acetate and α-ketoglutarate by biosynthetic sequences that include α-amino adipic acid. The other pathway has been found in bacteria, higher plants, blue green algae and certain fungi (some phycomycetes) and protozoa. The L-lysine carbon chain is synthesized from pyruvate and aspartate and α-ε-diaminopimelic acid is a key intermediate.
Production of L-lysine by bacteria: Kinoshita et al. (1958) for
the first time developed homoserine auxotroph of Micrococcus glutamicus
by UV radiation and found it able to accumulate large amounts of L-lysine in
the culture broth. The chief ingredients in the medium were 2.5% glucose, 0.5%
NH4Cl, 0.2% NZ amine and mineral salts. Many other microorganisms
with similar mutational block have been isolated (Nakayama et al., 1961).
Whites (1972) medium was found to be the best one. With optimum glucose,
ammonium nitrate and biotin, the strain AEC V1 yielded 36 g L-lysine per liter
in flask culture (Samanta and Bhattacharyya, 1991). Sen and Chatterjee (1983),
isolated Arthrobacter globiformis from Burdwan (India) soil and found
it able to accumulate 3.4 g L-1, L-lysine in the growth medium. The
strain grew and accumulated L-lysine in purely synthetic medium. Among the different
hydrocarbon and nitrogen source tested straight run (SR) gas oil at 4% and ammonium
sulphate at 0.4%, respectively, were found most to be suitable. Different vitamins
and antibiotics stimulated growth and L-lysine yield; inoculum of 7% (v/v) of
the medium was found to be optimal. The yield of L-lysine under optimal condition
was 3.4 g per liter medium. Sen et al. (1983) isolated Micrococcus
varians from Assam (India) soil and was able to accumulate 2.6 g L-1
L-lysine in a purely synthetic medium under optimal conditions. The supplementation
of the synthetic medium with casamino acids significantly improved the yield.
Sen (1985) tested 263 hydrocarbon utilizer strains for their L-lysine production.
He observed that only 24 isolates (9%) produced L-lysine, but most of them as
mixture with other amino acids. Two isolates (8.5%) were found to produce L-lysine
alone. The isolates were identified as Arthrobactor globiformis and Micrococcus
varians, respectively. Sen and Chatterjee (1985) found that at optimum pH,
carbon and nitrogen sources, a hydrocarbon utilizing strain of Arthrobactor
globiformis yielded 3.4 g L-1 L-lysine in the medium and addition
of antibiotic and micro nutrients to that optimal media stimulated cell growth
and enhanced L-lysine yield.
Samanta et al. (1988) isolated a number of methionine plus threonine double auxotrophs from a glutamate producing Arthrobactor globiformis by mutagenesis with N-methyl-N-nitro-N-nitroso-guanidine. Sen and Chatterjee (1989) further studied the effect of B-Vitamins and trace element on L-lysine production by Micrococcus varians 2 Fa, which produced 2.6 g L-1 L-lysine. Addition of B-vitamins and trace elements to the optimal media has been found to stimulate growth and enhance L-lysine yield.
Bhattacharyya and Samanta (1992) isolated a few microorganisms, among them an L-lysine excreter (2 g L-1) was identified as Arthrobacter globiformis TR 9 and was selected for further improvement. Sano and Shiio (1970) developed AEC resistance mutant of Bacillus subtilis, Brevibacterium flavum and E. coli. Among them, B. flavum mutant resistant to the growth inhibition of AEC plus threonine was the best one, producing 32 g L-lysine for 100g glucose. One of the mutants HBR-2 (Thialysiner, Leucine¯, Homoserine-) produced L-lysine at a concentration of 30 mg ml-1 in a molasses medium containing 10% reducing sugar. (Hagino et al., 1981).
Kalcheva et al. (1991) observed that a low concentration of dimethyl sufoxide had a stimulatory effect on L-lysine production by the methionine sensitive mutant of Bacillus subtilis. Crociani et al. (1991) isolated auxotrophic regulatory mutant of Bacillus stearothermophilus that is a mutant which was resistant to S-(2-aminoethyl-L-cystine) and homoserine super (negative), produced L-lysine at the concentration of 7.5 g L-1.
In immobilized cell preparations, growth of cells outside the immobilization matrix, as free cells, is normally undesirable due to the appearance of cells in the product stream and clogging of such systems. Antibiotics could be used to arrest such free cell growth, while allowing the synthesis and excretion of the product into the medium. Chloramphenicol at 200 μg ml-1 effectively arrests free cell growth and hence the L-lysine being produced can be entirely attributed to the immobilized cells. Novobiocine, on the other hand, at concentration of 100 μg ml-1, stopped free cell growth, but also prevented the production of L-lysine. Productivity and yields of L-lysine were adversely affected by chloramphenicol and novobiocin probably due to a great decrease in cell viability (Israilides et al., 1989). A new route for large-scale production of L-lysine is from methanol (CH3OH) using auxotrophic mutant of the thermotolerent Bacillus methianolicus. Schendel et al. (1990) isolated a gram positive, endospore-forming methylotrophs that grew rapidly on methanol at 60 °C and did not sporulate readily at temperature above 50 °C, developed homoserine auxotrophs and AEC resistance and were capable of secreting nearly 20 g L-1 L-lysine in feed batch fermentation.
Recently, a simulation was developed based on the experimental data obtained in 14 L reactor to predict the growth and L-lysine accumulation. Grace et al. (1996) reported the development of a useful model that can be applied to choose the most beneficial volume control strategy for the optimization of L-lysine accumulation by mutant of Bacillus methanolicus. Based on data obtained in a 14-L-system, a three-phase approach was used to predict the rate of change of culture volume based on CO2 production and methanol consumption. The model was used for the evaluation of volume control strategies to optimize L-lysine productivity at constant volume reactor process, with variable feeding and continuous removal of broth and cell resulted in higher L-lysine productivity, than a feed batch process with out volume control. 0.141 g of L-lysine was produced per gram of methanol. Shah et al. (2002) improved the microbial production of L-lysine by developing a new auxotrophic mutant strain of Cortnebacterium glutamicum.
Kubota et al. (1970) produced auxotrophic mutant strains of B. lactofermentum No. 2256-213, which required threonine, isoleucine and valine for their growth by ultraviolet radiation and cultured them on an otherwise conventional medium using glucose. The amount of L-lysine produced was as highly as 5.2 gram dL-1. Nakayama et al. (1973) also obtained a mutant strain of B. flavum LT-1 ATCC 21258. This was used as the seed strain. Culturing was carried out under the same conditions as described, except that 200 μg L-1 of threonine was added to the seed culture medium and the fermentation medium. After the completion of culturing, 25 mg ml-1 of L-lysine was found to be accumulated in the culture liquor). When the threonine-requiring strain B. flavum ATCCC 2129 was used and was cultured in a similar manner as a control, only 17 mg ml-1 of L-lysine was formed in the culture liquor. The condition of L-lysine continuous biosynthesis was studied by Pilat and Paleckora (1982) using the suppresser mutants Brevibacterium sp. CCM AO 6 / 79. The highest yields were achieved using the two stage continuous culture with the semicontinuous regime in the second stage. When compared with batch culture the production of L-lysine was increased roughly by 70%. Beker (1982) developed threonine, methionine double auxotrophic mutant of Brevibacterium flavum, which required biotin. He found that at low concentration of biotin biosynthesis of glutamic acid takes place; and intensive synthesis of L-lysine can be observed at the beginning of the stationary phase of growth. Certain concentrations of threonine and L-lysine act as enzyme inhibitors. Glucose, the basic carbon source, at concentration higher than 5% has a repressive effect.
Young and Chipley (1983) studied microbial production of L-lysine and threonine from whey permeate by using Brevibacterium lactofermentum ATTCC 21086 and E. coli ATCC 21151. The highest amount of L-lysine 3.3 g L-1 was produced from a mixture of acid hydrolyzed whey permeate and yeast extract (0.2%). Tosaka et al. (1979 a, b) investigated the effect of biotin levels on L-lysine formation in B. lactofermentum. They reported that accumulation of L-lysine was stimulated considerably by increasing the biotin level. Young and Chipley (1984) investigated the role of biotin in L-lysine production by B. lactofermentum ATCC 21086 in acid-hydrolyzed whey permeate medium with and without biotin. Biotin stimulated L-lysine production and growth of B. lactofermentum and 5 μg / biotin per 100 ml was the optimum level. Zaki et al. (1987) worked on the effect of non-ionic detergents and vitamin on the production of amino acids by B. ammoniagenes. They found that the presence of 20μg L-1 biotin induced the production of about 166 mg % L-lysine and 105 mg % arginine. In the presence of 100-400 mg % sodium oleate, 100-169 mg % L-lysine was produced but less amount of L-lysine was produced in the presence of Tween 20 and 80.
According to Nomura et al. (1987) B. flavum QL-5, aspartate kinase was sensitive to feed back inhibition in the simultaneous presence of L-lysine and L-threonine. The simultaneous addition of these two amino acids (1mM each) produced about 60% inhibition. The inhibition was reduced to about 40% by dialysis. Similarly, in L-lysine production by resting cells, the simultaneous addition of these two amino acids (1mM each) produced 35% inhibition and dialysis reduced the inhibition to 12%. In dialysis cultures the lag-phase was shortened and cell mass increased, as compared to non dialysis culture. Moreover, in dialysis cultures, L-lysine was produced earlier and the maximum productivity of L-lysine (1.50 g L-1) was obtained in 6 through 10 hrs cultivation. Yokota and Shiio (1988), studied the effect of reduced citrate synthetase activity and feedback resistant phosphoenol pyruvate carboxylase on L-lysine productivities. Aspartokinase and S-2 aminoethyl cystein (AEC) resistant mutant plus threonine auxotroph of B. flavum was found to produced more than 40 gL-1 of L-lysine as its HCl salt in the medium containing 10 % glucose. In particular, strain No. 664-7 with normally active and completely feed back resistant. AK produced 45g L-1 of L-lysine, HCl. A homoserine dehydrogenase-defective mutant (HD), H-3-4, with low level citrate synthetase and phosphoenol pyruvate carboxylase character also showed higher L-lysine productivity, 41 g / L, than the HD mutant, H1013, which was derived directly from the wild strain. Thus it was concluded that the low level citrate synthetase and phosphoenol pyruvate carboxylase character were effective for the enhancement of the L-lysine productivities of both aspartokinase resistant and HD type producers. Smekal et al. (1988) studied the control of L-lysine biosynthesis with chromogene mutants of Brevibacterium Species M-27. They found 43 to 49 g L-lysine per liter in 96 hours with conversion of 45 to 49%.
Effect of exogenous betaine on the growth of an L-lysine producing mutant of B. lactofermentum was examined by Kawashara et al. (1990a) in a medium containing different carbon sources such as glucose, fructose or sucrose. The growth rate decreased significantly with a rise in temperature when sucrose was the carbon source. Both the specific sucrose consumption rate and the invertase activity of the mutant decreased with the culture period when the cultivation temperature was 35 °C. The addition of betaine restored both growth and invertase activity on medium containing sucrose as the carbon source at 35 °C. Betaine protected the invertase activity against the inactivity effects of high temp in vitro. Furthermore, the addition of exogenous invertase into the production medium at 35 °C restored the growth rate to that at 35 °C. Kawashara et al. (1990b) studied the effect of glycine betaine on growth of B. lactofermentum during L-lysine production and found that it stimulated growth rate in minimal medium, especially in culture medium of inhibitory osmotic stress. Wang et al. (1991) examined the culture conditions for production of L-lysine by Brevibacterium sp. P1-13. The optimal concentration of initial sugar for molasses and raw sugar media were 9 and 16%, respectively. For obtaining high yield of L-lysine, it was necessary to maintain 2% (NH4)2SO4 in medium throughout fermentation and it was also very effective to increase oxygen supply during fermentation. Under optimal condition, 7.35% of L-lysine HCl was accumulated from molasses medium with product yield of 36% in 96-hour fermentation.
The effect of synthetic carbohydrate (SC) on L-lysine biosynthesis by B.
flavum 22L cells was studied by Sukharevich et al. (1992). The said
strains were grown in a medium containing molasses, protein-vitamin hydrolyzate
and mineral salt supplemented with SC. An 11-17% increase in L-lysine concentration
was obtained in a medium supplemented with 0.05% SC and found that the enhancement
of L-lysine biosynthesis by SC was not associated with any effect on the TCA
cycle. Enzymes cultivation of B. flavum 22L in media containing SC and
glycosidase resulted in an 18 and 16% increase in L-lysine yield, respectively.
Brevibacterium sp. 221, which is resistant to ketobutric acid,
are capable of producing L-lysine. (Anonymous, 1992 a, b). Shiio et al.
(1993) isolated α-ketobutyrate (α-KB) resistant mutant of B. flavum
with aspartate kinase desensitized to feed back inhibition by nitrosoguanidine
treatment observed to produce 29.4 to 41.9g L-1 L-lysine.
Trifonova et al. (1993) studied the possible application of various types of fruit and vegetable raw materials to microbial synthesis of L-lysine. They used Brevibacterium sp. and found that substrates high in carbohydrates gave higher L-lysine level than low carbohydrate substrates The highest L-lysine yield on single substrate was obtained with sugar beet (8.4 g carbohydrate 100 ml-1) and gave 25.9 g L-1 L-lysine. Arutyunyan et al. (1993) added mixture of phases to the seed material before culturing the L-lysine producing Brevibacterium in final concentration of the phase in the fermentation was 200 particles ml-1. They found that the phases prevented L-lysine losses if the nutrient media was infected with Proteus sp.
Liu and Wu (1994) used a recirculation loop to investigate the fermentation of L-lysine production by regulatory mutant of B. flavum with the recirculation. Overchenko et al. (1996) noted effective biosynthesis of L-lysine during culture of the auxotrophic strain of Brevibacterium sp. E531 in fruit and vegetable media, using Chinese cabbage juice.
Nakayama et al. (1973), obtained a mutant strain of Corynebacterium glutamicum. Only 34.5mg ml-1 of L-lysine was formed in the fermentation liquor when a homoserine and leucine requiring strain of C. glutamicum (ATCC21253) was used. When culturing was carried out in a fermentation medium into which 500 μg ml-1 of L-threonine has been added, 32.5 mg ml-1 of L-lysine was formed with C. glutamicum BL-25 ATCC 21526. Nakayama et al. (1973) obtained C. glutamicum RL-9 ATCC 21543, T-135 ATCC 21527 and LY-32-6 ATCC 21544. The amounts of L-lysine formed were, 39.4, 38.2 and 38.1 mg ml-1, respectively.
Production of L-lysine was followed in two L-lysine accumulating mutants of C. glutamicum ATCC 13287 in media containing sucrose, ethanol, acetic acid, or a mixture of acetic acid and ammonium or sodium acetate. Pelechova et al. (1981) found that acetate was the best substitution for sucrose. Zaki et al. (1982) reported the effect of tetracycline and erythromycin on the fermentation production of L-lysine. They found that some 22 to 24 g L-1 L-lysine could be produced by Micrococcus glutamicum, when tetracycline and etheryromycin were added to the fermentation culture. Smekel et al. (1982), tested the effect of several types of polar and nonpolar tensides on the biosynthesis of L-lysine using the strain C. glutamicum. Only the definite concentrations of liquid Tween 60 and 80 have a stimulating effect on a production of L-lysine and using the liquid Tween the yield was increased about 10 to 30%.
Production strains of C. glutamicum and Brevibacterium sp. are able to grow and synthesize L-lysine in the fermentation medium with the paper hydrolyzate as the source of monosaccharides. The production of 20-24 g of L-lysine L-1 was achieved in media where hydrolyzate was supplemented with saccharose that permitted the sufficient growth with the simultaneous initiation of the production of L-lysine (Pelechova et al., 1983). The production of L-lysine with the strain of B. flavum and C. glutamicum, using saccharose technology and non standard nitrogen sources such as hydrolysates of extracted rap, flax and cotton plant crush and hydrolysates of fodder yeast, was studied by Smekel et al. (1982). Using these N-sources the production in a range from 36 to 45 g L-lysine per liter was achieved. Smekal (1983) studied the same strain of C. glutamicum 10-20/60, which needed homoserine for growth. The accumulation with standard carbon sources (acetic acid, hydrolysates of cereal starch, mixture of molasses-acetate and enzyme hydrolysis of paper) produced 36-44g L-1 lysine.
The influence of temperature on the growth and L-lysine formation in C.
glutamicum 9366 was studied by Hilliger et al. (1984). The optimum
temperature for both, the biomass yield and product formation was found to be
29 °C. At the temperature above 29°C biomass yield and L-lysine excretion
decreased. Smekel et al. (1984) studied the biosynthesis of L-lysine
in C. glutamicum and B. flavum using media with a hydrolyzate
of phosphocarpus flour, with a yield of 44 and 30 g L-1, respectively.
Smekal et al. (1985) achieved 36 g of L-lysine per liter of the medium
containing saccharose and non-standard nitrogen sources such as hydrolyzate
of rap, flax and cotton. Plachys and Ulbert (1985), isolated chlorolysine resistant
mutant of C. glutamicum, which produced 45 g L-1 L-lysine
after 4 days cultivation in 20 L fermenter.
The effect of threonine and methionine on the culture growth and L-lysine production
was studied by Zaitseva and Konovalova (1986), using four homoserine dependent
mutants viz., C. glutamicum 95 and Brevibacterium sp. 22l (sensitive)
and C. glutamicum 1020-60 and 410-6 (resistant). The L-lysine accumulation
was proportional to the threonine content. The high L-lysine producing strains
were not particularly good consumers of glucose. Tosaka et al. (1983),
however, demonstrated that a high L-lysine producer, high-glucose-consumer could
be produced from fusion of a high-L-lysine, low glucose strain with a low L-lysine,
highly glucose strain.
Hadj-Sassi et al. (1988), reported the influence of initial concentration of glucose from 60 to 233 g L-1 on the production of L-lysine by Corynebacterium sp. in batch and feed batch culture. The maximum conversion rate into L-lysine was obtained at 165 g L-1 and the best specific production rate of L-lysine was observed at 65 g L-1 of glucose. Sobotkova et al. (1989) isolated multiple auxotrophic, regulatory and penicillin resistant mutants from a β- galactosidase-hyper producing strain of E. coli K12. These mutants exhibited, for the most part, a high reversion rate. Wam et al. (1991) isolated DAPA gene (L-2, 3-dihydrodipicolinate synthetase DHDP synthetase) of C. glutamicum JS231, a L-lysine over producer. The DHDP synthetase activity of E. coli TFI, carrying PSHDP5812, showed high resistance towards inhibition by L-lysine.
Pham et al. (1989) studied the microbial production of L-lysine using sugar cane juice, enriched with coconut water (an industrial waste product) by a homoserine auxotroph 9NG7, derived from C. glutamicum ATTCC 13032. The L-lysine yield increased 1.5 fold to 16.9 g L-1 when sugarcane juice enriched with coconut water was used.
Hilliger and Prauser (1989) screened a number of bacteria not reported to produce L-lysine. Twenty-five Coryneform and Nocardioform bacteria were selected with this property. Of these many Oerskonia strains were secreting L-lysine. The AEC resistant mutants accumulated upto 10 g L-1 under the same condition. Mankel et al. (1989), studied the utilization of fumarate by recombinant strain of C. glutamicum. They reported that upon addition of fumarate to a strain with a feedback resistant aspartate kinase, the L-lysine yield increased from 20 to 30 mM. Hadj-Sassi et al. (1990), grew the mutant strain of C. glutamicum in a medium containing 17.5% glucose, 5.5% ammonium sulphate and 2% yeast extract. Under laboratory conditions, it produced high amounts of L-lysine in this optimized medium. A new C. glutamicum strain CS-755 has been claimed, capable of producing L-lysine (Anonymous, 1990).
Hirao et al. (1990) studied L-lysine production in continuous culture
with a single stage cultivation process using the L-lysine hyper producing mutant
B-6 of C. glutamicum. Strain B-6 showed stable L-lysine production for
over 500 hours. The maximum values of L-lysine concentration and volumetric
productivity were 105 g L-1 and 5.6 g L-1 hr-1,
respectively. Coello et al. (1992) worked on the physiological aspect
of L-lysine production. They observed that in case C. glutamicum, phosphate
limited cultures at low growth rates were favourable to L-lysine production.
Konicek et al. (1991) studied the effect of Tween 80 and dimethyl sulfoxide
on biosynthesis of L-lysine in regulatory mutants of C. glutamicum. They
observed that by using dimethyl sulfoxide or Tween 80 the production of L-lysine
was increased by 20-28% and 23-25%, respectively. The stimulation observed is
supposed to be caused by influencing cellular surface structure.
A thermophilic mutant strain of C. thermoaminogenes produced 3.2 g L-1 L-lysine using conventional C, N and mineral sources (Anonymous, 1992e). Moszezyensky et al. (1991) studied immobilized C. glutamicum for L-lysine production and observed 10 fold less L-lysine yield than that of free cells. This was probably due to oxygen transfer limitations. Ferreira and Duarte (1991) isolated fluoro-acetate sensitive mutant of C. glutamicum following mutagenesis with nitrosoguanidine having a maximum yield of 1.3 g L-1.
Zhou et al. (1991) obtained the fusion strain 24413, which used sugar
beet molasses with high output of above 6.5% L-lysine through the protoplast
fusion between B. subtilis BR151 and C. perkinense 1134 derivatives.
Mutant strain of Corynebacterium and Brevibacterium, which are
resistant against reverse coupling inhibition by 2-azido-epsilon caprolactum,
produced L-lysine in higher yields than those produced by microorganisms obtained
by selection with previously used compound such as flouro or chloro-caprolactum.
The efficiency in selecting the mutants is higher with 2-azido-epsilon caprolactum
(Anonymous, 1992c). Selenalysine resistant mutants of C. glutamicum, B. lactofermentum
and C.acetoacidophilum have been developed, accumulating 2.21 g L-1
L-lysine in the culture broth (Anonymous, 1992d).
L-lysine production by AEC resistant mutant of C. glutamicum using ethanol
as the principal carbon source was 4.6 g L-1 (Anonymous, 1993b).
A method for improving L-lysine secretion by a Coryneform bacterium,
involving induction of L-aspartic acid-β-methyl ester (AME) resistance
has been patented (Anonymous, 1993a). The strain was used for fermentative production
of L-lysine produced 29.9 g L-1 L-lysine. Sander et al. (1994)
expressed E. coli Lys-C gene (AK -111-M4) and the dap-A gene from
C. glutamicum. They encoding L-lysine insensitive forms of AK and DHDPS,
respectively, alone and in combination with the seed rape (Brassica napus)
and observed large increase (as much as 100 times) in the level of free L-lysine.
Kim (1994) developed 4-Azaleucine and rifampicin resistant mutants of C.glutamicum
from a homoserine deficient mutant and observed L-lysine production by feed
Falco et al. (1995) observed that the L-lysine content in the seed of
rap (Brassica napus) wester and soybean plants was increased by circumventing
the normal feed back regulation of enzymes of the biosynthetic pathway; aspartate
kinase and DHDPS. Expression of Corynebacterium DHDPS resulted in more
than 100-fold increase in free L-lysine accumulation in rap seeds; Total seed
L-lysine content approximately doubled. Hadj-Sassi et al. (1996) studied
the effect of O2, CO2 and redox potential on L-lysine
production biomass formation and substrate consumption for C. glutamicum
ATTCC 21513 and found that O2 limitation caused a decrease in substrate
consumption rate and conversion efficiency of substrate to L-lysine. The maximum
conversion rate into L-lysine was obtained at 30-35% dissolved O2
saturation without CO2 addition and a redox potential of 440 mv.
Sambanthamurthi et al. (1984) developed a homoserine auxotrophic mutant
of Pseudomonas aeroginosa PAC35. They examine that in minimal salt medium,
with growth limiting concentration of homoserine, excreted L-lysine into the
medium and this did not occur when oxygenous homoserine, or threonine, was in
excess of requirements.
Kikuchi et al. (1996) claimed a new L-lysine decorboxylase of E. coli W 3110 and the DNA sequences, leading to high expression of L-lysine. Sergeichuk et al. (1995) examined that Staphylococcus sp. and Micrococcal strains completely consumed L-lysine in the culture medium. Thus affected the level of L-lysine accumulation in the culture medium. Smirnov et al. (1994) isolated Azomonas sp. from culture broth at different stages of fermentation during L-lysine production and found that this bacteria were not fastidious for culture conditions, grew rapidly, consumed a broad range of carbohydrate and actively produced extracellular slim protein-poly saccharide. They actively consumed the surrounding amino acids thus were dangerous contaminants of biotechnological process.
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