Purification and Partial Characterization of a Protease from Tomato (Lycopersicon esculentum Mill)


	Pakistan Journal of Biological Sciences
	Year: 1999 \| Volume: 2 \| Issue: 3 \| Page No.: 955-959 DOI: 10.3923/pjbs.1999.955.959

Purification and Partial Characterization of a Protease from Tomato (Lycopersicon esculentum Mill)

M.R. Karim, M.A. Islam , N. Absar and F. Hashinaga

Abstract: A protease from tomato flesh was purified to homogeneity by (NH₄)₂SO₄ precipitation followed by Sephadex G-75 and DEAE-cellulose column chromatography. Molecular weight of the enzyme was estimated to be 81-79 KD by gel filtration and SDS-PAGE respectively. The enzyme was found to be a single polypeptide chain as revealed by SDS-PAGE under either reducing or non-reducing conditions. Optimum activity was observed at pH 7.0 and 45°C with a k_m value of 0.48 per cent determined by using casein as substrate. The enzyme appears to be a serine protease being inhibited greatly by DFP and PMSF and to a lesser extent by heavy metals such as Pb²⁺ and Fe²⁺.

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How to cite this article:

M.R. Karim, M.A. Islam , N. Absar and F. Hashinaga , 1999. Purification and Partial Characterization of a Protease from Tomato (Lycopersicon esculentum Mill). Pakistan Journal of Biological Sciences, 2: 955-959.

DOI: 10.3923/pjbs.1999.955.959

URL: https://scialert.net/abstract/?doi=pjbs.1999.955.959

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