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Articles by T. Ishida
Total Records ( 2 ) for T. Ishida
  Y Fujita , M Oe , T Tutsumino , S Morino , H Imataka , K Tomoo and T. Ishida
 

The interactions of recombinant human eIF4A (4A) and its N- and C-terminal side domains (AN and AC, respectively) with the middle- and C-terminal-domain-linked fragment (GMC) of eIF4G and its middle and C-terminal domains (GM and GC, respectively) were investigated by surface plasmon resonance (SPR) analysis and isothermal titration calorimetry (ITC). It is remarkable that the kinetic parameter-dependent SPR profile observed for the 4A–GMC pair was quite different from the steady affinity profiles of the 4A–GM/GC pairs, suggesting the simultaneous contribution of the middle and C-terminal domains of eIF4G for the binding with eIF4A. On the other hand, ITC yielded the enthalpy energies of –1.5 x 104 to –2.5 x 104 J/mol for the domain–domain interactions of 4A with GMC. Although the ITC profile of the 4A–GM pair reflects well the structural feature shown previously by NMR and X-ray analyses, it was essentially different from that of the 4A-GMC pair. The present results suggest that the intimate interaction between the eIF4A N- and C-terminal domains and the eIF4G middle and C-terminal domains is necessary to reveal the biologically active function of the eIF4A–eIF4G complex.

  C Nishiura , K Takeuchi , K Minoura , M Sumida , T Taniguchi , K Tomoo and T. Ishida
 

The inhibition of tau fibrillation is a potential therapeutic target for Alzheimer’s and other neurodegenerative diseases. As a series of studies on inhibiting the transition of soluble monomeric tau into mature fibril, the effect of Tyr310 residue in the third repeat (R3) of the microtubule-binding domain (MBD) on the assembly of MBD was investigated using Tyr-substituted MBD mutants by fluorescence, circular dichroism spectroscopy and electron microscopy. Consequently, the importance of the Tyr residue located at position 310, not at other positions, was clearly shown. The conformational comparison of the Tyr310Ala-substituted R3 repeat peptide with the unsubstituted one showed that the Tyr residue contributes to the rigid extended structure of the N-terminal V306QIVYK311 sequence, and its replacement by Ala leads to the deformation of the extended structure, consequently losing its aggregation ability. The present results indicate that a compound that interacts specifically with the Tyr residue or an antibody recognizing the region containing the Tyr residue becomes a candidate for inhibiting tau fibrillation.

 
 
 
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