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General function of N-terminal propeptide on assisting protein folding and inhibiting catalytic activity based on observations with a chimeric thermolysin-like protease.

Abstract : Pro-aminopeptidase processing protease (PA protease) is a thermolysin-like metalloprotease produced by Aeromonas caviae T-64. The N-terminal propeptide acts as an intramolecular chaperone to assist the folding of PA protease and shows inhibitory activity toward its cognate mature enzyme. Moreover, the N-terminal propeptide strongly inhibits the autoprocessing of the C-terminal propeptide by forming a complex with the folded intermediate pro-PA protease containing the C-terminal propeptide (MC). In order to investigate the structural determinants within the N-terminal propeptide that play a role in the folding, processing, and enzyme inhibition of PA protease, we constructed a chimeric pro-PA protease by replacing the N-terminal propeptide with that of vibriolysin, a homologue of PA protease. Our results indicated that, although the N-terminal propeptide of vibriolysin shares only 36% identity with that of PA protease, it assists the refolding of MC, inhibits the folded MC to process its C-terminal propeptide, and shows a stronger inhibitory activity toward the mature PA protease than that of PA protease. These results suggest that the N-terminal propeptide domains in these thermolysin-like proteases may have similar functions, in spite of their primary sequence diversity. In addition, the conserved regions in the N-terminal propeptides of PA protease and vibriolysin may be essential for the functions of the N-terminal propeptide.
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https://www.hal.inserm.fr/inserm-00144798
Contributor : Cynthia Marie-Claire <>
Submitted on : Friday, May 4, 2007 - 5:18:16 PM
Last modification on : Tuesday, September 22, 2020 - 3:58:59 AM
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  • HAL Id : inserm-00144798, version 1
  • PUBMED : 12589825

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Bing Tang, Satoru Nirasawa, Motomitsu Kitaoka, Cynthia Marie-Claire, Kiyoshi Hayashi. General function of N-terminal propeptide on assisting protein folding and inhibiting catalytic activity based on observations with a chimeric thermolysin-like protease.. Biochemical and Biophysical Research Communications, Elsevier, 2003, 301 (4), pp.1093-8. ⟨inserm-00144798⟩

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