The tail nick augments Aeromonas sobria serine protease (ASP) activity in plasma through retarding inhibition by α2-macroglobulin.

Abstract:

:ASP is a serine protease secreted by Aeromonas sobria, a sepsis-causing bacterium, and induces sepsis-mimicking disorders through plasma protein cleavage. The pathogen also secretes nASP that has a nick in the carboxy-terminal region. Compared with single-chain ASP (sASP), nASP had near-equivalent activity for small peptide substrates but was less proteolytic. Surprisingly, nASP cleaved proteins more in plasma and was inhibited by human α(2)-macroglobulin more slowly than sASP. Retarded inhibition by α(2)-macroglobulin allows nASP to keep proteolytic activity for longer in the host and exacerbate disorders at Aeromonas sobria infection sites. nASP may be an evolutional form to augment ASP virulence.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Murakami Y,Wada Y,Kobayashi H,Hasegawa M,Okamoto K,Eto M,Imamura T

doi

10.1016/j.febslet.2012.08.004

subject

Has Abstract

pub_date

2012-10-19 00:00:00

pages

3613-7

issue

20

eissn

0014-5793

issn

1873-3468

pii

S0014-5793(12)00661-8

journal_volume

586

pub_type

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