Identification of novel serum proteins in a Japanese viper: homologs of mammalian PSP94.

Abstract:

:Three small serum proteins (SSP-1, -2, and -3), with molecular masses of 6.5-10kDa, were isolated from Habu (Trimeresurus flavoviridis) serum, and the amino acid sequences were determined by protein and cDNA analysis. Despite only limited sequence identity to any mammalian prostatic secretory protein of 94 amino acids (PSP94), all of the Cys residues in these SSPs were well conserved. SSPs are the first PSP94 family proteins to be identified in reptiles. SSP-1 and -3 weakly inhibited the proteolytic activity of a snake venom metalloproteinase. On the other hand, SSP-2 formed a tight complex with triflin, a snake venom-derived Ca(2+) channel blocker that suppresses the smooth muscle contraction. This suggests a role for SSP-2 in the self defense system of venomous snakes.

authors

Aoki N,Sakiyama A,Deshimaru M,Terada S

doi

10.1016/j.bbrc.2007.05.091

subject

Has Abstract

pub_date

2007-07-27 00:00:00

pages

330-4

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(07)01057-1

journal_volume

359

pub_type

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