Characterization of AWAP IV, the C-terminal domain of the avian protein AWAK.

Abstract:

:AWAP IV constitutes the C-terminal domain of the larger 81 kDa protein AWAK [Avian WAP (whey acidic protein) domain- and Kunitz domain-containing], which is predicted, through conserved domain database searching, to contain at least four WAP domains and one Kunitz domain. RT (reverse transcription)-PCR analyses revealed mRNA transcripts encoding AWAP IV in the small intestinal and kidney tissues of 5-day-old Salmonella-infected chicks. Time-kill antimicrobial assays using rAWAP IV (recombinant AWAP IV) cell lysate indicated antimicrobial activity against gram-positive and gram-negative bacteria including Salmonella, Streptococcus and Staphylococcus spp. In addition, permeabilization of the outer membrane of Salmonella, as shown by the NPN (N-phenyl-1-naphthylamine) fluorescent probe assay, supported the ability of rAWAP IV to disrupt prokaryotic membranes. WAP domains can function as inhibitors of serine protease activity, and the microbial serine proteases subtilisin and proteinase K were inhibited by rAWAP IV cell lysate. However, at comparable concentrations, no significant inhibition of the mammalian serine protease elastase was observed. The combined broad-spectrum antibacterial and anti-protease activities of AWAP IV suggest a novel role in the avian innate defence mechanisms operating against microbial infection.

journal_name

Biochem Soc Trans

authors

Townes CL,Milona P,Hall J

doi

10.1042/BST20060267

keywords:

subject

Has Abstract

pub_date

2006-04-01 00:00:00

pages

267-9

issue

Pt 2

eissn

0300-5127

issn

1470-8752

pii

BST20060267

journal_volume

34

pub_type

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