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A study of human furin specificity using synthetic peptides derived from natural substrates, and effects of potassium ions.

Abstract：

:We explored furin substrate requirements in addition to the motif R-X-K/R-R using synthetic fluorescent resonance energy transfer (FRET) decapeptides. These decapeptides were derived from furin cleavage sites in viral coat glycoproteins and human and bacterial protein precursors. The hydrolysis by furin of most substrate was activated by K(+) ion, whereas kosmotropic anions of the Hofmeister series were inhibitors. The analysis of furin hydrolytic activity showed that its efficiency is highly dependent on the particular combinations of amino acids at different substrate positions. There is a clear interdependence of furin subsites that must be taken in account in determining its specificity and also for the design of inhibitors. However, clear preferences were detected for substrates with S at P(1)', and V at P(2)', at P(3)' the amino acids D, S, L and A are almost equally frequent. In the non-prime subsites the best substrates presented S and H at P(6); basic amino acids at P(5); and no clear tendency at P(3). Interestingly, two amino acid substitutions on the prime side of the peptide derived from H5N1 influenza hemagglutinin furin processing site highly improved its hydrolysis. These modifications are possible by single point mutations, suggesting a potential yield of a more infectious virus.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Izidoro MA,Gouvea IE,Santos JA,Assis DM,Oliveira V,Judice WA,Juliano MA,Lindberg I,Juliano L

doi

10.1016/j.abb.2009.05.013

subject

Has Abstract

pub_date

2009-07-15 00:00:00

pages

105-14

issue

2

eissn

0003-9861

issn

1096-0384

pii

S0003-9861(09)00159-3

journal_volume

487

pub_type

杂志文章

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