Identification of factor XIIIA-reactive glutamine acceptor and lysine donor sites within fibronectin-binding protein (FnbA) from Staphylococcus aureus.

Abstract:

:Staphylococcal fibronectin-binding protein (FnbA) is a surface-associated receptor responsible for the reversible binding of bacteria to human fibronectin and fibrin(ogen). Recently we have shown that FnbA serves as a substrate for coagulation factor XIIIa and undergoes covalent cross-linking to its ligands, resulting in the formation of heteropolymers (Matsuka, Y. V., Anderson, E. T., Milner-Fish, T., Ooi, P., and Baker, S. (2003) Staphylococcus aureus fibronectin-binding protein serves as a substrate for coagulation factor XIIIa: Evidence for factor XIIIa-catalyzed covalent cross-linking to fibronectin and fibrin, Biochemistry 42, 14643-14652). Factor XIIIa also catalyzes the incorporation in FnbA of fluorescent probes dansylcadaverine and glutamine-containing synthetic peptide patterned on the NH(2)-terminal segment of fibronectin. In this study, the above probes were utilized for site-specific labeling and identification of reactive Gln and Lys residues targeted by factor XIIIa in rFnbA. Probe-decorated rFnbA samples were subjected to trypsin or Glu-C digestion, followed by separation of labeled peptides using reversed phase HPLC. Sequencing and mass spectral analyses of isolated probe-modified peptides have been employed for the identification of factor XIIIa-reactive Gln and Lys residues. Analysis of dansylcadaverine-labeled peptides resulted in the identification of one major, Gln103, and three minor, Gln105, Gln783, and Gln830, amine acceptor sites. The labeling procedure with dansyl-PGGQQIV probe revealed that Lys157, Lys503, Lys620, and Lys762 serve as amine donor sites. The identified reactive glutamine acceptor and lysine donor sites of FnbA may participate in transglutaminase-mediated cross-linking reactions resulting in the covalent attachment of pathogenic Staphylococcus aureus to human host proteins.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Anderson ET,Fletcher L,Severin A,Murphy E,Baker SM,Matsuka YV

doi

10.1021/bi049278k

subject

Has Abstract

pub_date

2004-09-21 00:00:00

pages

11842-52

issue

37

eissn

0006-2960

issn

1520-4995

journal_volume

43

pub_type

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