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BMC Microbiol ; 8: 75, 2008 May 15.
Artículo en Inglés | MEDLINE | ID: mdl-18482453

RESUMEN

BACKGROUND: The histone-like Hlp protein is emerging as a key component in mycobacterial pathogenesis, being involved in the initial events of host colonization by interacting with laminin and glycosaminoglycans (GAGs). In the present study, nuclear magnetic resonance (NMR) was used to map the binding site(s) of Hlp to heparan sulfate and identify the nature of the amino acid residues directly involved in this interaction. RESULTS: The capacity of a panel of 30 mer synthetic peptides covering the full length of Hlp to bind to heparin/heparan sulfate was analyzed by solid phase assays, NMR, and affinity chromatography. An additional active region between the residues Gly46 and Ala60 was defined at the N-terminal domain of Hlp, expanding the previously defined heparin-binding site between Thr31 and Phe50. Additionally, the C-terminus, rich in Lys residues, was confirmed as another heparan sulfate binding region. The amino acids in Hlp identified as mediators in the interaction with heparan sulfate were Arg, Val, Ile, Lys, Phe, and Thr. CONCLUSION: Our data indicate that Hlp interacts with heparan sulfate through two distinct regions of the protein. Both heparan sulfate-binding regions here defined are preserved in all mycobacterial Hlp homologues that have been sequenced, suggesting important but possibly divergent roles for this surface-exposed protein in both pathogenic and saprophic species.


Asunto(s)
Adhesinas Bacterianas/química , Heparina/metabolismo , Heparitina Sulfato/metabolismo , Mycobacterium leprae/química , Secuencia de Aminoácidos , Sitios de Unión , Cromatografía de Afinidad , Espectroscopía de Resonancia Magnética , Datos de Secuencia Molecular , Unión Proteica , Estructura Terciaria de Proteína , Proteínas Recombinantes/química , Sefarosa/análogos & derivados , Sefarosa/metabolismo , Cloruro de Sodio/metabolismo
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