3zgi
From Proteopedia
Crystal structure of the KRT10-binding region domain of the pneumococcal serine rich repeat protein PsrP
Structural highlights
FunctionPSRP_STRPN Protein that allows bacteria to adhere to mammalian host cells. Required for full virulence in mouse infection models when infected intranasally (PubMed:16861665). Required for adhesion to host cells in vitro and for persistence in the lower respiratory tract (PubMed:18507531). Binds host keratin 10 (KRT10) on lung cells which mediates adhesion via the C-terminus of the basic region (BR, residues 273-341); glycosylation of either protein is not required for the interaction (PubMed:19627498). A region in the N-terminus (residues 122-166) self aggregates, contributing to mature biofilm formation (PubMed:20714350). The basic region (BR, residues 187-385) also self aggregates; the BR binds DNA which enhances self aggregation (PubMed:27582320).[1] [2] [3] [4] [5] Publication Abstract from PubMedStreptococcus pneumoniae is a major human pathogen, and a leading cause of disease and death worldwide. Pneumococcal invasive disease is triggered by initial asymptomatic colonization of the human upper respiratory tract. The pneumococcal serine-rich repeat protein (PsrP) is a lung-specific virulence factor whose functional binding region (BR) binds to keratin-10 (KRT10) and promotes pneumococcal biofilm formation through self-oligomerization. We present the crystal structure of the KRT10-binding domain of PsrP (BR187-385) determined to 2.0 A resolution. BR187-385 adopts a novel variant of the DEv-IgG fold, typical for microbial surface components recognizing adhesive matrix molecules adhesins, despite very low sequence identity. An extended beta-sheet on one side of the compressed, two-sided barrel presents a basic groove that possibly binds to the acidic helical rod domain of KRT10. Our study also demonstrates the importance of the other side of the barrel, formed by extensive well-ordered loops and stabilized by short beta-strands, for interaction with KRT10. The basic keratin 10-binding domain of the virulence-associated pneumococcal serine-rich protein PsrP adopts a novel MSCRAMM fold.,Schulte T, Lofling J, Mikaelsson C, Kikhney A, Hentrich K, Diamante A, Ebel C, Normark S, Svergun D, Henriques-Normark B, Achour A Open Biol. 2014 Jan 15;4(1):130090. doi: 10.1098/rsob.130090. PMID:24430336[6] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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