Outer membrane protein OpcA

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Outer membrane protein OpcA
Identifiers
Symbol OpcA
Pfam PF07239
InterPro IPR009876
SCOP 1k24
OPM family 27
OPM protein 1k24
Available PDB structures:

1k24A:2-245

Outer membrane adhesin OpcA protein family consists of several Neisseria species specific outer membrane proteins. Neisseria meningitidis causes meningococcal meningitis and septicemia. Opc (formerly called 5C) is one of the major outer membrane proteins and has been shown to play an important role in meningococcal adhesion and invasion of epithelial and endothelial cells, mediating attachment to host cells by binding proteoglycan cell-surface receptors[1].

OpcA forms a 10-stranded beta-barrel with five highly mobile extracellular loops that protrude above the surface of the membrane[2]. These extracellular loops combine to form a crevice in the external surface that is lined by positively charged residues, which is predicted to be a binding site for proteoglycan polysaccharides involved in pathogenesis. Conformational changes in the extracellular loops modulate the surface of OpcA, which could affect the proteoglycan binding site[3]. These conformational changes could also lead to pore opening.

[edit] References

  1. ^ Zhu P, Klutch MJ, Derrick JP, Prince SM, Tsang RS, Tsai CM (2003). "Identification of opcA gene in Neisseria polysaccharea: interspecies diversity of Opc protein family". Gene 307: 31–40. doi:10.1016/S0378-1119(02)01208-8. PMID 12706886. 
  2. ^ Derrick JP, Prince SM, Achtman M (2002). "Crystal structure of the OpcA integral membrane adhesin from Neisseria meningitidis". Proc. Natl. Acad. Sci. U.S.A. 99 (6): -. PMID 11891340. 
  3. ^ Sansom MS, Derrick JP, Bond PJ (2007). "Membrane simulations of OpcA: gating in the loops?". Biophys. J. 92 (2): -. PMID 17114231. 
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This article includes text from the public domain Pfam and InterPro IPR009876