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Members of this family are small (28 kDa) surface exposed proteins found in Borrelia. They exhibit channel activity, which indicates their role as porins. However, prediction methods do not corroborate to a large ß sheet content, a fact that may indicates the multimeric nature of the presumable ß-barrel. Recent contradicting evidence though suggest that Oms28 could be a periplasmic outer membrane-associated protein.
Borrelia burgdorferi BBA74, a periplasmic protein associated with the outer membrane, lacks porin-like properties
J Bacteriol. 2007 Mar;189(5):2063-8. doi: 10.1128/JB.01239-06. Epub 2006 Dec 22.
Porin activity of the native and recombinant outer membrane protein Oms28 of Borrelia burgdorferi
J Bacteriol. 1996 Aug;178(16):4909-18. doi: 10.1128/jb.178.16.4909-4918.1996.