About: Protein K (porin)

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Proteinase K has a catalytic triad of Ser 224, His 69, and Asp 39. Two peptide chains recognize substrates, 99-104 and 132–136. There is also a cysteine free near His 69.(This article is about the bacterial porin. For the nucleic-acid binding protein in eukaryotes, see Protein K (gene expression).) The strains in which protein K has been identified are encapsulated, or surrounded by a poly-sialic acid capsule that renders them more resistant to phagocytosis by cells in the immune system.

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  • Proteinase K has a catalytic triad of Ser 224, His 69, and Asp 39. Two peptide chains recognize substrates, 99-104 and 132–136. There is also a cysteine free near His 69.(This article is about the bacterial porin. For the nucleic-acid binding protein in eukaryotes, see Protein K (gene expression).) Protein K is a porin expressed in some pathogenic strains of E. coli bacteria. It has a molecular weight of about 40 kDa and is localized to the outer membrane, through which it allows both inorganic and organic ions to pass. The addition of Protein K in the outer membrane proven to cause an increased rate of uptake of nutrients and a faster growth rate relative to the parental porin- strain. The strains in which protein K has been identified are encapsulated, or surrounded by a poly-sialic acid capsule that renders them more resistant to phagocytosis by cells in the immune system. (en)
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  • Proteinase K has a catalytic triad of Ser 224, His 69, and Asp 39. Two peptide chains recognize substrates, 99-104 and 132–136. There is also a cysteine free near His 69.(This article is about the bacterial porin. For the nucleic-acid binding protein in eukaryotes, see Protein K (gene expression).) The strains in which protein K has been identified are encapsulated, or surrounded by a poly-sialic acid capsule that renders them more resistant to phagocytosis by cells in the immune system. (en)
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  • Protein K (porin) (en)
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