Title : Identification of binding sites of non-I-helix water molecules in mammalian cytochromes p450.

Pub. Date : 2006 Dec

PMID : 16956955






8 Functional Relationships(s)
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1 Identification of binding sites of non-I-helix water molecules in mammalian cytochromes p450. Water cytochrome P450 family 2 subfamily B member 6 Homo sapiens
2 The study of P450-bound waters has been largely restricted to bacterial enzymes that may or may not reflect the location or function of waters in human drug-metabolizing P450s. Water cytochrome P450 family 2 subfamily B member 6 Homo sapiens
3 The study of P450-bound waters has been largely restricted to bacterial enzymes that may or may not reflect the location or function of waters in human drug-metabolizing P450s. Water cytochrome P450 family 2 subfamily B member 6 Homo sapiens
4 Described herein is the identification of seven well defined water clusters in mammalian P450s identified by calculating the density of globally aligned waters as reported by Tanner and coworkers [Bottoms CA, White TA, and Tanner JJ (2006) Proteins 64:404-421 (DOI: 10.1002/prot.21014)]. Water cytochrome P450 family 2 subfamily B member 6 Homo sapiens
5 All water binding sites were in or within the immediate vicinity of the active sites of the P450s, but most were not near the conserved I-helix threonine often implicated in P450 catalysis. Water cytochrome P450 family 2 subfamily B member 6 Homo sapiens
6 All water binding sites were in or within the immediate vicinity of the active sites of the P450s, but most were not near the conserved I-helix threonine often implicated in P450 catalysis. Water cytochrome P450 family 2 subfamily B member 6 Homo sapiens
7 Therefore, it is possible that some of the water binding sites identified here ultimately determine P450 catalytic efficiency either by working as an extension of the I-helix water network, or by acting in novel proton shuttles that modulate the nonproductive shunting of reactive oxygen species. Water cytochrome P450 family 2 subfamily B member 6 Homo sapiens
8 Therefore, it is possible that some of the water binding sites identified here ultimately determine P450 catalytic efficiency either by working as an extension of the I-helix water network, or by acting in novel proton shuttles that modulate the nonproductive shunting of reactive oxygen species. Water cytochrome P450 family 2 subfamily B member 6 Homo sapiens