2fsu | pdb_00002fsu
Crystal Structure of the PhnH Protein from Escherichia Coli
Structural highlights
FunctionPHNH_ECOLI Together with PhnG, PhnI and PhnL is required for the transfer of the ribose triphosphate moiety from ATP to methyl phosphonate.[1] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedOrganophosphonates are reduced forms of phosphorous that are characterized by the presence of a stable carbon-phosphorus (C-P) bond, which resists chemical hydrolysis, thermal decomposition, and photolysis. The chemically inert nature of the C-P bond has raised environmental concerns as toxic phosphonates accumulate in a number of ecosystems. Carbon-phosphorous lyase (CP lyase) is a multienzyme pathway encoded by the phn operon in gram-negative bacteria. In Escherichia coli 14 cistrons comprise the operon (phnCDEFGHIJKLMNOP) and collectively allow the internalization and degradation of phosphonates. Here we report the X-ray crystal structure of the PhnH component at 1.77 A resolution. The protein exhibits a novel fold, although local similarities with the pyridoxal 5'-phosphate-dependent transferase family of proteins are apparent. PhnH forms a dimer in solution and in the crystal structure, the interface of which is implicated in creating a potential ligand binding pocket. Our studies further suggest that PhnH may be capable of binding negatively charged cyclic compounds through interaction with strictly conserved residues. Finally, we show that PhnH is essential for C-P bond cleavage in the CP lyase pathway. Crystal structure of PhnH: an essential component of carbon-phosphorus lyase in Escherichia coli.,Adams MA, Luo Y, Hove-Jensen B, He SM, van Staalduinen LM, Zechel DL, Jia Z J Bacteriol. 2008 Feb;190(3):1072-83. Epub 2007 Nov 9. PMID:17993513[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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