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    Nat Struct Biol. 1998 May;5(5):369-76.

    Structure determination of selenomethionyl S-adenosylhomocysteine hydrolase using data at a single wavelength.

    Turner MA, Yuan CS, Borchardt RT, Hershfield MS, Smith GD, Howell PL.

    Structural Biology and Biochemistry, Research Institute, Hospital for Sick Children, Toronto, Ontario, Canada.

    S-Adenosylhomocysteine (AdoHcy) hydrolase regulates all adenosylmethionine-(AdoMet) dependent transmethylations by hydrolyzing the potent feedback inhibitor AdoHcy to homocysteine and adenosine. The crystallographic structure determination of a selenomethionyl-incorporated AdoHcy hydrolase inhibitor complex was accomplished using single wavelength anomalous diffraction data and the direct methods program, Snb v2.0, which produced the positions of all 30 crystallographically distinct selenium atoms. The mode of enzyme-cofactor binding is unique, requiring interactions from two protein monomers. An unusual dual role for a catalytic water molecule in the active site is revealed in the complex with the adenosine analog 2'-hydroxy, 3'-ketocyclopent-4'-enyladenine.

    PMID: 9586999 [PubMed - indexed for MEDLINE]

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