Crystal structures of human glycerol 3-phosphate dehydrogenase 1 (GPD1).
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Ou X, Ji C, Han X, Zhao X, Li X, Mao Y, Wong LL, Bartlam M, Rao Z
Crystal structures of human glycerol 3-phosphate dehydrogenase 1 (GPD1).
J Mol Biol. 2006 Mar 31;357(3):858-69. Epub 2006 Jan 18.
- PubMed ID
- 16460752 [ View in PubMed]
- Abstract
Homo sapiens L-alpha-glycerol-3-phosphate dehydrogenase 1 (GPD1) catalyzes the reversible biological conversion of dihydroxyacetone (DHAP) to glycerol-3-phosphate. The GPD1 protein was expressed in Escherichia coli, and purified as a fusion protein with glutathione S-transferase. Here we report the apoenzyme structure of GPD1 determined by multiwavelength anomalous diffraction phasing, and other complex structures with small molecules (NAD+ and DHAP) by the molecular replacement method. This enzyme structure is organized into two distinct domains, the N-terminal eight-stranded beta-sheet sandwich domain and the C-terminal helical substrate-binding domain. An electrophilic catalytic mechanism by the epsilon-NH3+ group of Lys204 is proposed on the basis of the structural analyses. In addition, the inhibitory effects of zinc and sulfate on GPDHs are assayed and discussed.