Ternary Complex Of Glycerol 3-phosphate Dehydrogenase 1 with NAD and dihydroxyactone
[GPDA_HUMAN] Defects in GPD1 are a cause of hypertriglyceridemia, transient infantile (HTGTI) [MIM:614480]. An autosomal recessive disorder characterized by onset of moderate to severe transient hypertriglyceridemia in infancy that normalizes with age. The hypertriglyceridemia is associated with hepatomegaly, moderately elevated transaminases, persistent fatty liver, and the development of hepatic fibrosis.
Publication Abstract from PubMed
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.
Crystal structures of human glycerol 3-phosphate dehydrogenase 1 (GPD1).,Ou X, Ji C, Han X, Zhao X, Li X, Mao Y, Wong LL, Bartlam M, Rao Z J Mol Biol. 2006 Mar 31;357(3):858-69. Epub 2006 Jan 18. PMID:16460752
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.