1h73
|
CRYSTAL STRUCTURE OF HOMOSERINE KINASE COMPLEXED WITH THREONINE
OverviewOverview
Homoserine kinase (HSK), the fourth enzyme in the aspartate pathway of, amino acid biosynthesis, catalyzes the phosphorylation of L-homoserine, (Hse) to L-homoserine phosphate, an intermediate in the production of, L-threonine, L-isoleucine, and in higher plants, L-methionine. The, high-resolution structures of Methanococcus jannaschii HSK ternary, complexes with its amino acid substrate and ATP analogues have been, determined by X-ray crystallography. These structures reveal the, structural determinants of the tight and highly specific binding of Hse, which is coupled with local conformational changes that enforce the, sequestration of the substrate. The delta-hydroxyl group of bound Hse is, only 3.4 A away from the gamma-phosphate of the bound nucleotide, poised, for the in-line attack ... [(full description)]
About this StructureAbout this Structure
1H73 is a [Single protein] structure of sequence from [Methanocaldococcus jannaschii] with THR and ANP as [ligands]. Active as [Homoserine kinase], with EC number [2.7.1.39]. Structure known Active Sites: ANP and THR. Full crystallographic information is available from [OCA].
ReferenceReference
Structural basis for the catalysis and substrate specificity of homoserine kinase., Krishna SS, Zhou T, Daugherty M, Osterman A, Zhang H, Biochemistry. 2001 Sep 11;40(36):10810-8. PMID:11535056
Page seeded by OCA on Tue Oct 30 15:30:56 2007