Crystal structure of phosphoserine aminotransferase from Escherichia coli at 2.3 A resolution: comparison of the unligated enzyme and a complex with alpha-methyl-l-glutamate.Hester, G., Stark, W., Moser, M., Kallen, J., Markovic-Housley, Z., Jansonius, J.N.
(1999) J.Mol.Biol. 286: 829-850
- PubMed: 10024454
- DOI: 10.1006/jmbi.1998.2506
- Primary Citation of Related Structures:
- PubMed Abstract:
- Crystallographic and Solution Studies on Phosphoserine Aminotransferase (Psat) from E. Coli
Kallen, J.,Kania, M.,Markovic-Housley, Z.,Vincent, M.G.,Jansonius, J.N.
(1987) Biochemistry of Vitamin B6: Proceedings of the 7Th International Congress on Chemical and Biological Aspects of Vitamin B6 Catalysis (in: Iub Symp. Ser., V.166) --: 157
- The Three Dimensional Structure of Phosphoserine Aminotransferase from Escherichia Coli
Stark, W.,Kallen, J.,Markovic-Housley, Z.,Fol, B.,Kania, M.,Jansonius, J.N.
(1991) Enzymes Dependent on Pyridoxal Phosphate and Other Carbonyl Compounds as Cofactors: Proceedings of the 8Th International Symposium on Vitamin B6 and Carbonyl Catalysis --: 111
Phosphoserine aminotransferase (PSAT; EC 220.127.116.11), a member of subgroup IV of the aminotransferases, catalyses the conversion of 3-phosphohydroxypyruvate to l-phosphoserine. The crystal structure of PSAT from Escherichia coli has been solved in spac ...
Phosphoserine aminotransferase (PSAT; EC 18.104.22.168), a member of subgroup IV of the aminotransferases, catalyses the conversion of 3-phosphohydroxypyruvate to l-phosphoserine. The crystal structure of PSAT from Escherichia coli has been solved in space group P212121 using MIRAS phases in combination with density modification and was refined to an R-factor of 17.5% (Rfree=20.1 %) at 2.3 A resolution. In addition, the structure of PSAT in complex with alpha-methyl-l-glutamate (AMG) has been refined to an R-factor of 18.5% (Rfree=25.1%) at 2.8 A resolution. Each subunit (361 residues) of the PSAT homodimer is composed of a large pyridoxal-5'-phosphate binding domain (residues 16-268), consisting of a seven-stranded mainly parallel beta-sheet, two additional beta-strands and seven alpha-helices, and a small C-terminal domain, which incorporates a five-stranded beta-sheet and two alpha-helices. A three-dimensional structural comparison to four other vitamin B6-dependent enzymes reveals that three alpha-helices of the large domain, as well as an N-terminal domain (subgroup II) or subdomain (subgroup I) are absent in PSAT. Its only 15 N-terminal residues form a single beta-strand, which participates in the beta-sheet of the C-terminal domain. The cofactor is bound through an aldimine linkage to Lys198 in the active site. In the PSAT-AMG complex Ser9 and Arg335 bind the AMG alpha-carboxylate group while His41, Arg42 and His328 are involved in binding the AMG side-chain. Arg77 binds the AMG side-chain indirectly through a solvent molecule and is expected to position itself during catalysis between the PLP phosphate group and the substrate side-chain. Comparison of the active sites of PSAT and aspartate aminotransferase suggests a similar catalytic mechanism, except for the transaldimination step, since in PSAT the Schiff base is protonated. Correlation of the PSAT crystal structure to a published profile sequence analysis of all subgroup IV members allows active site modelling of nifs and the proposal of a likely molecular reaction mechanism.
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