Tomonaga Y, Kaneko R, Goto M, Ohshima T, Yoshimune K. Structural insight into activation of homoserine dehydrogenase from the archaeon
Sulfolobus tokodaii via reduction.
Biochem Biophys Rep 2015;
3:14-17. [PMID:
29124164 PMCID:
PMC5668673 DOI:
10.1016/j.bbrep.2015.07.006]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Revised: 07/13/2015] [Accepted: 07/13/2015] [Indexed: 10/27/2022] Open
Abstract
Homoserine dehydrogenase (HSD; 305 amino acid residues) catalyzes an NAD(P)-dependent reversible reaction between l-homoserine and aspartate 4-semialdehyde and is involved in the aspartate pathway. HSD from the hyperthermophilic archaeon Sulfolobus tokodaii was markedly activated (2.5-fold) by the addition of 0.8 mM dithiothreitol. The crystal structure of the homodimer indicated that the activation was caused by cleavage of the disulfide bond formed between two cysteine residues (C303) in the C-terminal regions of the two subunits.
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