Crystal structure of a chimaeric bacterial glutamate dehydrogenase

Tânia Oliveira, Michael A. Sharkey, Paul C. Engel, Amir R. Khan

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Glutamate dehydrogenases (EC 1.4.1.2-4) catalyse the oxidative deamination of l-glutamate to α-ketoglutarate using NAD(P)+ as a cofactor. The bacterial enzymes are hexameric, arranged with 32 symmetry, and each polypeptide consists of an N-terminal substrate-binding segment (domain I) followed by a C-terminal cofactor-binding segment (domain II). The catalytic reaction takes place in the cleft formed at the junction of the two domains. Distinct signature sequences in the nucleotide-binding domain have been linked to the binding of NAD+ versus NADP+, but they are not unambiguous predictors of cofactor preference. In the absence of substrate, the two domains move apart as rigid bodies, as shown by the apo structure of glutamate dehydrogenase from Clostridium symbiosum. Here, the crystal structure of a chimaeric clostridial/Escherichia coli enzyme has been determined in the apo state. The enzyme is fully functional and reveals possible determinants of interdomain flexibility at a hinge region following the pivot helix. The enzyme retains the preference for NADP+ cofactor from the parent E. coli domain II, although there are subtle differences in catalytic activity.

Original languageEnglish
Pages (from-to)462-466
Number of pages5
JournalActa Crystallographica Section F:Structural Biology Communications
Volume72
DOIs
Publication statusPublished - 2016

Keywords

  • catalysis
  • chimaera
  • enzyme
  • glutamate dehydrogenase
  • NADP-binding domain

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