NADP+-dependent glutamate dehydrogenase in the Antarctic psychrotolerant bacterium Psychrobacter sp. TAD1. Characterization, protein and DNA sequence, and relationship to other glutamate dehydrogenases. (Articolo in rivista)

Type
Label
  • NADP+-dependent glutamate dehydrogenase in the Antarctic psychrotolerant bacterium Psychrobacter sp. TAD1. Characterization, protein and DNA sequence, and relationship to other glutamate dehydrogenases. (Articolo in rivista) (literal)
Anno
  • 2000-01-01T00:00:00+01:00 (literal)
Alternative label
  • Di Fraia R, Wilquet V, Ciardiello MA, Carratore V, Antignani A, Camardella L, Glansdorff N, di Prisco G. (2000)
    NADP+-dependent glutamate dehydrogenase in the Antarctic psychrotolerant bacterium Psychrobacter sp. TAD1. Characterization, protein and DNA sequence, and relationship to other glutamate dehydrogenases.
    in European journal of biochemistry (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Di Fraia R, Wilquet V, Ciardiello MA, Carratore V, Antignani A, Camardella L, Glansdorff N, di Prisco G. (literal)
Pagina inizio
  • 121 (literal)
Pagina fine
  • 131 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 267 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Inst Prot Biochem & Enzymol, I-80125 Naples, Italy; Free Univ Brussels, Dept Microbiol, B-1050 Brussels, Belgium; Res Inst Jean Marie Wiame, Brussels, Belgium; Flanders Interuniv Inst Biotechnol, Brussels, Belgium (literal)
Titolo
  • NADP+-dependent glutamate dehydrogenase in the Antarctic psychrotolerant bacterium Psychrobacter sp. TAD1. Characterization, protein and DNA sequence, and relationship to other glutamate dehydrogenases. (literal)
Abstract
  • The Antarctic psychrotolerant bacterium Psychrobacter sp. TAD1 contains two distinct glutamate dehydrogenases (GDH), each specific for either NADP+ or NAD+. This feature is quite unusual in bacteria, which generally have a single GDH. NADP+-dependent GDH has been purified to homogeneity and the gene encoding GDH has been cloned and expressed. The enzyme has a hexameric structure. The amino acid sequence determined by peptide and gene analyses comprises 447 residues, yielding a protein with a molecular mass of 49 285 Da. The sequence shows homology with hexameric GDHs, with identity levels of 52% and 49% with Escherichia coli and Clostridium symbiosum GDH, respectively. The coenzyme-binding fingerprint motif GXGXXG/A (common to all GDHs) has Ser at the last position in this enzyme. The overall hydrophilic character is increased and a five-residue insertion in a loop between two alpha-helices may contribute to the increase in protein flexibility. Psychrobacter sp. TAD1 GDH apparent temperature optimum is shifted towards low temperatures, whereas irreversible heat inactivation occurs at temperatures similar to those of E. coli GDH. The catalytic efficiency in the temperature range 10-30 degrees C is similar or lower than that of E. coli GDH. Unlike E. coli GDH the enzyme exhibits marked positive cooperativity towards 2-oxoglutarate and NADPH. This feature is generally absent in prokaryotic GDHs. These observations suggest a regulatory role for this GDH, the most crucial feature being the structural/functional properties required for fine regulation of activity, rather than the high catalytic efficiency and thermolability encountered in several cold-active enzymes. (literal)
Prodotto di
Autore CNR

Incoming links:


Autore CNR di
Prodotto
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi
data.CNR.it