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Default NMR assignments, secondary structure and hydration of oxidized Escherichia coli flavo

NMR assignments, secondary structure and hydration of oxidized Escherichia coli flavodoxin.

Related Articles NMR assignments, secondary structure and hydration of oxidized Escherichia coli flavodoxin.

Eur J Biochem. 1997 Mar 1;244(2):384-99

Authors: Ponstingl H, Otting G

Recombinant flavodoxin from Escherichia coli was uniformly enriched with 15N and 13C isotopes and its oxidized form in aqueous solution investigated by three-dimensional NMR spectroscopy. Nearly complete 1H, 15N and 13C resonance assignments were obtained. The secondary structure was determined from chemical shift, NOE and 3J(HNH alpha) coupling constant data. Like homologous long-chain flavodoxins, E. coli flavodoxin contains a five-stranded parallel beta-sheet and five helices. The beta-strands were found to comprise the residues 3-8, 29-34, 48-56, 80-89, 114-116 and 141-145. The helices comprise residues 12-25, 40-45, 62-73, 98-108 and 152-166. The FMN-binding site was determined by intermolecular NOEs and low-field shifted amide proton resonances induced by the phosphoester group of the cofactor. The data are in good agreement with a previously predicted model of E. coli flavodoxin [Havel, T. F. (1993) Mol. Sim. 10, 175-210]. The analysis of of water-flavodoxin NOEs revealed the presence of two, possibly three, buried hydration water molecules which are located at sites, where homologous flavodoxins from Anacystis nidulans and Anabena 7120 contain conserved hydration water molecules. One of these water molecules mediates hydrogen bonds between the protein backbone and the ribityl chain of the FMN cofactor.

PMID: 9119004 [PubMed - indexed for MEDLINE]



Source: PubMed
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