title: 1H and 15N NMR resonance assignments and solution secondary structure of oxidized Desulfovibrio desulfuricans flavodoxin.
abstract: Sequence-specific 1H and 15N resonance assignments have been made for 137 of the 146 nonprolyl residues in oxidized Desulfovibrio desulfuricans [Essex 6] flavodoxin. Assignments were obtained by a concerted analysis of the heteronuclear three-dimensional 1H-15N NOESY-HMQC and TOCSY-HMQC data sets, recorded on uniformly 15N-enriched protein at 300 K. Numerous side-chain resonances have been partially or fully assigned. Residues with overlapping 1HN chemical shifts were resolved by a three-dimensional 1H-15N HMQC-NOESY-HMQC spectrum. Medium- and long-range NOEs, 3JNH alpha coupling constants, and 1HN exchange data indicate a secondary structure consisting of five parallel beta-strands and four alpha-helices with a topology similar to that of Desulfovibrio vulgaris [Hildenborough] flavodoxin. Prolines at positions 106 and 134, which are not conserved in D. vulgaris flavodoxin, contort the two C-terminal alpha-helices.
authors.affiliation: Pharmacia and Upjohn, Inc., Kalamazoo, MI 49001-0199, USA.
authors.forename: J R
authors.initials: JR
authors.lastname: Pollock
authors.forename: R P
authors.initials: RP
authors.lastname: Swenson
authors.forename: B J
authors.initials: BJ
authors.lastname: Stockman
mesh_terms: D000595:Amino Acid Sequence; D003901:Desulfovibrio / Q000737:chemistry / Q000235:genetics; D016969:Desulfovibrio vulgaris / Q000737:chemistry / Q000235:genetics; D005418:Flavodoxin / Q000737:chemistry* / Q000235:genetics; D006859:Hydrogen / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D009587:Nitrogen Isotopes; D010084:Oxidation-Reduction; D017433:Protein Structure, Secondary; D017386:Sequence Homology, Amino Acid; D012996:Solutions; D013045:Species Specificity
chemical_list: D005418:Flavodoxin; D009587:Nitrogen Isotopes; D012996:Solutions; D006859:Hydrogen