PMID: 6406674Apr 25, 1983Paper

Structure of oxidized flavodoxin from Anacystis nidulans

Journal of Molecular Biology
W W SmithK T Yasunobu

Abstract

The structure of oxidized flavodoxin from the cyanobacterium Anacystis nidulans has been determined at 2.5 A resolution with phases calculated from ethylmercury phosphate and dimercuriacetate derivatives. The determination of partial sequences, including a total of 85 residues, has assisted in the interpretation of the electron density. Preliminary refinement of a partial model (1072 atoms) has reduced R to 0.349 for the 10.997 reflections between 2.0 and 5.0 A with 1 greater than 2 sigma. The polypeptide backbone, which comprises 167 residues in the current model, adopts the familiar beta-alpha-beta conformation found in other flavodoxins and in the nucleotide-binding domains of the pyridine-nucleotide dehydrogenases, with five parallel strands in the central sheet. Comparison with flavodoxin from Clostridium MP (138 residues) shows that extra residues of A. nidulans flavodoxin are accommodated in a major insertion about 20 residues in length, which forms a lobe adjacent to the fifth strand of parallel sheet, and in additions to several external segments. Residues added between the fourth sheet strand and the start of the third helix alter the environment of the pyrimidine end of the flavin mononucleotide ring. The flavin mono...Continue Reading

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