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1qhm

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{{STRUCTURE_1qhm| PDB=1qhm | SCENE= }}
{{STRUCTURE_1qhm| PDB=1qhm | SCENE= }}
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'''ESCHERICHIA COLI PYRUVATE FORMATE LYASE LARGE DOMAIN'''
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===ESCHERICHIA COLI PYRUVATE FORMATE LYASE LARGE DOMAIN===
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==Overview==
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BACKGROUND: Pyruvate formate lyase (PFL) catalyses a key step in Escherichia coli anaerobic glycolysis by converting pyruvate and CoA to formate and acetylCoA. The PFL mechanism involves an unusual radical cleavage of pyruvate, involving an essential C alpha radical of Gly734 and two cysteine residues, Cys418 and Cys419, which may form thiyl radicals required for catalysis. We undertook this study to understand the structural basis for catalysis. RESULTS: The first structure of a fragment of PFL (residues 1-624) at 2.8 A resolution shows an unusual barrel-like structure, with a catalytic beta finger carrying Cys418 and Cys419 inserted into the centre of the barrel. Several residues near the active-site cysteines can be ascribed roles in the catalytic mechanism: Arg176 and Arg435 are positioned near Cys419 and may bind pyruvate/formate and Trp333 partially buries Cys418. Both cysteine residues are accessible to each other owing to their cis relationship at the tip of the beta finger. Finally, two clefts that may serve as binding sites for CoA and pyruvate have been identified. CONCLUSIONS: PFL has striking structural homology to the aerobic ribonucleotide reductase (RNR): the superposition of PFL and RNR includes eight of the ten strands in the unusual RNR alpha/beta barrel as well as the beta finger, which carries key catalytic residues in both enzymes. This provides the first structural proof that RNRs and PFLs are related by divergent evolution from a common ancestor.
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(as it appears on PubMed at http://www.pubmed.gov), where 10425676 is the PubMed ID number.
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{{ABSTRACT_PUBMED_10425676}}
==About this Structure==
==About this Structure==
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[[Category: Pyruvate formate lyase]]
[[Category: Pyruvate formate lyase]]
[[Category: X-ray crystallography]]
[[Category: X-ray crystallography]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 02:18:52 2008''

Revision as of 23:18, 27 July 2008

Image:1qhm.png

Template:STRUCTURE 1qhm

ESCHERICHIA COLI PYRUVATE FORMATE LYASE LARGE DOMAIN

Template:ABSTRACT PUBMED 10425676

About this Structure

1QHM is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Pyruvate formate lyase is structurally homologous to type I ribonucleotide reductase., Leppanen VM, Merckel MC, Ollis DL, Wong KK, Kozarich JW, Goldman A, Structure. 1999 Jul 15;7(7):733-44. PMID:10425676

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