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3pfl
From Proteopedia
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'''CRYSTAL STRUCTURE OF PFL FROM E.COLI IN COMPLEX WITH SUBSTRATE ANALOGUE OXAMATE''' | '''CRYSTAL STRUCTURE OF PFL FROM E.COLI IN COMPLEX WITH SUBSTRATE ANALOGUE OXAMATE''' | ||
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[[Category: Schultz, S.]] | [[Category: Schultz, S.]] | ||
[[Category: Wagner, A F.V.]] | [[Category: Wagner, A F.V.]] | ||
| - | [[Category: | + | [[Category: Glucose metabolism]] |
| - | [[Category: | + | [[Category: Glycyl radical enzyme]] |
| - | [[Category: | + | [[Category: Transferase]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 22:10:12 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 19:10, 4 May 2008
CRYSTAL STRUCTURE OF PFL FROM E.COLI IN COMPLEX WITH SUBSTRATE ANALOGUE OXAMATE
Overview
Pyruvate formate-lyase (PFL) from Escherichia coli uses a radical mechanism to reversibly cleave the C1-C2 bond of pyruvate using the Gly 734 radical and two cysteine residues (Cys 418, Cys 419). We have determined by X-ray crystallography the structures of PFL (non-radical form), its complex with the substrate analog oxamate, and the C418A,C419A double mutant. The atomic model (a dimer of 759-residue monomers) comprises a 10-stranded beta/alpha barrel assembled in an antiparallel manner from two parallel five-stranded beta-sheets; this architecture resembles that of ribonucleotide reductases. Gly 734 and Cys 419, positioned at the tips of opposing hairpin loops, meet in the apolar barrel center (Calpha-Sgamma = 3.7 A). Oxamate fits into a compact pocket where C2 is juxtaposed with Cys 418Sgamma (3.3 A), which in turn is close to Cys 419Sgamma (3.7 A). Our model of the active site is suggestive of a snapshot of the catalytic cycle, when the pyruvate-carbonyl awaits attack by the Cys 418 thiyl radical. We propose a homolytic radical mechanism for PFL that involves Cys 418 and Cys 419 both as thiyl radicals, with distinct chemical functions.
About this Structure
3PFL is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Structure and mechanism of the glycyl radical enzyme pyruvate formate-lyase., Becker A, Fritz-Wolf K, Kabsch W, Knappe J, Schultz S, Volker Wagner AF, Nat Struct Biol. 1999 Oct;6(10):969-75. PMID:10504733 Page seeded by OCA on Sun May 4 22:10:12 2008
