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. 2003 Aug 1;373(Pt 3):733–738. doi: 10.1042/BJ20030513

X-ray structure of a putative reaction intermediate of 5-aminolaevulinic acid dehydratase.

Peter T Erskine 1, Leighton Coates 1, Danica Butler 1, James H Youell 1, Amanda A Brindley 1, Steve P Wood 1, Martin J Warren 1, Peter M Shoolingin-Jordan 1, Jonathan B Cooper 1
PMCID: PMC1223560  PMID: 12777167

Abstract

The X-ray structure of yeast 5-aminolaevulinic acid dehydratase, in which the catalytic site of the enzyme is complexed with a putative cyclic intermediate composed of both substrate moieties, has been solved at 0.16 nm (1.6 A) resolution. The cyclic intermediate is bound covalently to Lys(263) with the amino group of the aminomethyl side chain ligated to the active-site zinc ion in a position normally occupied by a catalytic hydroxide ion. The cyclic intermediate is catalytically competent, as shown by its turnover in the presence of added substrate to form porphobilinogen. The findings, combined with those of previous studies, are consistent with a catalytic mechanism in which the C-C bond linking both substrates in the intermediate is formed before the C-N bond.

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Selected References

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