1AW5

5-AMINOLEVULINATE DEHYDRATASE FROM SACCHAROMYCES CEREVISIAE

Summary for 1AW5

• Entry DOI: 10.2210/pdb1aw5/pdb
• Descriptor: 5-AMINOLEVULINATE DEHYDRATASE, ZINC ION (3 entities in total)
• Functional Keywords: dehydratase, tetrapyrrole biosynthesis, aldolase, tim-barrel octamer
• Biological source: Saccharomyces cerevisiae (baker's yeast)
• Total number of polymer chains: 1
• Total formula weight: 37751.02

Authors

Erskine, P.T.,Cooper, J.B.,Wood, S.P. (deposition date: 1997-10-09, release date: 1998-10-21, Last modification date: 2024-10-09)

Primary citation

Erskine, P.T.,Senior, N.,Awan, S.,Lambert, R.,Lewis, G.,Tickle, I.J.,Sarwar, M.,Spencer, P.,Thomas, P.,Warren, M.J.,Shoolingin-Jordan, P.M.,Wood, S.P.,Cooper, J.B.
X-ray structure of 5-aminolaevulinate dehydratase, a hybrid aldolase.
Nat.Struct.Biol., 4:1025-1031, 1997

PubMed Abstract: 5-Aminolaevulinate dehydratase (ALAD) is a homo-octameric metallo-enzyme that catalyses the formation of porphobilinogen from 5-aminolaevulinic acid. The structure of the yeast enzyme has been solved to 2.3 A resolution, revealing that each subunit adopts a TIM barrel fold with a 39 residue N-terminal arm. Pairs of monomers wrap their arms around each other to form compact dimers and these associate to form a 422 symmetric octamer. All eight active sites are on the surface of the octamer and possess two lysine residues (210 and 263), one of which, Lys 263, forms a Schiff base link to the substrate. The two lysine side chains are close to two zinc binding sites one of which is formed by three cysteine residues (133, 135 and 143) while the other involves Cys 234 and His 142. ALAD has features at its active site that are common to both metallo- and Schiff base-aldolases and therefore represents an intriguing combination of both classes of enzyme. Lead ions, which inhibit ALAD potently, replace the zinc bound to the enzyme's unique triple-cysteine site.

PubMed: 9406553
DOI: 10.1038/nsb1297-1025

Experimental method

X-RAY DIFFRACTION (2.3 Å)