1xpq
From Proteopedia
Crystal structure of fms1, a polyamine oxidase from yeast
Structural highlights
Function[FMS1_YEAST] Involved in the production of beta-alanine, a precursor of pantothenic acid. Multicopy suppressor of fenpropimorph resistance.[1] [2] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedFms1 is a rate-limiting enzyme for the biosynthesis of pantothenic acid in yeast. Fms1 has polyamine oxidase (PAO) activity, which converts spermine into spermidine and 3-aminopropanal. The 3-aminopropanal is further oxidized to produce beta-alanine, which is necessary for the biosynthesis of pantothenic acid. The crystal structures of Fms1 and its complex with the substrate spermine have been determined using the single-wavelength anomalous diffraction (SAD) phasing method. Fms1 consists of an FAD-binding domain, with Rossmann fold topology, and a substrate-binding domain. The active site is a tunnel located at the interface of the two domains. The substrate spermine binds to the active site mainly via hydrogen bonds and hydrophobic interactions. In the complex, C11 but not C9 of spermine is close enough to the catalytic site (N5 of FAD) to be oxidized. Therefore, the products are spermidine and 3-aminopropanal, rather than 3-(aminopropyl) 4-aminobutyraldehyde and 1,3-diaminoprone. Crystal structures of Fms1 and its complex with spermine reveal substrate specificity.,Huang Q, Liu Q, Hao Q J Mol Biol. 2005 May 13;348(4):951-9. PMID:15843025[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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