2iuk
From Proteopedia
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CRYSTAL STRUCTURE OF SOYBEAN LIPOXYGENASE-D
Overview
The lipoxygenase family of lipid-peroxidizing, nonheme iron dioxygenases, form products that are precursors for diverse physiological processes in, both plants and animals. In soybean (Glycine max), five vegetative, isoforms, VLX-A, VLX-B, VLX-C, VLX-D, VLX-E, and four seed isoforms LOX-1, LOX-2, LOX-3a, LOX-3b have been identified. In this study, we determined, the crystal structures of the substrate-free forms of two major vegetative, isoforms, with distinct enzymatic characteristics, VLX-B and VLX-D. Their, structures are similar to the two seed isoforms, LOX-1 and LOX-3, having, two domains with similar secondary structural elements: a beta-barrel, N-terminal domain containing highly flexible loops and an alpha-helix-rich, C-terminal catalytic domain. Detailed comparison of the structures of, these two vegetative isoforms with the structures of LOX-1 and LOX-3, reveals important differences that help explain distinct aspects of the, activity and positional specificity of these enzymes. In particular, the, shape of the three branches of the internal subcavity, corresponding to, substrate-binding and O(2) access, differs among the isoforms in a manner, that reflects the differences in positional specificities.
About this Structure
2IUK is a Single protein structure of sequence from Glycine max with FE as ligand. Active as Lipoxygenase, with EC number 1.13.11.12 Structure known Active Site: AC1. Full crystallographic information is available from OCA.
Reference
Crystal structures of vegetative soybean lipoxygenase VLX-B and VLX-D, and comparisons with seed isoforms LOX-1 and LOX-3., Youn B, Sellhorn GE, Mirchel RJ, Gaffney BJ, Grimes HD, Kang C, Proteins. 2006 Dec 1;65(4):1008-20. PMID:17022084
Page seeded by OCA on Mon Nov 5 13:17:35 2007
