1e73

From Proteopedia

Revision as of 08:58, 30 October 2007

2-F-GLUCOSYLATED MYROSINASE FROM SINAPIS ALBA WITH BOUND L-ASCORBATE

Overview

Myrosinase, an S-glycosidase, hydrolyzes plant anionic, 1-thio-beta-d-glucosides (glucosinolates) considered part of the plant, defense system. Although O-glycosidases are ubiquitous, myrosinase is the, only known S-glycosidase. Its active site is very similar to that of, retaining O-glycosidases, but one of the catalytic residues in, O-glycosidases, a carboxylate residue functioning as the general base, is, replaced by a glutamine residue. Myrosinase is strongly activated by, ascorbic acid. Several binary and ternary complexes of myrosinase with, different transition state analogues and ascorbic acid have been analyzed, at high resolution by x-ray crystallography along with a, 2-deoxy-2-fluoro-glucosyl enzyme intermediate. One of the inhibitors, d-gluconhydroximo-1,5-lactam, binds ... [(full description)]

About this Structure

1E73 is a [Protein complex] structure of sequences from [Sinapis alba] with NAG, G2F, SO4, ZN, ASC and GOL as [ligands]. Active as [Transferred entry: 3.2.1.147], with EC number [3.2.3.1]. Structure known Active Sites: ACT, ASC and ZNB. Full crystallographic information is available from [OCA].

Reference

High resolution X-ray crystallography shows that ascorbate is a cofactor for myrosinase and substitutes for the function of the catalytic base., Burmeister WP, Cottaz S, Rollin P, Vasella A, Henrissat B, J Biol Chem. 2000 Dec 15;275(50):39385-93. PMID:10978344

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