4p93

Publication Abstract from PubMed

Dienelactone hydrolase (DLH) is a monomeric protein with a simple alpha/beta-hydrolase fold structure. It readily crystallizes in space group P212121 from either a phosphate or ammonium sulfate precipitation buffer. Here, the structure of DLH at 1.85 A resolution crystallized in space group C2 with two molecules in the asymmetric unit is reported. When crystallized in space group P212121 DLH has either phosphates or sulfates bound to the protein in crucial locations, one of which is located in the active site, preventing substrate/inhibitor binding. Another is located on the surface of the enzyme coordinated by side chains from two different molecules. Crystallization in space group C2 from a sodium citrate buffer results in new crystallographic protein-protein interfaces. The protein backbone is highly similar, but new crystal contacts cause changes in side-chain orientations and in loop positioning. In regions not involved in crystal contacts, there is little change in backbone or side-chain configuration. The flexibility of surface loops and the adaptability of side chains are important factors enabling DLH to adapt and form different crystal lattices.

Crystallization of dienelactone hydrolase in two space groups: structural changes caused by crystal packing.,Porter JL, Carr PD, Collyer CA, Ollis DL Acta Crystallogr F Struct Biol Commun. 2014 Jul;70(Pt 7):884-9. doi:, 10.1107/S2053230X1401108X. Epub 2014 Jun 18. PMID:25005082^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.