2qet
From Proteopedia
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Structure of the mutant S211A of the ribosome inactivating protein PDL4 from P. dioica in complex with adenine
Overview
The ribosome inactivating protein PD-L4 from Phytolacca dioica is a N-beta-glycosidase, probably involved in plant defence. The crystal structures of wild type PD-L4 and of the S211A PD-L4 mutant with significantly decreased catalytic activity were determined at atomic resolution. To determine the structural determinants for the reduced activity of S211A PD-L4, both forms have also been co-crystallized with adenine, the major product of PD-L4 catalytic reaction. In the structure of the S211A mutant, the cavity formed by the lack of the Ser hydroxyl group is filled by a water molecule; the insertion of this non-isosteric group leads to small albeit concerted changes in the tightly packed active site of the enzyme. These changes have been correlated to the different activity of the mutant enzyme. This work highlights the importance of atomic resolution studies for the deep understanding of enzymatic properties. Proteins 2008. (c) 2007 Wiley-Liss, Inc.
About this Structure
2QET is a Single protein structure of sequence from Phytolacca dioica with as ligand. Active as rRNA N-glycosylase, with EC number 3.2.2.22 Known structural/functional Site: . Full crystallographic information is available from OCA.
Reference
Atomic resolution (1.1 A) structure of the ribosome-inactivating protein PD-L4 from Phytolacca dioica L. leaves., Ruggiero A, Chambery A, Maro AD, Parente A, Berisio R, Proteins. 2007 Oct 26;71(1):8-15. PMID:17963235
Page seeded by OCA on Wed Feb 27 07:59:14 2008
