2VH9 image
Entry Detail
PDB ID:
2VH9
Keywords:
Title:
CRYSTAL STRUCTURE OF NXG1-DELTAYNIIG IN COMPLEX WITH XLLG, A XYLOGLUCAN DERIVED OLIGOSACCHARIDE
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2007-11-20
Release Date:
2008-11-25
Method Details:
Experimental Method:
Resolution:
2.10 Å
R-Value Free:
0.20
R-Value Work:
0.14
R-Value Observed:
0.15
Space Group:
P 31
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:CELLULASE
Chain IDs:A, B
Chain Length:290
Number of Molecules:2
Biological Source:TROPAEOLUM MAJUS
Primary Citation
Analysis of Nasturtium Tmnxg1 Complexes by Crystallography and Molecular Dynamics Provides Detailed Insight Into Substrate Recognition by Family Gh16 Xyloglucan Endo-Transglycosylases and Endo-Hydrolases.
Proteins 75 820 ? (2009)
PMID: 19004021 DOI: 10.1002/PROT.22291

Abstact

Reorganization and degradation of the wall crosslinking and seed storage polysaccharide xyloglucan by glycoside hydrolase family 16 (GH16) endo-transglycosylases and hydrolases are crucial to the growth of the majority of land plants, affecting processes as diverse as germination, morphogenesis, and fruit ripening. A high-resolution, three-dimensional structure of a nasturtium (Tropaeolum majus) endo-xyloglucanase loop mutant, TmNXG1-DeltaYNIIG, with an oligosaccharide product bound in the negative active-site subsites, has been solved by X-ray crystallography. Comparison of this novel complex to that of the strict xyloglucan endo-transglycosylase PttXET16-34 from hybrid aspen (Populus tremula x tremuloides), previously solved with a xylogluco-oligosaccharide bound in the positive subsites, highlighted key protein structures that affect the disparate catalytic activities displayed by these closely related enzymes. Combination of these "partial" active-site complexes through molecular dynamics simulations in water allowed modeling of wild-type TmNXG1, TmNXG1-DeltaYNIIG, and wild-type PttXET16-34 in complex with a xyloglucan octadecasaccharide spanning the entire catalytic cleft. A comprehensive analysis of these full-length complexes underscored the importance of various loops lining the active site. Subtle differences leading to a tighter hydrogen bonding pattern on the negative (glycosyl donor) binding subsites, together with loop flexibility on the positive (glycosyl acceptor) binding subsites appear to favor hydrolysis over transglycosylation in GH16 xyloglucan-active enzymes.

Legend

Protein

Chemical

Disease

Primary Citation of related structures