5HOP image
Entry Detail
PDB ID:
5HOP
Keywords:
Title:
1.65 Angstrom resolution crystal structure of lmo0182 (residues 1-245) from Listeria monocytogenes EGD-e
Biological Source:
PDB Version:
Deposition Date:
2016-01-19
Release Date:
2017-02-01
Method Details:
Experimental Method:
Resolution:
1.65 Å
R-Value Free:
0.19
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
P 43
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Lmo0182 protein
Mutations:UNP residues 2-245
Chain IDs:A, B
Chain Length:248
Number of Molecules:2
Biological Source:Listeria monocytogenes serovar 1/2a (strain ATCC BAA-679 / EGD-e)
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET modified residue
Ligand Molecules
Primary Citation
Transferase Versus Hydrolase: The Role of Conformational Flexibility in Reaction Specificity.
Structure 25 295 304 (2017)
PMID: 28089449 DOI: 10.1016/j.str.2016.12.007

Abstact

Active in the aqueous cellular environment where a massive excess of water is perpetually present, enzymes that catalyze the transfer of an electrophile to a non-water nucleophile (transferases) require specific strategies to inhibit mechanistically related hydrolysis reactions. To identify principles that confer transferase versus hydrolase reaction specificity, we exploited two enzymes that use highly similar catalytic apparatuses to catalyze the transglycosylation (a transferase reaction) or hydrolysis of α-1,3-glucan linkages in the cyclic tetrasaccharide cycloalternan (CA). We show that substrate binding to non-catalytic domains and a conformationally stable active site promote CA transglycosylation, whereas a distinct pattern of active site conformational change is associated with CA hydrolysis. These findings defy the classic view of induced-fit conformational change and illustrate a mechanism by which a stable hydrophobic binding site can favor transferase activity and disfavor hydrolysis. Application of these principles could facilitate the rational reengineering of transferases with desired catalytic properties.

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Primary Citation of related structures