4PMH image
Deposition Date 2014-05-21
Release Date 2014-11-12
Last Version Date 2024-10-23
Entry Detail
PDB ID:
4PMH
Keywords:
Title:
The structure of rice weevil pectin methyl esterase
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.79 Å
R-Value Free:
0.22
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Pectinesterase
Gene (Uniprot):CE8-1
Chain IDs:A
Chain Length:366
Number of Molecules:1
Biological Source:Sitophilus oryzae
Primary Citation
The structure of rice weevil pectin methylesterase.
Acta Crystallogr.,Sect.F 70 1480 1484 (2014)
PMID: 25372813 DOI: 10.1107/S2053230X14020433

Abstact

Rice weevils (Sitophilus oryzae) use a pectin methylesterase (EC 3.1.1.11), along with other enzymes, to digest cell walls in cereal grains. The enzyme is a right-handed β-helix protein, but is circularly permuted relative to plant and bacterial pectin methylesterases, as shown by the crystal structure determination reported here. This is the first structure of an animal pectin methylesterase. Diffraction data were collected to 1.8 Å resolution some time ago for this crystal form, but structure solution required the use of molecular-replacement techniques that have been developed and similar structures that have been deposited in the last 15 years. Comparison of the structure of the rice weevil pectin methylesterase with that from Dickeya dandantii (formerly Erwinia chrysanthemi) indicates that the reaction mechanisms are the same for the insect, plant and bacterial pectin methylesterases. The similarity of the structure of the rice weevil enzyme to the Escherichia coli lipoprotein YbhC suggests that the evolutionary origin of the rice weevil enzyme was a bacterial lipoprotein, the gene for which was transferred to a primitive ancestor of modern weevils and other Curculionidae. Structural comparison of the rice weevil pectin methylesterase with plant and bacterial enzymes demonstrates that the rice weevil protein is circularly permuted relative to the plant and bacterial molecules.

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Primary Citation of related structures