The structure of rice weevil pectin methylesterase
| Autor: | Ronald E. Stenkamp, Kirk L. Pappan, John C. Reese, David C. Teller, Zicheng Shen, Craig A. Behnke, Gerald R. Reeck |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
food.ingredient
Pectin Biophysics Dickeya Biology medicine.disease_cause Biochemistry Protein Structure Secondary Cell wall food Rice weevil X-Ray Diffraction Structural Biology Botany Hydrolase Genetics medicine Structural Communications Animals Escherichia coli chemistry.chemical_classification Sitophilus food and beverages Oryza Condensed Matter Physics biology.organism_classification Enzyme chemistry Weevils Carboxylic Ester Hydrolases |
| Zdroj: | Acta Crystallographica Section F Structural Biology Communications. 70:1480-1484 |
| ISSN: | 2053-230X |
| DOI: | 10.1107/s2053230x14020433 |
| Popis: | 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 fromDickeya dandantii(formerlyErwinia 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 theEscherichia colilipoprotein 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. |
| Databáze: | OpenAIRE |
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