PROSITE documentation PDOC00833Ribulose-phosphate 3-epimerase family signatures
Ribulose-phosphate 3-epimerase (EC 5.1.3.1) (also known as pentose-5-phosphate 3-epimerase or PPE) is the enzyme that converts D-ribulose 5-phosphate into D-xylulose 5-phosphate in Calvin's reductive pentose phosphate cycle. In Alcaligenes eutrophus two copies of the gene coding for PPE are known [1], one is chromosomally encoded (cbbEC), the other one is on a plasmid (cbbeP). PPE has been found in a wide range of organisms from all kingdoms of life. The sequence of PPE is highly related to:
- Escherichia coli D-allulose-6-phosphate 3-epimerase (gene alsE).
- Escherichia coli protein sgcE.
All these proteins have from 209 to 241 amino acid residues.
As signature patterns, we selected two conserved regions which are located in respectively in the N-terminal and in the central part of these proteins.
Last update:December 2008 / Text revised.
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| 1 | Authors | Kusian B. Yoo J.G. Bednarski R. Bowien B. |
| Title | The Calvin cycle enzyme pentose-5-phosphate 3-epimerase is encoded within the cfx operons of the chemoautotroph Alcaligenes eutrophus. | |
| Source | J. Bacteriol. 174:7337-7344(1992). | |
| PubMed ID | 1429456 |
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