ExplorEnz: EC 5.1.1.22

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5.1.1.22

Accepted name:

4-hydroxyproline betaine 2-epimerase

Reaction:

(1) trans-4-hydroxy-L-proline betaine = cis-4-hydroxy-D-proline betaine
(2) L-proline betaine = D-proline betaine

Glossary:

trans-4-hydroxy-L-proline betaine = (2S,4R)-4-hydroxy-1,1-dimethylpyrrolidinium-2-carboxylate
cis-4-hydroxy-D-proline betaine = (2R,4R)-4-hydroxy-1,1-dimethylpyrrolidinium-2-carboxylate
L-proline betaine = (2S)-1,1-dimethylpyrrolidinium-2-carboxylate
D-proline betaine = (2R)-1,1-dimethylpyrrolidinium-2-carboxylate

Other name(s):

hpbD (gene name); Hyp-B 2-epimerase; (4R)-4-hydroxyproline betaine 2-epimerase

Systematic name:

4-hydroxyproline betaine 2-epimerase

Comments:

The enzyme, characterized from the bacteria Pelagibaca bermudensis and Paracoccus denitrificans, specifically catalyses racemization of trans-4-hydroxy-L-proline betaine and L-proline betaine at the C-2 position.

Links to other databases:

BRENDA, EXPASY, Gene, KEGG, MetaCyc, PDB

References:

1.	Zhao, S., Kumar, R., Sakai, A., Vetting, M.W., Wood, B.M., Brown, S., Bonanno, J.B., Hillerich, B.S., Seidel, R.D., Babbitt, P.C., Almo, S.C., Sweedler, J.V., Gerlt, J.A., Cronan, J.E. and Jacobson, M.P. Discovery of new enzymes and metabolic pathways by using structure and genome context. Nature 502 (2013) 698–702. [DOI] [PMID: 24056934]
2.	Kumar, R., Zhao, S., Vetting, M.W., Wood, B.M., Sakai, A., Cho, K., Solbiati, J., Almo, S.C., Sweedler, J.V., Jacobson, M.P., Gerlt, J.A. and Cronan, J.E. Prediction and biochemical demonstration of a catabolic pathway for the osmoprotectant proline betaine. MBio 5 (2014) e00933. [DOI] [PMID: 24520058]

[EC 5.1.1.22 created 2017]