Structural highlights
4keq is a 1 chain structure with sequence from Mesorhizobium japonicum (strain lmg 29417 / cect 9101 / maff 303099). Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
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| Ligands: | , , , |
| Related: | 4kep, 3aj3 |
| Gene: | mlr6805 (Mesorhizobium japonicum (strain LMG 29417 / CECT 9101 / MAFF 303099)) |
| Activity: | 4-pyridoxolactonase, with EC number 3.1.1.27 |
| Resources: | FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT |
Function
[PDLA_RHILO] Involved in the degradation of pyridoxine or pyridoxamine (free, phosphate-unbound, forms of vitamin B6). Hydrolyzes 4-pyridoxolactone to 4-pyridoxic acid. Has lower activity toward N-hexanoyl-D,L-homoserine lactone, but is not active toward 5-pyridoxolactone and gamma-butyrolactone.
Publication Abstract from PubMed
4-Pyridoxolactonase from Mesorhizobium loti catalyzes the zinc-dependent lactone-ring hydrolysis of 4-pyridoxolactone (4PAL) to 4-pyridoxic acid (4PA) in vitamin B6 degradation pathway I. The crystal structures of 4-pyridoxolactonase and its complex with 5-pyridoxolactone (5PAL; the competitive inhibitor) were determined. The overall structure was an alphabeta/betaalpha sandwich fold, and two zinc ions were coordinated. This strongly suggested that the enzyme belongs to subclass B3 of the class B beta-lactamases. In the complex structure, the carbonyl group of 5PAL pointed away from the active site, revealing why it acts as a competitive inhibitor. Based on docking simulation with 4PAL, 4PA and a reaction intermediate, 4-pyridoxolactonase probably catalyzes the reaction through a subclass B2-like mechanism, not the subclass B3 mechanism.
Structure of 4-pyridoxolactonase from Mesorhizobium loti.,Kobayashi J, Yoshikane Y, Yagi T, Baba S, Mizutani K, Takahashi N, Mikami B Acta Crystallogr F Struct Biol Commun. 2014 Apr;70(Pt 4):424-32. doi:, 10.1107/S2053230X14003926. Epub 2014 Mar 25. PMID:24699732[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Kobayashi J, Yoshikane Y, Yagi T, Baba S, Mizutani K, Takahashi N, Mikami B. Structure of 4-pyridoxolactonase from Mesorhizobium loti. Acta Crystallogr F Struct Biol Commun. 2014 Apr;70(Pt 4):424-32. doi:, 10.1107/S2053230X14003926. Epub 2014 Mar 25. PMID:24699732 doi:http://dx.doi.org/10.1107/S2053230X14003926
