Chronophin

Definition:

Functions as a pyridoxal phosphate (PLP) phosphatase, which also catalyzes the dephosphorylation of pyridoxine 5'-phosphate (PNP) and pyridoxamine 5'-phosphate (PMP), with order of substrate preference PLP > PNP > PMP and therefore plays a role in vitamin B6 metabolism. Also functions as a protein serine phosphatase that specifically dephosphorylates 'Ser-3' in proteins of the actin-depolymerizing factor (ADF)/cofilin family like CFL1 and DSTN. Thereby, regulates cofilin-dependent actin cytoskeleton reorganization, being required for normal progress through mitosis and normal cytokinesis. Does not dephosphorylate phosphothreonines in LIMK1. Does not dephosphorylate peptides containing phosphotyrosine.

References:

[1]. G Gao, et al. Identification of an essential cysteine residue in pyridoxal phosphatase from human erythrocytes. J Biol Chem. 1994 Mar 18;269(11):8234-9. [Content Brief]

[2]. Antje Gohla, et al. Chronophin, a novel HAD-type serine protein phosphatase, regulates cofilin-dependent actin dynamics. Nat Cell Biol. 2005 Jan;7(1):21-9. [Content Brief]

[3]. Young Min Jang, et al. Human pyridoxal phosphatase. Molecular cloning, functional expression, and tissue distribution. J Biol Chem. 2003 Dec 12;278(50):50040-6. [Content Brief]

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