title: Degradation of (+)-catechin by Acinetobacter calcoaceticus MTC 127.
abstract: Acinetobacter calcoaceticus MTC 127 was able to grow on catechin and protocatechuic acid (PCA) as sole carbon source. Cells induced with catechin oxidized catechin and PCA at rates higher than cells of uninduced cultures. Two aromatic compounds, PCA and phloroglucinol carboxylic acid (PGCA) were isolated from culture filtrate of cells grown in catechin and characterized by infrared spectrometry and high performance thin-layer chromatography. Moreover, A. calcoaceticus MTC 127 produced high levels of PCA compared to PGCA in the degradation of catechin. Based upon these results, a pathway for the degradation of (+)-catechin in A. calcoaceticus MTC 127 is proposed. Enzymes extracted from catechin-induced culture showed catechin oxygenase (cox) and protocatechuate 3,4-dioxygenase (pcd) activities. Catechin oxygenase was purified by column chromatography and SDS-PAGE analysis showed a single band with an apparent molecular weight of 47 kDa.
authors.affiliation: Centre for Advanced Studies in Botany, University of Madras, Chennai 600025, India.
authors.forename: M
authors.initials: M
authors.lastname: Arunachalam
authors.forename: N
authors.initials: N
authors.lastname: Mohan
authors.forename: R
authors.initials: R
authors.lastname: Sugadev
authors.forename: P
authors.initials: P
authors.lastname: Chellappan
authors.forename: A
authors.initials: A
authors.lastname: Mahadevan
mesh_terms: D016954:Acinetobacter calcoaceticus / Q000378:metabolism*; D016588:Anticarcinogenic Agents / Q000378:metabolism; D001426:Bacterial Proteins / Q000302:isolation & purification / Q000378:metabolism; D002392:Catechin / Q000378:metabolism*; D002455:Cell Division / Q000502:physiology; D062385:Hydroxybenzoates / Q000737:chemistry / Q000378:metabolism; D015394:Molecular Structure; D011520:Protocatechuate-3,4-Dioxygenase / Q000378:metabolism
chemical_list: D016588:Anticarcinogenic Agents; D001426:Bacterial Proteins; D062385:Hydroxybenzoates; C009091:protocatechuic acid; D002392:Catechin; D011520:Protocatechuate-3,4-Dioxygenase