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Kinetic Property and Phylogenie Relationship of 2-Hydroxy-muconic Semialdehyde Dehydrogenase Encoded in tomC Gene of Burkholderia cepacia G4  

Reddy, Alavala-Matta (College of Pharmacy and Research Center for Bioresource and Health, Chungbuk National University)
Min, Kyung-Rak (College of Pharmacy and Research Center for Bioresource and Health, Chungbuk National University)
Lee, Kyoung (College of Natural Science, Changwon National University)
Lim, Jai-Yun (College of Natural Sciences, Chungbuk National University)
Kim, Chi-Kyung (College of Natural Sciences, Chungbuk National University)
Kim, Young-Soo (College of Pharmacy and Research Center for Bioresource and Health, Chungbuk National University)
Publication Information
Archives of Pharmacal Research / v.27, no.5, 2004 , pp. 570-575 More about this Journal
Abstract
2-Hydroxymuconic semialdehyde (2-HMS) dehydrogenase catalyzes the conversion of 2-HMS to 4-oxalocrotonate, which is a step in the meta cleavage pathway of aromatic hydrocarbons in bacteria. A tomC gene that encodes 2-HMS dehydrogenase of Burkholderia cepacia G4, a soil bacterium that can grow on toluene, cresol, phenol, or benzene, was overexpressed into E. coli HB 101, and its gene product was characterized in this study. 2-HMS dehydrogenase from B. cepacia G4 has a high catalytic efficiency in terms of V$_{max}$K$_{max}$ towards 2-hydroxy-5-methyl-muconic semialdehyde followed by 2-HMS but has a very low efficiency for 5-chloro-2-hydroxymuconic semialdehyde. However, the enzyme did not utilize 2-hydroxy-6-oxo-hepta 2,4-dienoic acid and 2-hydroxy-6-oxo-6-phenylhexa-2,4-dienoic acid as substrates. The molecular weight of 2-HMS dehydrogenase from B. cepacia G4 was predicted to be 52 kDa containing 485 amino acid residues from the nucleotide sequence of the tomC gene, and it exhibited the highest identity of 78% with the amino acid sequence of 2-HMS dehydrogenase that is encoded in the aphC gene of Comamonas testosteroni TA441. 2-HMS dehydrogenase from B. cepacia G4 showed a significant phylogenetic relationship not only with other 2-HMS dehydrogenases, but also with different dehydrogenases from evolutionarily distant organisms.sms.
Keywords
Burkholderia cepacia G4; 2-Hydroxymuconic semialdehyde dehydrogenase; Kinetic paramenter; Phylogenetic relationship;
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