title: Bacterial degradation of pyrene in minimal salt medium mediated by catechol dioxygenases: enzyme purification and molecular size determination.
abstract: In vitro degradation of pyrene was studied in MSM by three bacterial strains individually, designated as BP10, NJ2 and P2. Among these strains, NJ2 was the highest degrader (60%) of pyrene, followed by BP10 (44%) and the least was P2 (42%) in MSM with pyrene (50 μg ml(-1)) in 8 days. During pyrene degradation, catechol 1,2 dioxygenase (C12O) activity was induced by 13 folds in BP10 and 17 folds in P2 as compared to catechol 2,3 dioxygenase (C23O). However, in NJ2, C23O activity was augmented 1.3 times more than C12O. This clearly indicated that C12O played a major role in pyrene degradation by BP10 and P2, while in NJ2, C23O contributed more to degradation process than C12O. Molecular weight of highly inducible C12O was determined as ~64 kDa by size exclusion chromatography and as ~32 kDa on denaturing SDS PAGE in BP10 which indicated dimeric nature of the enzyme.
authors: Environmental Science Division, CSIR-National Botanical Research Institute, Lucknow 226001, UP, India. drsn06@gmail.com
authors: S N
authors: SN
authors: Singh
authors: Babita
authors: B
authors: Kumari
authors: Santosh Kumar
authors: SK
authors: Upadhyay
authors: Shweta
authors: S
authors: Mishra
authors: Dileep
authors: D
authors: Kumar
mesh_terms: D001419:Bacteria / Q000187:drug effects* / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development; D001426:Bacterial Proteins / Q000378:metabolism; D001483:Base Sequence; D001673:Biodegradation, Environmental / Q000187:drug effects; D050548:Catechol 1,2-Dioxygenase / Q000737:chemistry / Q000302:isolation & purification*; D050557:Catechol 2,3-Dioxygenase / Q000737:chemistry / Q000302:isolation & purification*; D003470:Culture Media / Q000494:pharmacology*; D004591:Electrophoresis, Polyacrylamide Gel; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D008969:Molecular Sequence Data; D008970:Molecular Weight; D010084:Oxidation-Reduction / Q000187:drug effects; D010802:Phylogeny; D011721:Pyrenes / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; D003470:Culture Media; D011721:Pyrenes; C030984:pyrene; D050548:Catechol 1,2-Dioxygenase; D050557:Catechol 2,3-Dioxygenase