Molecular characterization of dioxygenases from polycyclic aromatic hydrocarbon-degrading Mycobacterium spp
Polycyclic aromatic hydrocarbon (PAH)-degrading genes nidA and nidB that encode the α and β subunits of the aromatic ring-hydroxylating dioxygenase have been cloned and sequenced from Mycobacterium vanbaalenii PYR-1 [Khan et al., Appl. Environ Microbiol. 67 (2001) 3577–3585]. In this study, the pres...
Gespeichert in:
Veröffentlicht in: | FEMS microbiology letters 2003-06, Vol.223 (2), p.177-183 |
---|---|
Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | Polycyclic aromatic hydrocarbon (PAH)-degrading genes
nidA and
nidB that encode the α and β subunits of the aromatic ring-hydroxylating dioxygenase have been cloned and sequenced from
Mycobacterium vanbaalenii PYR-1 [Khan et al., Appl. Environ Microbiol. 67 (2001) 3577–3585]. In this study, the presence of
nidA and
nidB in 12 other
Mycobacterium or
Rhodococcus strains was investigated. Initially, all strains were screened for their ability to degrade PAHs by a spray plate method, and for the presence of the dioxygenase Rieske center region by polymerase chain reaction (PCR). Only
Mycobacterium sp. PAH 2.135 (RJGII-135),
M. flavescens PYR-GCK (ATCC 700033),
M. gilvum BB1 (DSM 9487) and
M. frederiksbergense FAn9T (DSM 44346), all previously known PAH degraders, were positive in both tests. From the three positive strains, complete open reading frames of the
nidA and
nidB genes were amplified by PCR, using primers designed according to the known
nidA and
nidB sequences from PYR-1, cloned in the pBAD/Thio-TOPO vector and sequenced. The sequences showed >98% identity with the
M. vanbaalenii PYR-1
nidA and
nidB genes. Southern DNA–DNA hybridization using
nidA and
nidB probes from PYR-1 revealed that there is more than one copy of
nidA and
nidB genes in the strains PYR-1, BB1, PYR-GCK and FAn9T. However, only one copy of each gene was observed in PAH2.135. |
---|---|
ISSN: | 0378-1097 1574-6968 |
DOI: | 10.1016/S0378-1097(03)00328-8 |