Isolation and characterization of an NAD+-degrading bacterium PTX1 and its role in chromium biogeochemical cycle.

Abstract:

:Microorganisms can reduce toxic chromate to less toxic trivalent chromium [Cr(III)]. Besides Cr(OH)(3) precipitates, some soluble organo-Cr(III) complexes are readily formed upon microbial, enzymatic, and chemical reduction of chromate. However, the biotransformation of the organo-Cr(III) complexes has not been characterized. We have previously reported the formation of a nicotinamide adenine dinucleotide (NAD(+))-Cr(III) complex after enzymatic reduction of chromate. Although the NAD(+)-Cr(III) complex was stable under sterile conditions, microbial cells were identified as precipitates in a non-sterile NAD(+)-Cr(III) solution after extended incubation. The most dominant bacterium PTX1 was isolated and assigned to Leifsonia genus by phylogenetic analysis of 16S rRNA gene sequence. PTX1 grew slowly on NAD(+) with a doubling time of 17 h, and even more slowly on the NAD(+)-Cr(III) complex with an estimated doubling time of 35 days. The slow growth suggests that PTX1 passively grew on trace NAD(+) dissociated from the NAD(+)-Cr(III) complex, facilitating further dissociation of the complex and formation of Cr(III) precipitates. Thus, organo-Cr(III) complexes might be an intrinsic link of the chromium biogeochemical cycle; they can be produced during chromate reduction and then further mineralized by microorganisms.

journal_name

Biodegradation

journal_title

Biodegradation

authors

Puzon GJ,Huang Y,Dohnalkova A,Xun L

doi

10.1007/s10532-007-9147-1

subject

Has Abstract

pub_date

2008-06-01 00:00:00

pages

417-24

issue

3

eissn

0923-9820

issn

1572-9729

journal_volume

19

pub_type

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