Genome-wide transcriptional responses of Nitrosomonas europaea to zinc.

Abstract:

:Nitrosomonas europaea, a Gram-negative obligate chemolithoautotroph, participates in global nitrogen cycling by carrying out nitrification and derives energy for growth through oxidation of ammonia. In this work, the physiological, proteomic, and transcriptional responses of N. europaea to zinc stress were studied. The nitrite production rate and ammonia-dependent oxygen uptake rate of the cells exposed to 3.4 microM ZnCl2 decreased about 61 and 69% within 30 min, respectively. Two proteins were notably up regulated in zinc treatment and the mRNA levels of their encoding genes started to increase by 1 h after the addition of zinc. A total of 27 genes were up regulated and 30 genes were down regulated. Up-regulated genes included mercury resistance genes (merTPCAD), inorganic ion transport genes, oxidative stress genes, toxin-antitoxin genes, and two-component signal transduction systems genes. merTPCAD was the highest up-regulated operon (46-fold). Down-regulated genes included the RubisCO operon (cbbO), biosynthesis (mrsA), and amino acid transporter.

journal_name

Arch Microbiol

journal_title

Archives of microbiology

authors

Park S,Ely RL

doi

10.1007/s00203-007-0341-7

subject

Has Abstract

pub_date

2008-06-01 00:00:00

pages

541-8

issue

6

eissn

0302-8933

issn

1432-072X

journal_volume

189

pub_type

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