Bacterial-like nitric oxide synthase in the haloalkaliphilic archaeon Natronomonas pharaonis.

Abstract:

:Bacterial nitric oxide (NO) synthases (bNOS) play diverse and important roles in microbial physiology, stress resistance, and virulence. Although bacterial and mammalian NOS enzymes have been well-characterized, comparatively little is known about the prevalence and function of NOS enzymes in Archaea. Analysis of archaeal genomes revealed that highly conserved bNOS homologs were restricted to members of the Halobacteria. Of these, Natronomonas pharaonis NOS (npNOS) was chosen for further characterization. NO production was confirmed in heterologously expressed His-tagged npNOS by coupling nitrite production from N-hydroxy-L-arginine in an H2O2-supported reaction. Additionally, the nos gene was successfully targeted and disrupted to create a Nmn. pharaonis nos mutant by adapting an established Natrialba magadii transformation protocol. Genome re-sequencing of this mutant revealed an additional frameshift in a putative cation-acetate symporter gene, which could contribute to altered acetate metabolism in the nos mutant. Inactivation of Nmn. pharaonis nos was also associated with several phenotypes congruent with bacterial nos mutants (altered growth, increased oxygen consumption, increased pigment, increased UV susceptibility), suggesting that NOS function may be conserved between bacteria and archaea. These studies are the first to describe genetic inactivation and characterization of a Nmn. pharaonis gene and provides enhanced tools for probing its physiology.

journal_name

Microbiologyopen

journal_title

MicrobiologyOpen

authors

Orsini SS,James KL,Reyes DJ,Couto-Rodriguez RL,Gulko MK,Witte A,Carroll RK,Rice KC

doi

10.1002/mbo3.1124

subject

Has Abstract

pub_date

2020-11-01 00:00:00

pages

e1124

issue

11

issn

2045-8827

journal_volume

9

pub_type

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