Salt Adaptation and Evolutionary Implication of a Nah-related PAHs Dioxygenase cloned from a Halophilic Phenanthrene Degrading Consortium.

Abstract:

:Polycyclic aromatic hydrocarbons (PAHs) pollutions often occur in marine and other saline environment, largely due to anthropogenic activities. However, study of the PAHs-degradation genotypes in halophiles is limited, compared with the mesophilic terrestrial PAHs degraders. In this study, a bacterial consortium (CY-1) was enriched from saline soil contaminated with crude oil using phenanthrene as the sole carbon source at 10% salinity. CY-1 was dominated by the moderate halophilic Marinobacter species, and its dominant PAHs ring-hydroxylating dioxygenase (RHD) genotypes shared high identity to the classic nah-related RHDs found in the mesophilic species. Further cloning of a 5.6-kb gene cluster from CY-1 unveiled the existence of a new type of PAHs degradation gene cluster (hpah), which most probably evolves from the nah-related gene clusters. Expression of the RHD in this gene cluster in E. coli lead to the discovery of its prominent salt-tolerant properties compared with two RHDs from mesophiles. As a common structural feature shared by all halophilic and halotolerant enzymes, higher abundance of acidic amino acids was also found on the surface of this RHD than its closest nah-related alleles. These results suggest evolution towards saline adaptation occurred after horizontal transfer of this hpah gene cluster into the halophiles.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Wang C,Guo G,Huang Y,Hao H,Wang H

doi

10.1038/s41598-017-12979-z

subject

Has Abstract

pub_date

2017-10-02 00:00:00

pages

12525

issue

1

issn

2045-2322

pii

10.1038/s41598-017-12979-z

journal_volume

7

pub_type

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