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CAH1 and CAH2 as key enzymes required for high bicarbonate tolerance of a novel microalga Dunaliella salina HTBS.

Abstract：

:Outdoor microalgal cultivation with high concentration bicarbonate has been considered as a strategy for reducing contamination and improving carbon supply efficiency. The mechanism responsible for algae's strong tolerance to high bicarbonate however, remains not clear. In this study, we isolated and characterized a strain and revealed its high bicarbonate tolerant mechanism by analyzing carbonic anhydrase (CA). The strain was identified as Dunaliella salina HTBS with broad temperature adaptability (7-30°C). The strain grew well under 30% CO2 or 70gL(-1) NaHCO3. In comparison, two periplasm CAs (CAH1 and CAH2) were detected with immunoblotting analysis in HTBS but not in a non-HCO3(-)-tolerant strain. The finding was also verified by an enzyme inhibition assay in which only HTBS showed significant inhibition by extracellular CA inhibitor. Thus, we inferred that the extracellular CAH1 and CAH2 played a multifunctional role in the toleration of high bicarbonate by HTBS.

journal_name

Enzyme Microb Technol

journal_title

Enzyme and microbial technology

authors

Hou Y,Liu Z,Zhao Y,Chen S,Zheng Y,Chen F

doi

10.1016/j.enzmictec.2016.02.010

subject

Has Abstract

pub_date

2016-06-01 00:00:00

pages

17-23

eissn

0141-0229

issn

1879-0909

pii

S0141-0229(16)30032-1

journal_volume

87-88

pub_type

杂志文章

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