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Molecular cloning and transcriptional regulation of two γ-carbonic anhydrase genes in the green macroalga Ulva prolifera

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Abstract

Ulva prolifera O.F. Müller (Ulvophyceae, Chlorophyta) is well known as a typical green-tide forming macroalga which has caused the world’s largest macroalgal blooms in the Yellow Sea of China. In this study, two full-length γ-carbonic anhydrase (γ-CA) genes (UpγCA1 and UpγCA2) were cloned from U. prolifera. UpγCA1 has three conserved histidine residues, which act as an active site for binding a zinc metal ion. In UpγCA2, two of the three histidine residues were replaced by serine and arginine, respectively. The two γ-CA genes are clustered together with other γ-CAs in Chlorophyta with strong support value (100% bootstrap) in maximum likelihood (ML) phylogenetic tree. Quantitative real-time PCR (qRT-PCR) analysis showed that stressful environmental conditions markedly inhibited transcription levels of these two γ-CA genes. Low pH value (pH 7.5) significantly increased transcription level of UpγCA2 not UpγCA1 at 12 h, whereas high pH value (pH 8.5) significantly inhibited the transcription of these two γ-CA genes at 6 h. These findings enhanced our understanding on transcriptional regulation of γ-CA genes in response to environmental factors in U. prolifera.

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Abbreviations

CA:

Carbonic anhydrase

CO2 :

Carbon dioxide

HCO3 :

Bicarbonate anion

CCM:

CO2 concentrating mechanism

qRT-PCR:

Quantitative real-time PCR

ITS:

Internal transcribed spacer

LβH:

Left-handed parallel β helix

ML:

Maximum likelihood

MW:

Molecular weight

CDS:

Coding sequence

UTR:

Untranslated region

pI:

Isoelectric point

RACE:

Rapid amplification of cDNA ends

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Acknowledgements

The authors wish to thank Mengqiang Wang, Xingfeng Liu and Wei Luan for their assistance in algal collection and data analysis. This work was supported by the National Natural Science Foundation of China (No. 41876165), the Strategic Priority Research Program of Chinese Academy of Sciences (No. XDA23050302/XDA23050403/XDB42000000), the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (No. QYZDB-SSW-DQC023), the Major Scientific and Technological Innovation Project of Shandong Province (No. 2019JZZY020706), and the Earmarked Fund for Modern Agro-industry Technology Research System in Shandong Province of China (No. SDAIT-26-09).

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Contributions

FL, YW, YB and NC were responsible for the bioinformatics analysis. FL and YW wrote the manuscript. ML and SS identified and cultivated algal samples. FL and YB conceived the study. FL was responsible for research funding. All authors reviewed the manuscript.

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Correspondence to Feng Liu.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Informed consent was obtained from all individual participants included in the study.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Wang, Y., Liu, F., Liu, M. et al. Molecular cloning and transcriptional regulation of two γ-carbonic anhydrase genes in the green macroalga Ulva prolifera. Genetica 149, 63–72 (2021). https://doi.org/10.1007/s10709-020-00112-4

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  • DOI: https://doi.org/10.1007/s10709-020-00112-4

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