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Title: Expression activation and functional analysis of HLA 3, a putative inorganic carbon transporter in C hlamydomonas reinhardtii

Journal Article · · The Plant Journal
DOI:https://doi.org/10.1111/tpj.12788· OSTI ID:1400690
 [1];  [1];  [1];  [1];  [1]
  1. Department of Genetics, Development, and Cell Biology Iowa State University Ames IA 50011 USA

Summary The CO 2 concentrating mechanism (CCM) is a key component of the carbon assimilation strategy of aquatic microalgae. Induced by limiting CO 2 and tightly regulated, the CCM enables these microalgae to respond rapidly to varying environmental CO 2 supplies and to perform photosynthetic CO 2 assimilation in a cost‐effective way. A functional CCM in eukaryotic algae requires Rubisco sequestration, rapid interconversion between CO 2 and catalyzed by carbonic anhydrases (CAs), and active inorganic carbon (Ci) uptake. In the model microalga Chlamydomonas reinhardtii , a membrane protein HLA3 is proposed to be involved in active Ci uptake across the plasma membrane. In this study, we use an artificially designed transcription activator‐like effector ( dTALE ) to activate the expression of HLA3. The successful activation of HLA3 expression demonstrates dTALE as a promising tool for gene‐specific activation and investigation of gene function in Chlamydomonas . Activation of HLA3 expression in high CO 2 acclimated cells, where HLA3 is not expressed, resulted in increased Ci accumulation and Ci‐dependent photosynthetic O 2 evolution specifically in very low CO 2 concentrations, which confirms that HLA3 is indeed involved in Ci uptake, and suggests it is mainly associated with transport in very low CO 2 concentrations, conditions in which active CO 2 uptake is highly limited.

Sponsoring Organization:
USDOE
OSTI ID:
1400690
Journal Information:
The Plant Journal, Journal Name: The Plant Journal Vol. 82 Journal Issue: 1; ISSN 0960-7412
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 45 works
Citation information provided by
Web of Science

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