A new widespread subclass of carbonic anhydrase in marine phytoplankton - Archive ouverte HAL Access content directly
Journal Articles The International Society of Microbiologial Ecology Journal Year : 2019

A new widespread subclass of carbonic anhydrase in marine phytoplankton

Abstract

Most aquatic photoautotrophs depend on CO2-concentrating mechanisms (CCMs) to maintain productivity at ambient concentrations of CO2, and carbonic anhydrase (CA) plays a key role in these processes. Here we present different lines of evidence showing that the protein LCIP63, identified in the marine diatom Thalassiosira pseudonana, is a CA. However, sequence analysis showed that it has a low identity with any known CA and therefore belongs to a new subclass that we designate as iota-CA. Moreover, LCIP63 unusually prefers Mn2+ to Zn2+ as a cofactor, which is potentially of ecological relevance since Mn2+ is more abundant than Zn2+ in the ocean. LCIP63 is located in the chloroplast and only expressed at low concentrations of CO2. When overexpressed using biolistic transformation, the rate of photosynthesis at limiting concentrations of dissolved inorganic carbon increased, confirming its role in the CCM. LCIP63 homologs are present in the five other sequenced diatoms and in other algae, bacteria, and archaea. Thus LCIP63 is phylogenetically widespread but overlooked. Analysis of the Tara Oceans database confirmed this and showed that LCIP63 is widely distributed in marine environments and is therefore likely to play an important role in global biogeochemical carbon cycling.
Fichier principal
Vignette du fichier
ISME Journal JENSEN.pdf (4.67 Mo) Télécharger le fichier
Origin Publisher files allowed on an open archive
Loading...

Dates and versions

hal-02176562 , version 1 (08-07-2019)

Licence

Identifiers

Cite

Stephen C. Maberly, Erik L Jensen, Romain Clément, Artemis Kosta, Brigitte Gontero. A new widespread subclass of carbonic anhydrase in marine phytoplankton. The International Society of Microbiologial Ecology Journal, 2019, ⟨10.1038/s41396-019-0426-8⟩. ⟨hal-02176562⟩

Collections

CNRS UNIV-AMU ANR
129 View
249 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More