作者
Ana Karina Hochmal, Karen Zinzius, Ratana Charoenwattanasatien, Philipp Gäbelein, Risa Mutoh, Hideaki Tanaka, Stefan Schulze, Gai Liu, Martin Scholz, André Nordhues, Jan Niklas Offenborn, Dimitris Petroutsos, Giovanni Finazzi, Christian Fufezan, Kaiyao Huang, Genji Kurisu, Michael Hippler
发表日期
2016/6/14
期刊
Nature communications
卷号
7
期号
1
页码范围
11847
出版商
Nature Publishing Group UK
简介
Calcium (Ca2+) and redox signalling play important roles in acclimation processes from archaea to eukaryotic organisms. Herein we characterized a unique protein from Chlamydomonas reinhardtii that has the competence to integrate Ca2+- and redox-related signalling. This protein, designated as calredoxin (CRX), combines four Ca2+-binding EF-hands and a thioredoxin (TRX) domain. A crystal structure of CRX, at 1.6 Å resolution, revealed an unusual calmodulin-fold of the Ca2+-binding EF-hands, which is functionally linked via an inter-domain communication path with the enzymatically active TRX domain. CRX is chloroplast-localized and interacted with a chloroplast 2-Cys peroxiredoxin (PRX1). Ca2+-binding to CRX is critical for its TRX activity and for efficient binding and reduction of PRX1. Thereby, CRX represents a new class of Ca2+-dependent ‘sensor-responder’ proteins. Genetically engineered …
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AK Hochmal, K Zinzius, R Charoenwattanasatien… - Nature communications, 2016