@ARTICLE{TreeBASE2Ref31780, author = {Kanae Nishii and Michael M?ller and Hidetoshi Iida}, title = {Mix and match: patchwork domain evolution of the land plant-specific Ca2+-permeable mechanosensitive channel MCA}, year = {2021}, keywords = {MCA, mechanosensitive channel, PANTHER, Pfam, PLAC8, protein domain}, doi = {}, url = {http://}, pmid = {}, journal = {PLoS One}, volume = {}, number = {}, pages = {}, abstract = {Multidomain proteins can have a complex evolutionary history that may involve de novo domain evolution, recruitment and / or recombination of existing domains and domain losses. Here, the domain evolution of the plant-specific Ca2+-permeable mechanosensitive channel protein, MID1-COMPLEMENTING ACTIVITY (MCA), was investigated. MCA, a multidomain protein, possesses a Ca2+-influx-MCAfunc domain and a PLAC8 domain. Profile Hidden Markov Models (HMMs) of domains were assessed in 25 viridiplantae proteomes. While PLAC8 was detected in plants, animals, and fungi, MCAfunc was found in streptophytes but not in chlorophytes. Full MCA proteins were only found in embryophytes. Maximum likelihood (ML) analyses revealed that the MCAfunc domain first appeared in E3 ubiquitin ligases-like proteins of charophytes, suggesting the domain arose in the common ancestor of streptophytes. The PLAC8 domain showed similarity to Plant Cadmium Resistance (PCR) genes, and the coupling of MCAfunc and PLAC8 seemed to represent a single evolutionary event. This combination is unique in MCA, and does not exist in other plant mechanosensitive channels. Within angiosperms, gene duplications increased the number of MCAs. Considering their role in mechanosensing in roots, MCA might be instrumental for the rise of land plants. This study provides a textbook example of de novo domain emergence, recombination, duplication, and losses, leading to the convergence of function of proteins in plants.} }

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