Li, Y., Darley, C.P., Ongaro, V., Fleming, A., Schipper, O., Baldauf, S.L. and McQueen-Mason, S.J. (2002) Plant expansins are a complex multigene family with an ancient evolutionary origin. Plant Physiology, 128 (3). pp. 854-864. ISSN 0032-0889
Expansins are a group of extracellular proteins that directly modify the mechanical properties of plant cell walls, leading to turgor-driven cell extension. Within the completely sequenced Arabidopsis genome, we identified 38 expansin sequences that fall into three discrete subfamilies. Based on phylogenetic analysis and shared intron patterns, we propose a new, systematic nomenclature of Arabidopsis expansins. Further phylogenetic analysis, including expansin sequences found here in monocots, pine (Pinus radiata, Pinus taeda), fern (Regnellidium diphyllum, Marsilea quadrifolia), and moss (Physcomitrella patens) indicate that the three plant expansin subfamilies arose and began diversifying very early in, if not before, colonization of land by plants. Closely related "expansin-like" sequences were also identified in the social amoeba, Dictyostelium discoidium, suggesting that these wall-modifying proteins have a very deep evolutionary origin.
|Institution:||The University of York|
|Academic Units:||The University of York > Biology (York)|
|Depositing User:||York RAE Import|
|Date Deposited:||25 Feb 2009 15:35|
|Last Modified:||04 Aug 2009 11:18|
|Publisher:||American Society of Plant Biologists|