NDLI: Recruitment of Novel Calcium-Binding Proteins for Root Nodule Symbiosis in Medicago truncatula 1 [W] [OA]

Content Provider	PubMed Central
Author	Liu, Junqi Miller, Susan S. Graham, Michelle Bucciarelli, Bruna Catalano, Christina M. Janine, Sherrier D. Samac, Deborah A. Sergey, Ivashuta Fedorova, Maria Matsumoto, Peter Gantt, J. Stephen Vance, Carroll P.
Copyright Year	2006
Abstract	Legume rhizobia symbiotic nitrogen (N2) fixation plays a critical role in sustainable nitrogen management in agriculture and in the Earth's nitrogen cycle. Signaling between rhizobia and legumes initiates development of a unique plant organ, the root nodule, where bacteria undergo endocytosis and become surrounded by a plant membrane to form a symbiosome. Between this membrane and the encased bacteria exists a matrix-filled space (the symbiosome space) that is thought to contain a mixture of plant- and bacteria-derived proteins. Maintenance of the symbiosis state requires continuous communication between the plant and bacterial partners. Here, we show in the model legume Medicago truncatula that a novel family of six calmodulin-like proteins (CaMLs), expressed specifically in root nodules, are localized within the symbiosome space. All six nodule-specific CaML genes are clustered in the M. truncatula genome, along with two other nodule-specific genes, nodulin-22 and nodulin-25. Sequence comparisons and phylogenetic analysis suggest that an unequal recombination event occurred between nodulin-25 and a nearby calmodulin, which gave rise to the first CaML, and the gene family evolved by tandem duplication and divergence. The data provide striking evidence for the recruitment of a ubiquitous Ca2+-binding gene for symbiotic purposes.
Related Links	http://dx.doi.org/10.1104/pp.106.076711
Ending Page	177
Page Count	11
Starting Page	167
File Format	PDF
ISSN	00320889
e-ISSN	15322548
Journal	Plant Physiology
Issue Number	1
Volume Number	141
Language	English
Publisher	American Society of Plant Biologists
Publisher Date	2006-03-01
Access Restriction	Open
Rights Holder	American Society of Plant Biologists
Subject Keyword	Plant Science Genetics Physiology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Genetics Physiology Plant Science

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