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Abstract Detail


Genome Evolution

Zhang, Xue-Cheng [1], Wu, Xiaolei [1], Findley, Seth [1], Wan, Jinrong [1], Libault, Marc [1], Nguyen, Henry [1], Cannon, Steven [2], Stacey, Gary [1].

Molecular evolution of LysM type receptor-like kinases in plants.

The LysM domain is an ancient and ubiquitous protein module that binds peptidoglycan and structurally related molecules. A genomic survey in a large number of species spanning all kingdoms reveals that the combination of LysM and receptor kinase domains is present exclusively in plants. However, the particular biological functions and molecular evolution of this gene family remain largely unknown. We show that the LysM domains in plant LysM proteins are highly diversified and that a minimum of six distinct types of LysM motifs exist in plant LysM kinase proteins and five additional types of LysM motifs exist in non-kinase plant LysM proteins. Further, motif similarities suggest that plant LysM motifs are ancient. Although phylogenetic signals are not sufficient to resolve the earliest relationships, plant LysM motifs may have arisen through common ancestry with LysM motifs in other kingdoms. Within the plants, the gene family has evolved through local and segmental duplications. The family has undergone further duplication and diversification in legumes, where some LysM kinase genes function as receptors for bacterial nodulation factor. Two pairs of homeologous regions were identified in soybean based on microsynteny and fluorescence in situ hybridization. Expression data show that most plant LysM kinase genes are expressed predominantly in the root and that orthologous LysM kinase genes share similar tissue expression patterns. We also examined synteny around plant LysM kinase genes to help reconstruct scenarios for the evolution of this important gene family.


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1 - Univ. of Missouri-Columbia
2 - Iowa State University

Keywords:
LysM
receptor kinase
molecular evolution.

Presentation Type: Plant Biology Abstract
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P40022
Abstract ID:2701


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