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PLANT PHYSIOLOGY , Vol 109, Issue 1 327-330, Copyright © 1995 by American Society of Plant Biologists

RAPID COMMUNICATIONS

Evidence That Plant K+ Channel Proteins Have Two Different Types of Subunits

H. Tang, A. C. Vasconcelos and G. A. Berkowitz
Plant Science Department, Cook College (H.T., G.A.B.), and Bureau of Biological Research, Nelson Biological Laboratories (A.C.V), Rutgers-The State University of New Jersey, New Brunswick, New Jersey 08903

Plant K+ channel proteins have been previously characterized as tetramers of membrane-spanning [alpha] subunit polypeptides. Recent studies have identified a 39-kD, hydrophilic polypeptide that is a structural component of purified animal K+ channel proteins. We have cloned and sequenced an Arabidopsis thaliana cDNA encoding a 38.4-kD polypeptide that has a sequence homologous to the animal K+ channel [beta] subunit. Southern and northern analyses indicate the presence of a gene encoding this cDNA in the Arabidopsis genome and that its transcription product is present in Arabidopsis cells. To our knowledge, this is the first report to document the presence of K+ channel [beta] subunits in plants.


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