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Characterization of plant proteins that interact with cowpea mosaic virus ‘60K’ protein in the yeast two-hybrid system

Laboratory of Molecular Biology, Wageningen University, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands¹

Author for correspondence: Joan Wellink. Fax +31 31 7483584. e-mail joan.wellink{at}mac.mb.wau.nl

Cowpea mosaic virus (CPMV) replication occurs in close association with small membranous vesicles in the host cell. The CPMV RNA1-encoded 60 kDa nucleotide-binding protein (‘60K’) plays a role in the formation of these vesicles. In this study, five cellular proteins were identified that interacted with different domains of 60K using a yeast two-hybrid search of an Arabidopsis cDNA library. Two of these host proteins (termed VAP27-1 and VAP27-2), with high homology to the VAP33 family of SNARE-like proteins from animals, interacted specifically with the C-terminal domain of 60K and upon transient expression colocalized with 60K in CPMV-infected cowpea protoplasts. eEF1-, picked up using the central domain of 60K, was also found to colocalize with 60K. The possible role of these host proteins in the viral replicative cycle is discussed.

This article has been cited by other articles:

				S. Kagiwada and R. Zen Role of the Yeast VAP Homolog, Scs2p, in INO1 Expression and Phospholipid Metabolism J. Biochem., April 1, 2003; 133(4): 515 - 522. [Abstract] [Full Text] [PDF]