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RESEARCH COMMUNICATION
1 Division of Applied Life Science (BK21 program), Environmental Biotechnology National Core Research Center, PMBBRC, Gyeongsang National University, Jinju 660-701, Korea; 2 Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, USA
Cell-to-cell trafficking of regulatory proteins is a novel mechanism for communication during cell fate specification in plants. Although several developmental proteins traffic cell-to-cell, no signals that are both necessary and sufficient for this function in developmental proteins have been described. We developed a novel trafficking assay using trichome rescue in Arabidopsis. Fusion to KNOTTED1 (KN1) conferred gain-of-trafficking function to the cell-autonomous GLABROUS1 (GL1) protein. We show that the KNOX homeodomain (HD) is necessary and sufficient for intercellular trafficking, identifying a novel function for the HD as the minimal sequence required for trafficking of KN1 and its associated mRNA.
[Keywords: KNOX homeodomain; trichome; trafficking signal; Glabrous 1; knotted1]
Received December 7, 2004; revised version accepted February 18, 2005.
3 E-MAIL kimjy{at}nongae.gsnu.ac.kr; FAX 82-55-759-9363.
4 E-MAIL jacksond{at}cshl.edu; FAX (516) 367-8369.
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