Plant Pathol J > Volume 21(1); 2005 > Article
The Plant Pathology Journal 2005;21(1):21-26.
DOI:    Published online March 31, 2005.
Intercellular Trafficking of Homeodomain Proteins
Seon Won Kim, Ju Yeon Moon, Jin Jung, Xiong Yan Chen, Chun Lin Shi, Yeong Gil Rim, Hey Jin Kwon, David Jackson, Raju Datla, Alain Joliot, Jae Yean Kim
Homeotic proteins have pivotal roles during the development of both plant and animals. Many homeotic proteins exert control over cell fate in cells where their genes are not expressed, i.e., in a non-cell autonomous manner. Cell-to-cell communication, which delivers critical information for position-dependent specification of cell fate, is an essential biological process in multicellular organisms. In plants, there are two pathways for intercellular communication that have been identified: the ligand/receptor-mediated apoplastic pathway and the plasmodesmata-mediated symplasmic pathway. Regulatory proteins and RNAs traffic symplasmically via plasmodesmata and play a critical role in intercellular communication. Thus, the non-cell autonomous function of homeotic proteins can be explained by the recent discovery of cell-to-cell trafficking of proteins or RNAs. This article specifically focuses on understanding the intercellular movement of homeodomain proteins, a family of homeotic proteins.
Key Words: cell-to-cell communication, homeodomain, intercellular trafficking, KNOTTED1, non-cell autonomous protein, plasmodesmata
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