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THE PLANT CELL, Vol 8, Issue 9 1601-1611, Copyright © 1996 by American Society of Plant Biologists

RESEARCH ARTICLES

Targeting and Processing of a Chimeric Protein with the N-Terminal Presequence of the Precursor to Glyoxysomal Citrate Synthase

A. Kato, M. Hayashi, M. Kondo and M. Nishimura
Department of Cell Biology, National Institute for Basic Biology, Okazaki 444, Japan

Glyoxysomal citrate synthase in pumpkin is synthesized as a precursor that has a cleavable presequence at its N-terminal end. To investigate the role of the presequence in the transport of the protein to the microbodies, we generated transgenic Arabidopsis plants that expressed [beta]-glucuronidase with the N-terminal presequence of the precursor to the glyoxysomal citrate synthase of pumpkin. Immunogold labeling and cell fractionation studies showed that the chimeric protein was transported into microbodies and subsequently was processed. The chimeric protein was transported to functionally different microbodies, such as glyoxysomes, leaf peroxisomes, and unspecialized microbodies. These observations indicated that the transport of glyoxysomal citrate synthase is mediated by its N-terminal presequence and that the transport system is functional in all plant microbodies. Site-directed mutagenesis of the conserved amino acids in the presequence caused abnormal targeting and inhibition of processing of the chimeric protein, suggesting that the conserved amino acids in the presequence are required for recognition of the target or processing.


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