Plant and Cell Physiology, 2002, Vol. 43, No. 7 689-696
© 2002 Oxford University Press
Proteomic Analysis of Leaf Peroxisomal Proteins in Greening Cotyledons of Arabidopsis thaliana
1 Department of Cell Biology, National Institute for Basic Biology, Okazaki, 444-8585 Japan
2 Department of Molecular Biomechanics, School of Life Science, Graduate University for Advanced Studies, Okazaki, 444-8585 Japan
Leaf peroxisomes are present in greening cotyledons and contain enzymes of the glycolate pathway that functions in photorespiration. However, only a few leaf peroxisomal proteins, that is hydroxypyruvate reductase (HPR), glycolate oxidase (GO) and alanine:glyoxylate aminotransferase 1 (AGT1), have been characterized, and other functions in leaf peroxisomes have not been solved. To better understand the functions of leaf peroxisomes, we established a method to isolate leaf peroxisomes of greening cotyledons. We analyzed 53 proteins by MALDI-TOF MS and then identified 29 proteins. Among them, five proteins are related to the glycolate pathway, four proteins function in scavenging of hydrogen peroxide and additionally 20 novel leaf peroxisomal proteins were identified. In particular, protein kinases and protein phosphatase were first identified as peroxisomal proteins suggesting that protein phosphorylation is one of the regulatory mechanisms in leaf peroxisomes. Novel leaf peroxisomal proteins contained five PTS1-like proteins that have sequences where one amino acid is substituted with another one in PTS1 sequences. The PTS1 motif was suggested to have novel PTS1 sequences.
3 Corresponding author: E-mail, mikosome@nibb.ac.jp; Fax, +81-564-55-7505.
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