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Plant and Cell Physiology, 2002, Vol. 43, No. 11 1390-1395
© 2002 Oxford University Press

Short Communications

The Degradation of the Large Subunit of Ribulose-1,5-bisphosphate Carboxylase/oxygenase into the 44-kDa Fragment in the Lysates of Chloroplasts Incubated in Darkness

Norimoto Kokubun, Hiroyuki Ishida1, Amane Makino and Tadahiko Mae

Laboratory of Plant Nutrition and Function, Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Sendai, 981-8555 Japan

Abstract

Lysates of chloroplasts isolated from naturally senescing wheat leaves were incubated in darkness. The 44-kDa fragment, lacking the N-terminal-side portion of the large subunit of ribulose-1,5-bisphosphate carboxylase/oxygenase (LSU), was found by immunoblotting with the LSU site-specific antibodies. Analysis of its N-terminal amino acid sequence indicated that the LSU was specifically cleaved at the peptide bond between Phe-40 and Arg-41. The site was located on the surface of the molecule and faced outward. Such cleavage of the LSU has not been previously reported. It is indicated that the cleavage was triggered by an unknown protease existing in chloroplasts.

Footnotes

1 Corresponding author: E-mail, hiroyuki@biochem.tohoku.ac.jp; Fax, +81-22-717-8765.


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