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. 1989 Mar;89(3):910–917. doi: 10.1104/pp.89.3.910

Phase-Specific Polypeptides and Poly(A)+ RNAs during the Cell Cycle in Synchronous Cultures of Catharanthus roseus Cells 1

Hiroaki Kodama 1,2, Naoto Kawakami 1,2,2, Akira Watanabe 1,2, Atsushi Komamine 1,2
PMCID: PMC1055943  PMID: 16666641

Abstract

This study shows an overall analysis of gene expression during the cell cycle in synchronous suspension cultures of Catharanthus roseus cells. First, the cellular cytoplasmic proteins were fractionated by two-dimensional gel electrophoresis and visualized by staining with silver. Seventeen polypeptides showed qualitative or quantitative changes during the cell cycle. Second, the rates of synthesis of cytoplasmic proteins were also investigated by autoradiography by labeling cells with [35S]methionine at each phase of the cell cycle. The rates of synthesis of 13 polypeptides were found to vary during the cell cycle. The silverstained electrophoretic pattern of proteins in the G2 phase in particular showed characteristic changes in levels of polypeptides, while the rates of synthesis of polypeptides synthesized during the G2 phase did not show such phase-specific changes. This result suggests that posttranslational processing of polypeptides occurs during or prior to the G2 phase. In the G1 and S phases and during cytokinesis, several other polypeptides were specifically synthesized. Finally, the variation of mRNAs was analyzed from the autoradiograms of in vitro translation products of poly(A)+ RNA isolated at each phase. Three poly(A)+ RNAs increased in amount from the G1 to the S phase and one poly (A)+ RNA increased preferentially from the G2 phase to cytokinesis.

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