Journal Article

Phytosulfokine-<b>α</b>, a Peptide Growth Factor Found in Higher Plants: Its Struc-ture, Functions, Precursor and Receptors

Heping Yang, Yoshikatsu Matsubayashi, Hidetoshi Hanai and Youji Sakagami

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 41, issue 7, pages 825-830
Published in print July 2000 | ISSN: 0032-0781
Published online July 2000 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcd009
Phytosulfokine-α, a Peptide Growth Factor Found in Higher Plants: Its Struc-ture, Functions, Precursor and Receptors

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  • Molecular and Cell Biology
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Phytosulfokine-α, a sulfated pentapeptide growth factor universally found in both monocotyledons and dicotyledons, strongly promotes proliferation of plant cells in culture. It is similar to animal polypeptide hormones in that it is processed from a larger precursor, preprophytosulfokine, although the putative processing sites do not conform to consensus sequences for endoproteolytic processing sites flanking animal prohormones. Like the animal preprohormones, preprophytosulfokine also has a signal peptide at the N-terminus for targeting to secretory pathways. The preprophytosulfokine gene has been confirmed to be expressed in vivo as well as in vitro.

Keywords: Key words: Phytosulfokine-α — Plant cell proliferation — Plant peptide growth factor — Preprophytosulfokine — Tyrosine-sulfated protein — Tyrosylprotein sulfotransferase.; Abbreviations: CM, conditioned medium; OsPSK, Oryza sativa phytosulfokine gene; PSK, phytosulfokine; PP-PSK, preprophytosulfokine.

Journal Article.  3791 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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