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Science 11 August 2006:
Vol. 313. no. 5788, pp. 842 - 845
DOI: 10.1126/science.1128436
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Reports

Dodeca-CLE Peptides as Suppressors of Plant Stem Cell Differentiation

Yasuko Ito,1* Ikuko Nakanomyo,1* Hiroyasu Motose,1{dagger} Kuninori Iwamoto,1 Shinichiro Sawa,1 Naoshi Dohmae,2 Hiroo Fukuda1{ddagger}

In plants and animals, small peptide ligands that signal in cell-cell communication have been suggested to be a crucial component of development. A bioassay of single-cell transdifferentation demonstrates that a dodecapeptide with two hydroxyproline residues is the functional product of genes from the CLE family, which includes CLAVATA3 in Arabidopsis. The dodecapeptide suppresses xylem cell development at a concentration of 10–11 M and promotes cell division. An application, corresponding to all 26 Arabidopsis CLE protein family members, of synthetic dodecapeptides reveals two counteracting signaling pathways involved in stem cell fate.

1 Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
2 Biomolecular Characterization Team, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.

* These authors contributed equally to this work.

{dagger} Present address: Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro-ku, Tokyo 153-8902, Japan.

{ddagger} To whom correspondence should be addressed. E-mail: fukuda{at}biol.s.u-tokyo.ac.jp

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