Volume 53, Issue 37 pp. 9812-9816
Communication

Synthesis of the Highly Glycosylated Hydrophilic Motif of Extensins

Dr. Akihiro Ishiwata

Corresponding Author

Dr. Akihiro Ishiwata

Synthetic Cellular Chemistry Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)

Synthetic Cellular Chemistry Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)Search for more papers by this author
Dr. Sophon Kaeothip

Dr. Sophon Kaeothip

ERATO glycotrilogy project, JST (Japan)

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Dr. Yoichi Takeda

Dr. Yoichi Takeda

ERATO glycotrilogy project, JST (Japan)

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Dr. Yukishige Ito

Corresponding Author

Dr. Yukishige Ito

Synthetic Cellular Chemistry Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)

ERATO glycotrilogy project, JST (Japan)

Synthetic Cellular Chemistry Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)Search for more papers by this author
First published: 15 July 2014
Citations: 33

We thank Dr. Hiroyuki Koshino (RIKEN Global Research Cluster) and his staff for technical help for technical help with ESI MS and CD, and Dr. Fumiaki Hayashi and Dr. Hui-ping Zhang (RIKEN Center for Life Science Technologies) for 900 MHz NMR measurements and are grateful to the Support Unit for Biomaterial Analysis (RIKEN Brain Science Institute) for tandem MS analysis. We also thank Ms. Akemi Takahashi for her kind technical assistance. This work was partly supported by Incentive Research Grant (2013) in RIKEN.

Graphical Abstract

Just a phase: Stereoselective synthesis of one of the highly glycosylated hydrophilic motifs of extensins has been completed. Key steps were a 2-naphthylmethyl ether-mediated intramolecular aglycon delivery to the stereoselective construction of the Ser(Galp1) and Hyp(Arafn) (n=1, 3, 4) fragments and Fmoc solid-phase peptide synthesis (SPPS) for the highly glycosylated pentapeptide motif.

Abstract

Extensin, the structural motif of plant extracellular matrix proteins, possesses a unique highly glycosylated, hydrophilic, and repeating Ser1Hyp4 pentapeptide unit, and has been proposed to include post-translational hydroxylation at proline residue and subsequent oligo-L-arabinosylations at all of the resultant hydroxyprolines as well as galactosylation at serine residue. Reported herein is the stereoselective synthesis of one of the highly glycosylated motifs, Ser(Galp1)-Hyp(Araf4)-Hyp(Araf4)-Hyp(Araf3)-Hyp(Araf1). The synthesis has been completed by the application of 2-(naphthyl)methylether-mediated intramolecular aglycon delivery to the stereoselective construction of the Ser(Galp1) and Hyp(Arafn) fragments as the key step, as well as Fmoc solid-phase peptide synthesis for the backbone pentapeptide.

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