Approaches toward High-Mannose-Type Glycan Libraries.
Asparagine-linked (N-linked) sugar chains are widely found in the rough endoplasmic reticulum (ER), which has attracted renewed attention because of its participation in the glycoprotein quality control process. In the ER, newly formed glycoproteins are properly folded to higher-order structures by the action of a variety of lectin chaperones and processing enzymes and are transported into the Golgi, while terminally misfolded glycoproteins are carried into the cytosol for degradation. A group of proteins related to this system are known to recognize subtle differences in the high-mannose-type oligosaccharide structures of glycoproteins; however, their molecular foundations are still unclear. In order to gain a more precise understanding, our group has established a strategy for the systematic synthesis of high-mannose-type glycans. More recently, we have developed "top-down" chemoenzymatic approaches that allow expeditious access to theoretically all types of high-mannose glycans. This strategy comprehensively delivered 37 high-mannose-type glycans, including G1M9-M3 glycans, and opened up the possibility of the elucidation of structure-function relationships with a series of high-mannose-type glycans.
Japan Science and Technology Agency (JST), ERATO Ito Glycotrilogy Project, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.|SUNTORY Bioorganic Research Institute, 8-1-1 Seikadai, Seika-cho Soraku-gun, Kyoto, 619-0284, Japan.
Kohki
K
Fujikawa
Japan Science and Technology Agency (JST), ERATO Ito Glycotrilogy Project, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
Akira
A
Seko
Japan Science and Technology Agency (JST), ERATO Ito Glycotrilogy Project, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.|Department of Biotechnology, College of Life Sciences, Ritsumeikan University, 1-1-1 Noji-higashi, Kusatsu, Shiga, 525-8577, Japan.
Yoichi
Y
Takeda
Japan Science and Technology Agency (JST), ERATO Ito Glycotrilogy Project, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.|Synthetic Cellular Chemistry Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
Yukishige
Y
Ito
D002236:Carbohydrate Conformation; D008358:Mannose / Q000737:chemistry*; D011134:Polysaccharides / Q000138:chemical synthesis / Q000737:chemistry*
D011134:Polysaccharides; D008358:Mannose
carbohydrates; glycoconjugates; glycoproteins; glycosylation; protein folding