Determination of <i>α</i>-1,3-Linked Mannose Residue in the Cell Wall Mannan of <i>Candida tropicalis</i>NBRC 1400 Strain

• 作者: Akito Ishiyama Hidemitsu Kobayashi Hiroko Oyamada Takayoshi Yamada Takuya Kuraoka Yukiko Ogawa
• 来源期刊: 微生物学(英文)
• 学科: 化学
• 关键词: Candida tropicalis Pathogenic Yeast Cell WALL MANNAN Antigenic Oligomannosyl Side Chain Acetolysis α-1 3-Linked MANNOSE RESIDUE
• 年，卷（期）: 2020,（1）
• 页码范围: 14-26
• 页数: 13页
• 分类号: O64

摘要

To investigate the chemical structure of cell wall mannan obtained from pathogenic yeast, Candida tropicalis NBRC 1400 (former antigenic standard strain, IFO 1400). As a result of two-dimensional NMR analysis, it was shown that the mannan of this strain is composed of α-1,6-, α-1,3-, α-1,2- and β-1,2-linked mannose residues. In this research, the mannan was subjected to three degradation procedures, acid-treatment, α-mannosidase, and acetolysis under two conditions in order to determine the chemical structure of the antigenic oligomannosyl side chains in this molecule. The 1H-nuclear magnetic resonance spectra of resultant oligosaccharides, pentaose and hexaose, demonstrated the existence of the oligomannosyl side chains corresponding to Manα1-3Manα1-2Manα1-2Manα1-2Man and Manα1-3Manα1-2Manα1-2Manα1-2Manα1-2Man, respectively, which have previously also been found in Candida albicans serotype A strain mannans. These findings indicate that C. tropicalis and C. albicans serotype A have no significant difference in the chemical structure of these cell wall mannans. Therefore, it can be interpreted that it is extremely difficult to distinguish both species by targeting the antigenic group in these mannans.