Novel design and synthesis of a radioiodinated glycolipid analog as an acceptor substrate for<i>N</i>-acetylglucosaminyltransferase V
作者:Kenji Arimitsu、Hiroyuki Kimura、Tetsuya Kajimoto、Masahiro Ono、Yoshiro Ohmomo、Masayuki Yamashita、Manabu Node、Hideo Saji
DOI:10.1002/jlcr.3063
日期:2013.9
Guided by the known molecular recognition interactions between N-acetylglucosaminyltransferase V (GnT-V) and certain synthetic substrates, we synthesized a radiolabeled double-stranded glycolipid composed of a long-chain alkyl unit and a radioiodinated phenylalkyl unit, [125I]-2-[N-(2-hydroxy-3-hexadecyloxy)propyl-15-(4-iodophenyl)pentadecanecarboxamido]ethyl 2-acetamido-2-deoxy-β-d-glucopyranosyl-(1→2)-α-d-mannopyranosyl-(1→6)-β-d-glucopyranoside ([125I]2), as a novel intravital glycolipid mimic substrate of GnT-V. The radioactive iodine (125I) was incorporated via iododestannylation of the phenyltributyltin derivative, 2-[N-(2-acetoxy-3-hexadecyloxy)propyl-15-(4-tributylstannylphenyl)pentadecanecarboxamido]ethyl 3,4,6-tri-O-acetyl-2-acetamido-2-deoxy-β-d-glucopyranosyl-(1→2)-3,4,6-O-acetyl-α-d-mannopyranosyl-(1→6)-2,3,4-tri-O-acetyl-β-d-glucopyranoside (26). Subsequent deacetylation at the final step afforded [125I]2.
在已知的 N-乙酰葡糖胺基转移酶 V(GnT-V)与某些合成底物之间的分子识别相互作用的指导下,我们合成了一种放射性标记的双链糖脂,它由一个长链烷基单元和一个放射性碘化苯基烷基单元组成、[125I]-2-[N-(2-羟基-3-十六烷氧基)丙基-15-(4-碘苯基)十五烷甲酰胺基]乙基 2-乙酰氨基-2-脱氧-β-d-吡喃葡萄糖基-(1→2)-α-d-吡喃甘露糖基-(1→6)-β-d-吡喃葡萄糖苷([125I]2),作为一种新型的 GnT-V 体内糖脂模拟底物。3,4,6-O-三乙酰基-2-乙酰胺基-2-脱氧-β-d-吡喃葡萄糖基-(1→2)-3,4,6-O-乙酰基-α-d-吡喃甘露糖基-(1→6)-2,3,4-O-三乙酰基-β-d-吡喃葡萄糖苷 (26)。随后在最后一步进行脱乙酰化,得到[125I]2。