C10-Oe-N-(4-azido-5-125iodo salicyloyl)-β-alanyl-β alanyl ryanodine (Az-βAR), a novel photo-affinity ligand for the ryanodine binding site
作者:Keshore R. Bidasee、Henry R. Besch、Sangyeol Kwon、Jeffrey T. Emmick、Kurt T. Besch、Koert Gerzon、Rod A. Humerickhouse
DOI:10.1002/jlcr.2580340106
日期:1994.1
A high affinity, photoactivatable, radio-iodinated ligand for the ryanodine binding site(s) of the sarcoplasmic reticulum calcium-release-channel, C10-Oeq-N-(4-azido-5-125iodo salicyloyl)-β-alanyl-β-alanyl ryanodine (Az-βAR), was synthesized at a specific activity of 1400mCi/mmol. Prepared by condensing the versatile synthon, N-(4-azido-5125iodo salicyloyl)-β-alanine with C10-Oeq-β-alanyl ryanodine, Az-βAR, like [3H] ryanodine, does not demonstrate saturation binding kinetics. 127Az-βAR exhibits an IC50 of 27.2 ± 2 × 10−9 M (mean ± SD) compared to ryanodine's 6.2 ± 0.4 × 10−9 M for the ryanodine receptor/calcium release channel of sarcoplasmic reticulum vesicles isolated from rabbit skeletal muscle.
我们合成了一种与肌质网钙释放通道的雷诺丁结合位点具有高亲和力、可光激活的放射性碘化配体--C10-Oeq-N-(4-叠氮-5-125 碘水杨酰)-β-丙氨酰-β-丙氨酰雷诺丁(Az-βAR),其比活度为 1400mCi/mmol。Az-βAR 是由多功能合成物 N-(4-叠氮-5125 碘水杨酰)-β-丙氨酸与 C10-Oeq-β-丙氨酰雷诺丁缩合而成,与 [3H] 雷诺丁一样,Az-βAR 不显示饱和结合动力学。127Az-βAR 对分离自家兔骨骼肌的肌质网囊泡的雷诺丁受体/钙释放通道的 IC50 为 27.2 ± 2 × 10-9 M(平均值 ± SD),而雷诺丁的 IC50 为 6.2 ± 0.4 × 10-9 M。