High diffraction quality crystals of cucurmosin, a type I ribosome inactivating protein isolated from the sarcocarp of Cucurbita moschata (pumpkin), have been grown under newly optimised conditions. With in-house rota...High diffraction quality crystals of cucurmosin, a type I ribosome inactivating protein isolated from the sarcocarp of Cucurbita moschata (pumpkin), have been grown under newly optimised conditions. With in-house rotating anode X-ray source, these crystals diffract to 1.65 ?resolution which is much higher than that of the previously reported crystals that diffracted only to 3 ?resolution. The crystals belong to space group P212121 with cell parameters a = 41.5, b = 58.4 and c = 99.3 . Molecular replacement studies indicate that the cucurmosin structure is homologous to trichosanthin. The initial structural model has been obtained and the model fitting/ refinement is in progress.展开更多
基金Supported by the National Natural Science Foundation of China (39970872) NSF of Fujian province+1 种基金 and International Cooperation program of Fujian province to the State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Struct
文摘High diffraction quality crystals of cucurmosin, a type I ribosome inactivating protein isolated from the sarcocarp of Cucurbita moschata (pumpkin), have been grown under newly optimised conditions. With in-house rotating anode X-ray source, these crystals diffract to 1.65 ?resolution which is much higher than that of the previously reported crystals that diffracted only to 3 ?resolution. The crystals belong to space group P212121 with cell parameters a = 41.5, b = 58.4 and c = 99.3 . Molecular replacement studies indicate that the cucurmosin structure is homologous to trichosanthin. The initial structural model has been obtained and the model fitting/ refinement is in progress.
文摘目的制备由抗人类表皮生长因子受体2(HER-2/NEU)单克隆抗体曲妥珠单抗(Trastuzumab,简称T)与南瓜蛋白(Cucurmosin,简称CUS)偶联而成的免疫毒素,并进行鉴定。方法以N-琥珀酰胺-3-(2-吡啶二硫)丙酸酯(SPDP)为偶联剂,制备T-CUS,经过Ni Sepharose 6 Fast Flow和SP Sepharose 6 Fast Flow纯化后SDS-PAGE分析其纯度及成分,细胞ELISA法检测其对人乳腺癌BT-474细胞的结合能力。结果 SDSPAGE分析显示T-CUS免疫毒素成功构建,免疫毒素基本保留了对BT-474细胞的结合能力。结论利用SPDP可实现曲妥珠单抗与CUS的成功偶联。
