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41.
Hiroyuki Konno Takumi Onuma Ikumi Nitanai Masaki Wakabayashi Shigekazu Yano Kenta Teruya Kenichi Akaji 《Bioorganic & medicinal chemistry letters》2017,27(12):2746-2751
Synthesis and evaluation of new scaffold phenylisoserine derivatives connected with the essential functional groups against SARS CoV 3CL protease are described. The phenylisoserine backbone was found by simulation on GOLD software and the structure activity relationship study of phenylisoserine derivatives gave SK80 with an IC50 value of 43 μM against SARS CoV 3CL R188I mutant protease. 相似文献
42.
Y Kiso Y Fujiwara T Kimura A Nishitani K Akaji 《International journal of peptide and protein research》1992,40(3-4):308-314
An efficient method for solid phase peptide synthesis was developed, which consists of N alpha-selective deprotection by dilute methanesulfonic acid, in situ neutralization and rapid coupling reaction using benzotriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate (BOP) or 2-(benzotriazol-1-yl)oxy-1,3- dimethylimidazolidinium hexafluorophosphate (BOI) reagent. Selective removal of the N alpha-Boc group by dilute methanesulfonic acid was of more advantage than removal by TFA in terms of stability of semipermanent protecting groups and suppression of undesired side reactions. The use of in situ neutralization and rapid coupling method reduced intramolecular aminolytic cyclization by shortening exposure of the deprotected nucleophilic amino group. A successful synthesis of porcine brain natriuretic peptide (pBNP) has been achieved using this efficient solid phase peptide synthesis scheme. 相似文献
43.
Synthesis of a membrane protein with two transmembrane regions. 总被引:1,自引:0,他引:1
Takeshi Sato Toru Kawakami Kenichi Akaji Hiroki Konishi Koji Mochizuki Toshimichi Fujiwara Hideo Akutsu Saburo Aimoto 《Journal of peptide science》2002,8(4):172-180
A membrane protein with two transmembrane domains was synthesized by means of the thioester method. The F1F0 ATP synthase subunit c (Sub.c), which consists of 79 amino acid residues (MW 8257), was chosen as a target. For synthetic purposes, two building blocks, Boc-[Lys34(Boc)]-Sub.c(1-38)-SCH2CH2CO-Ala and Sub.c(39-79), were synthesized via solid-phase methods using Boc chemistry. RP-HPLC purification conditions for the transmembrane peptide were examined. As a result, a combination of a mixture of formic acid, 1-propanol and water with a phenyl column was found to be useful for separating the transmembrane peptide. The purified building blocks were condensed in DMSO in the presence of silver chloride, 3,4-dihydro-3-hydroxy-4-oxo-1,2,3-benzotriazine (HOOBt), N,N-diisopropylethylamine to give the product, Sub.c, after removal of Boc groups (yield 16%). The yield of the condensation reaction could be improved to 23% by raising the reaction temperature to 50 degrees C, and to 26% when a mixture of chloroform and methanol was used as a solvent. 相似文献