作者:Andrea Vescovi、Andrea Knoll、Ulrich Koert
DOI:10.1039/b303249n
日期:——
THFâgramicidin hybrids 2â4 with the L-THF amino acid 1 in positions 11 and 12 and compounds 5â8 with the D-THF amino acid ent-1 in positions 10 and 11 were synthesized and their ion channel properties were studied by single-channel-current analysis. The replacement of positions 11 and 12 by the L-THF amino acid 1 gave a strongly reduced channel performance. In contrast, replacement of positions 10 and 11 by the D-THF amino acid ent-1 gave rise to new and interesting channel properties. For the permeability ratios, the ion selectivity shifts from Eisenman I towards Eisenman III selectivity and the channels display ms-dynamics. Most remarkable is the asymmetric compound 8, which inserts selectively into a DPhPC membrane and displays voltage-directed gating dynamics.
通过单通道电流分析研究了在第11位和第12位含有L-THF氨基酸1的THFâgramicidin杂化物2â4和在第10位和第11位含有D-THF氨基酸ent-1的化合物5â8的离子通道特性。用 L-THF 氨基酸 1 取代位置 11 和 12 会大大降低通道性能。相反,用 D-THF 氨基酸 ent-1 替换位置 10 和 11 会产生新的有趣的通道特性。就渗透率比率而言,离子选择性从艾森曼 I 型转向艾森曼 III 型,通道显示出毫秒动力学。最引人注目的是不对称化合物 8,它能选择性地插入 DPhPC 膜,并显示出电压定向门控动力学。