The influence of varied amide bond positions on hydraphile ion channel activity
作者:Michelle E. Weber、Wei Wang、Sarah E. Steinhardt、Michael R. Gokel、W. Matthew Leevy、George W. Gokel
DOI:10.1039/b510863m
日期:——
Hydraphile compounds have been prepared in which certain of the amine nitrogens have been replaced by amide residues. The amide bonds are present either in the sidearm, the side chain, or the central relay. Sodiumcationtransport through phospholipid vesicles mediated by each hydraphile was assessed. All of the amide-containing hydraphiles showed increased levels of Na(+) transport compared to the
Enhancement of cation transport in synthetic hydraphile channels having covalently-linked headgroups
作者:Hossein Shabany、George W. Gokel
DOI:10.1039/b005436o
日期:——
A novel, pentamacrocyclic host molecule has been prepared in which four symmetry-equivalent diazacrown ethers lead to a dramatic enhancement in Na+ transport, across a phospholipid bilayer, relative to open-chained analogs lacking the fourth crown.
A family of hydraphile ionophores has been prepared in which various approximately CH(2)N approximately to approximately CON approximately replacements have been made to assess the effect on Na(+) transport through phospholipid bilayers. When the central relay (see graphical abstract) was a third macrocycle, symmetrical carbonyl for methylene replacements enhanced activity, but the presence of four or six amide residues diminished transport. When a pair of amides was incorporated into compounds having a 4,4'-bipiperidyl central relay, both significant increases and decreases were observed depending upon the amide positions. The presence of amides alters both the donor group type and strength and the conformation of the structural unit in which it occurs. These changes are shown to depend on the liposomes in which the Na(+) release studies were conducted. These changes are shown to affect the toxicity of the hydraphiles to E. coli.