3â²-(α-L-Aminoacylamido)deoxyadenosines are ribosomal A-site binders and mimic the nascent peptide accepting 3â²-terminus of aminoacyl transfer RNA. Their α-amino groups exhibit intrinsic basicities in bulk water that differ by up to 1.8 pKa units. Only the neutral form of these nucleophiles can be active during ribosomal peptidyl transfer catalysis.
3²-(α-L-
氨基酰
氨基)脱氧
腺苷是
核糖体A位点结合剂,可模拟新生肽接受
氨基酰基转移RNA的3²-末端。它们的α-
氨基在大量
水中表现出不同的内在碱性,差异可达1.8 pKa单位。在
核糖体肽转移催化过程中,只有这些亲核物质的中性形式才能发挥活性。