Kabat E A, Wu T T, Bilofsky H
J Exp Med. 1980 Jul 1;152(1):72-84. doi: 10.1084/jem.152.1.72.
Amino acid sequences of rabbit light chains show considerable evidence of independent assortment of framework (FR) and complementarity-determining (CDR) segments. This suggests that they are coded for by independent genetic units (minigaenes) and that individual light chains are assembled somatically by recombining these units. Identical FR sets with multiple members generally comprise chains with different specificities, whereas identical CDR sets tend to have chains of a single specificity. A J segment, which, by analogy with mouse light chains, is made up of the last two residues of CDR3 plus all of FR4, contained 18 different sets and could contribute to diversity generated by CDR3. The longest segment, FR3, had a very large number of sets. Evidence is presented showing that the number of sets could be substantially reduced by permitting FR3 to be formed by two independently assorting segments comprising residues 57-68 and 69-88.
兔轻链的氨基酸序列显示出框架(FR)和互补决定(CDR)片段独立排列的大量证据。这表明它们由独立的遗传单位(微型基因)编码,并且个体轻链通过这些单位的重组在体细胞中组装。具有多个成员的相同FR集通常包含具有不同特异性的链,而相同的CDR集往往具有单一特异性的链。一个J片段,类似于小鼠轻链,由CDR3的最后两个残基加上所有的FR4组成,包含18个不同的集合,并且可能对CDR3产生的多样性有贡献。最长的片段FR3有非常多的集合。有证据表明,通过允许FR3由包含残基57 - 68和69 - 88的两个独立排列的片段形成,可以大幅减少集合的数量。