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. 1974 Jul;141(1):1–13. doi: 10.1042/bj1410001

Amino acid sequence of the N-terminal 139 residues of light chain derived from a homogeneous rabbit antibody

Jean-Claude Jaton 1
PMCID: PMC1168043  PMID: 4141892

Abstract

The amino acid sequence of the N-terminal 139 residues of the L (light) chain derived from a homogeneous rabbit antibody (designated BS-1) to type III pneumococci was determined. A combination of methods involving tryptic cleavage restricted to the 2 arginine residues of the molecule and mild acid hydrolysis of a labile peptide bond between the V (variable) and C (constant) regions of the L chain (Fraser et al., 1972) allowed the isolation of two large peptides comprising the entire V region (residues 1–109); these peptides were suitable for automated Edman degradation. The complete sequence analysis of the V region was carried out with only 4μmol of L chain. This material was homogeneous, although minor variant sequences, if present at the 10% value, would not have been detected. The L chain contains 3 intrachain disulphide bridges, whose pairing was established by diagonal electrophoresis: there is one V-region bridge between positions 23 and 88 and one C-region bridge between positions 134 and 194; the third one connects V and C domains between positions 80 and 171. When compared with the basic sequence of human κ chains, rabbit L chain BS-1 appears to be more similar to the VKI prototype sequence than to VKII or VKIII sequences, where VKI, VKII and VKIII represent subgroups I, II and III respectively of V regions of κ light chains. The V regions of rabbit heavy and light chains are homologous to each other. The presence of two clusters of 3 glycine residues in positions 94–96 and 99–101 respectively is remarkable. Residues 94–96 may be related to antibody complementarity whereas residues 99–101 function probably as a pivot permitting the combining region of the L chain to make optimal contact with the antigenic determinant (Wu & Kabat, 1970).

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Selected References

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