The pKa values of the three histidine residues in the Fv fragment (variable region of the heavy and light chains) of the mouse myeloma protein MOPC 315, measured by high resolution n.m.r. (nuclear magnetic resonance), are 5.9, 6.9 and 8.2. The perturbation of the pKa of one of the histidines (pKa 6.9) on the addition of hapten and the narrow linewidth of its proton resonances suggests that it is at the edge of the combining site. References to the model of the Fv fragment [Padlan, Davies, Pecht, Givol & Wright (1976) Cold Spring Harbor Symp. Quant. Biol. 41, in the press] allows assignment of the three histidine residues, histidine-102H, histidine-97L and histidine-44L. The determination of the pKa of the phosphorus group, by 31P n.m.r., of a homologous series of Dnp- and Tnp- (di- and tri-nitrophenyl) haptens has located a positively charged residue. Molecular-model studies on the conformations of these haptens show that the residue is at the edge of the site. The model suggests that the positively charged residue is either arginine-95L or lysine-52H.
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August 1977
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Research Article|
August 01 1977
Specificity of interactions of hapten side chains with the combining site of the myeloma protein MOPC 315
Publisher: Portland Press Ltd
Online ISSN: 1470-8728
Print ISSN: 0264-6021
© 1977 London: The Biochemical Society
1977
Biochem J (1977) 165 (2): 227–235.
Citation
S Wain-Hobson, S K Dower, P Gettins, D Givol, A C McLaughlin, I Pecht, C A Sunderland, R A Dwek; Specificity of interactions of hapten side chains with the combining site of the myeloma protein MOPC 315. Biochem J 1 August 1977; 165 (2): 227–235. doi: https://doi.org/10.1042/bj1650227
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