Read e-book online Antigen Antibody Interactions PDF

By Charles DeLisi (auth.)

ISBN-10: 3540076972

ISBN-13: 9783540076971

ISBN-10: 3642930441

ISBN-13: 9783642930447

1. 1 association of the Immune process probably the most vital survival mechanisms of vertebrates is their skill to acknowledge and reply to the onslaught of pathogenic microbes to which they're conti- ously uncovered. the gathering of host cells and molecules fascinated about this reputation­ 12 reaction functionality constitutes its immune procedure. In guy, it includes approximately 10 cells 20 (lymphocytes) and 10 molecules (immunoglobulins). Its ontogenic improvement is c- strained by way of the requirement that or not it's in a position to responding to a virtually unlimited number of molecular configurations on overseas components, whereas at the same time final inert to these on self parts. It has therefore advanced to discriminate, with beautiful precision, among molecular styles. The international elements which result in a reaction, known as antigens, tend to be huge molecules resembling proteins and polysaccharides. The parts of those with which immunoglobulins have interaction are referred to as epitopes or determinants. a customary protein epitope may perhaps include a configuration shaped by means of the spatial preparations of 4 or 5 amino acids and feature an ordinary linear measurement of approximately 20 A.

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For this case it has not been possible to obtain a result which becomes asymptotically exact. 19. Then, keeping only the leading term a)! 19. 1 x 10 cm / sec. 008 Finally, it is possible to express the general solution for arbitrary time as an integral over the real axis. 7 were derived under local equilibrium conditions, their validity is actually only constrained by the more general condition that the time of the experiment be longer than the reciprocal of the -reverse rate constant. For example, in a twenty-hour experiment, even a reverse rate constant is slow as 10- 4 sec -1 satisfies this constraint, although such slow dissociations clearly would not satisfy local equilibrium conditions.

Increasing hinge flexibility also favors cross linking at the expense of intramolecular reaction. Thus, if cross linking is required for B cell triggering, these conditions would tend to favor activation' whereas the reverse conditions which shift the reaction pathways toward intramolecular reaction would tend to militate against it. The question then is whether too many intramolecular reactions merely passively block activation or do something more. This will be discussed elsewhere (DeLisi, 1976) since conjecture here would lead too far from the main theme of this chapter.

It is noteworthy that in both cases the relaxation time for the process 11/-) is linearly propor- tional to the antibody concentration in agreement with experimental observation. Thus, there are a number of conditions which yield relatively simple expressions for the relaxation times of the forward and reverse rate constants, and it is pertinent to ask whether any of these is relevant to the Hornick-Karush experiments. In attempting to provide an answer, an important experimental finding to consider is that the equilibrium constant, KOBS ' obtained under equilibrium conditions, was found to equal kf/k r to within a factor of two.

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Antigen Antibody Interactions by Charles DeLisi (auth.)

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