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0342919547
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note
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H3, respectively, resulting in a Phe at this position. Residue H100, which provides one of the walls of the cavity, arises from the DJ junction; it is an Arg in 1E9 and 39-A11 and a Trp in DB3. The H97 residue (Thr in 1E9, Tyr in DB3, and Arg in 39-A11) interacts primarily with the linker moiety in the 1E9 and 39-A11 structures, whereas in DB3 it provides a lid over one end of the hydrophobic cavity.
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0343354807
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note
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3CN to give 7 (73%). All new compounds gave satisfactory spectroscopic data.
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36
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0342919548
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note
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2 bleaching at 606 nm. Initial velocities were determined at several concentrations of one substrate while the concentration of the other was kept constant. The uncatalyzed reaction was carried out under identical conditions and also in acetonitrile.
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m values. The free energy of binding of transition state 5 is -8.9 kcal/mol. Thus, the predicted activation energy of the cycloaddition is lowered 5.7 kcal/mol relative to that in water (6).
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with a probe radius of 1.4 Å, and the volume enclosed in each surface was then computed. The gap volume is taken as the difference between the volume of the complex and the sum of the volumes of the antibody and the antigen. Gap index is the gap volume divided by the buried surface area
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Supported by NIH grants CA27489 (I.A.W.) and GM38273 (D.H.) and NSF grant CHE-9616772 (K.N.H.). We thank T. Horton, N. Jiang, and M. Auditor for technical assistance; the staff of SSRL beamline 9-1; R. A. Lerner, A. Heine, and D. J. Edwards for helpful discussions; the referees for helpful comments; N. R. Klinman for advice on germ line gene analysis; and K. Renner for computational assistance.
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