We investigate the pressure-induced structural changes in the mature human immunodeficiency virus type 1 protease dimer (HIV-1 PR), using residual dipolar coupling (RDC) measurements in a weakly oriented solution. 1DNH RDCs were measured under high-pressure conditions for an inhibitor-free PR and an inhibitor-bound complex, as well as for an inhibitor-free multidrug resistant protease bearing 20 mutations (PR20). While PR20 and the inhibitor-bound PR were little affected by pressure, inhibitor-free PR showed …
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