Dear all! How to refine occupancies of mutually dependent structural fragments found in alternate conformations, but not consecutive in a sequence? E.g. I want to refine occupancies of two alternate conformations of residues 30 and 451 (see below the corresponding parts of a PDB file). Because of the nature of the structural disorder, an occupancy for altLoc A should be strictly the same in both fragments - the same is valid for altLoc B. Of course, the sum of occupancies for altLoc A and B should add up to 1. Thanks for your suggestions, Dalibor Milic ... ATOM 376 N AGLU A 30 23.241 86.975 31.961 0.52 17.13 N ATOM 377 N BGLU A 30 18.971 88.677 32.817 0.48 9.05 N ATOM 378 CA AGLU A 30 23.240 85.507 31.907 0.52 18.89 C ATOM 379 CA BGLU A 30 19.108 87.234 32.991 0.48 10.00 C ATOM 380 CB AGLU A 30 21.848 84.946 32.256 0.52 18.78 C ATOM 381 CB BGLU A 30 17.727 86.562 33.046 0.48 11.01 C ATOM 382 CG AGLU A 30 21.247 85.562 33.524 0.52 26.38 C ATOM 383 CG BGLU A 30 16.935 87.037 34.275 0.48 19.26 C ATOM 384 CD AGLU A 30 20.264 84.659 34.277 0.52 33.36 C ATOM 385 CD BGLU A 30 15.694 86.223 34.542 0.48 26.60 C ATOM 386 OE1AGLU A 30 19.437 83.968 33.620 0.52 31.85 O ATOM 387 OE1BGLU A 30 15.401 85.288 33.762 0.48 33.05 O ATOM 388 OE2AGLU A 30 20.310 84.678 35.535 0.52 29.12 O ATOM 389 OE2BGLU A 30 15.007 86.527 35.538 0.48 30.95 O ATOM 390 C AGLU A 30 23.750 84.946 30.575 0.52 18.22 C ATOM 391 C BGLU A 30 19.976 86.652 31.877 0.48 10.17 C ATOM 392 O AGLU A 30 24.319 83.853 30.534 0.52 19.40 O ATOM 393 O BGLU A 30 20.621 85.606 32.059 0.48 10.67 O ... ATOM 4627 N AALA A 451 31.047 82.837 22.335 0.52 18.30 N ATOM 4628 N BALA A 451 29.107 84.432 26.354 0.48 9.81 N ATOM 4629 CA AALA A 451 31.958 83.502 23.284 0.52 18.73 C ATOM 4630 CA BALA A 451 29.655 85.424 27.274 0.48 9.73 C ATOM 4631 CB AALA A 451 32.880 84.486 22.541 0.52 20.38 C ATOM 4632 CB BALA A 451 30.469 86.474 26.478 0.48 11.60 C ATOM 4633 C AALA A 451 31.176 84.206 24.406 0.52 18.79 C ATOM 4634 C BALA A 451 28.556 86.128 28.089 0.48 6.84 C ATOM 4635 O AALA A 451 30.019 84.593 24.197 0.52 18.25 O ATOM 4636 O BALA A 451 27.441 86.357 27.604 0.48 6.81 O ... -- Dalibor Milic, Dr. Sc. Laboratory of General and Inorganic Chemistry Department of Chemistry Faculty of Science University of Zagreb Horvatovac 102a HR-10000 Zagreb Croatia phone: +385 1 460 6377 fax: +385 1 460 6341 e-mail: [email protected]