| CONJOINED RIGID BODY/TORSION ANGLE DYNAMICS |
THE STRUCTURES WERE CALCULATED BY CONJOINED RIGID BODY/TORSION ANGLE DYNAMICS (SCHWIETERS & CLORE (2001) J.MAGN.RESON 152, 288-302). THE TARGET FUNCTIONS COMPRISES TERMS FOR NOE RESTRAINTS, SIDECHAIN TORSION ANGLE RESTRAINTS, RESIDUAL DIPOLAR COUPLING RESTRAINTS (CLORE ET AL. J.MAGN.RESON. 131, 159-162 (1998); J.MAGN.RESON.133, 216-221(1998)), A RADIUS OF GYRATION TERM (KUSZEWSKI ET AL.(1999), A QUARTIC VAN DER WAALS REPULSION TERM (NILGES ET AL. (1988) FEBS LETT. 229, 129- 136), AND A TORSION ANGLE CONFORMATIONAL DATABASE POTENTIAL OF MEAN FORCE (CLORE AND KUSZEWSKI 2002) J.AM.CHEM.SOC 124, 2866-2867). THE STARTING COORDINATE COME FROM THE X-RAY STRUCTURES (WITH PROTONS ADDED) OF E. COLI HPR (1POH, JIA ET AL. (1993) J.BIOL.CHEM. 268, 22940-22501, RESOLUTION 2.0 A); AND IIAMAN (1PDO, NUNN ET AL. (1996) J.MOL.BI J.MOL.BIOL. 259, 502-511; RESOLUTION 1.7A). THE BACKBONE COORDINATES AND NON-INTERFACIAL SIDECHAINS ARE TREATED AS RIGID BODIES THROUGHOUT WITH THE IIAMAN DIMER HELD FIXED, THE TWO HPR MOLECULES ALLOWED TO ROTATE AND TRANSLATE, AND THE AXIS OF THE SINGLE DIPOLAR COUPLING ALIGNMENT TENSOR FREE TO ROTATE. THE INTERFACIAL SIDECHAINS ARE GIVEN FULL TORSIONAL DEGREES OF FREEDOM. |
1 |
