| simulated annealing |
THE 3D STRUCTURE OF THE EIN WAS SOLVED BY
MULTI-DIMENSIONAL HETERONUCLEAR NMR AND
IS BASED ON 4251 EXPERIMENTAL NMR RESTRAINTS:
(A) INTRAPROTEIN: 952 SEQUENTIAL (|I- J|=1), 809 MEDIUM
RANGE (1 < |I-J| <=5) AND 586 LONG RANGE (|I-J| >5)
INTERRESIDUES AND 471 INTRARESIDUE APPROXIMATE INTERPROTON
DISTANCE RESTRAINTS; 230 DISTANCES FOR 115 BACKBONE
HYDROGEN BONDS; 140 TORSION ANGLE RESTRAINTS; 163
THREE-BOND HN-HA COUPLING CONSTANT RESTRAINTS; AND 498
(258 CALPHA AND 241 CBETA) 13C SHIFT RESTRAINTS. (NUMBERS
OF RESIDUES 1 - 259).
THE STRUCTURES WERE CALCULATED USING THE SIMULATED
ANNEALING PROTOCOL OF NILGES ET AL. (1988) FEBS LETT. 229,
129-136 USING THE PROGRAM X-PLOR 3.1 (BRUNGER) MODIFIED
TO INCORPORATE COUPLING CONSTANT (GARRETT ET AL. (1984) J.
MAGN. RESON. SERIES B 104, 99-103) AND CARBON CHEMICAL
SHIFT (KUSZEWSKI ET AL. (1995) J. MAGN. RESON. SERIES B
106, 92-96) RESTRAINTS, AND A CONFORMATIONAL DATABASE
POTENTIAL (KUSZEWSKI ET AL.(1996) PROTEIN SCI. 5, 1067-1080
IN THE RESTRAINED REGULARIZED MEAN COORDINATES THE
TEMPERATURE FACTOR FIELD REPRESENTS THE AVERAGE RMS
DIFFERENCE BETWEEN THE INDIVIDUAL SIMULATED ANNEALING
STRUCTURES AND THE MEAN COORDINATE POSITIONS. THE LAST
COLUMN IN THE INDIVIDUAL SA STRUCTURES HAS NO MEANING.
BEST FITTING TO GENERATE THE AVERAGE STRUCTURE IS WITH
RESPECT TO RESIDUES 1 - 246 (RESIDUES 250 - 259 ARE
DISORDERED IN SOLUTION) NOTE THE OCCUPANCY FIELD HAS NO
MEANING. |
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