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THE 3D STRUCTURE OF THE PH 4.75 FORM OF THE ASCARIS TRYPSIN
INHIBITOR IN SOLUTION BY NMR IS BASED ON 1078 EXPERIMENTAL
RESTRAINTS COMPRISING: 43 SHORT RANGE (1 < |I-J| <=5) AND
218 LONG RANGE (|I-J|>5) INTERRESIDUE INTERPROTON
DISTANCE RESTRAINTS, 320 INTRARESIDUE INTERPROTON DISTANCE
RESTRAINTS, 48 DISTANCE RESTRAINTS FOR 4 HYDROGEN BONDS,
AND 59 PHI, 49 PSI AND 41 CHI1 TORSION ANGLE RESTRAINTS. A
COMPLETE LIST OF EXPERIMENTAL RESTRAINTS HAS BEEN
DEPOSITED WITH THE BROOKHAVEN DATA BANK.
THE STRUCTURES ARE CALCULATED USING THE HYBRID METRIC
MATRIX DISTANCE GEOMETRY-DYNAMICAL SIMULATED ANNEALING
METHOD DESCRIBED BY: NILGES, M., CLORE, G.M. &
GRONENBORN, A.M. (1988) FEBS LETT 29, 317-324 ALL
STRUCTURAL STATISTICS ARE GIVEN IN REFERENCE 1.
THIS ENTRY PRESENTS THE RESTRAINED MINIMIZED AVERAGE
STRUCTURE (SA)R. THIS IS OBTAINED BY FIRST AVERAGING THE
COORDINATES OF THE INDIVIDUAL 32 DYNAMICAL SIMULATED
ANNEALING SA STRUCTURES BEST FITTED TO RESIDUES 5 - 60, AND
SUBJECTING THE RESULTING COORDINATES TO RESTRAINED
MINIMIZATION. COLUMNS 61 - 66 IN THIS SET OF COORDINATES
(THE B VALUE FIELD IN X-RAY STRUCTURES) GIVES THE AVERAGE
RMS DIFFERENCE BETWEEN THE INDIVIDUAL SA STRUCTURES AND THE
MEAN STRUCTURE. THE QUANTITIES IN THIS FIELD OF THE
INDIVIDUAL STRUCTURES HAVE NO MEANING. THE INDIVIDUAL
STRUCTURES ARE PRESENTED IN PROTEIN DATA BANK ENTRY 1ATD. |
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