1ATB

HIGH-RESOLUTION STRUCTURE OF ASCARIS TRYPSIN INHIBITOR IN SOLUTION: DIRECT EVIDENCE FOR A PH INDUCED CONFORMATIONAL TRANSITION IN THE REACTIVE SITE


SOLUTION NMR Experimental Data


NMR Refinement
Details THE 3D STRUCTURE OF THE PH 2.4 FORM OF THE ASCARIS TRYPSIN INHIBITOR IN SOLUTION BY NMR IS BASED ON 1083 EXPERIMENTAL RESTRAINTS COMPRISING: 49 SHORT RANGE (1 < |I-J| <=5) AND 216 LONG RANGE (|I-J|>5) INTERRESIDUE INTERPROTON DISTANCE RESTRAINTS, 323 INTRARESIDUE INTERPROTON DISTANCE RESTRAINTS, 46 DISTANCE RESTRAINTS FOR 3 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 1ATE.
NMR Ensemble Information
Conformers Submitted Total Number 1