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CXCR-1 N-TERMINAL PEPTIDE BOUND TO INTERLEUKIN-8 (MINIMIZED MEAN)
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
ASSIGNMENT: SEE REFERENCE 1; RESTRAINTS: 3D 15N-EDITED-NOESY HSQC
0.15 M
5.50
1 atm
308.00
2
3D 13C-FILTERED
0.15 M
5.50
1 atm
308.00
3
13C-EDITED-NOESY HMQC
0.15 M
5.50
1 atm
308.00
4
2D 15N-FILTERED NOESY
0.15 M
5.50
1 atm
308.00
5
2D 13C-FILTERED NOESY (100MS)
0.15 M
5.50
1 atm
308.00
6
15N-FILTERED NOESY (ALL MIXING TIMES = 100 MS)
0.15 M
5.50
1 atm
308.00
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Bruker
AMX 500
500
NMR Refinement
Method
Details
Software
RESTRAINED MOLECULAR DYNAMICS
INITIAL COORDINATES FOR IL-8 WERE TAKEN FROM PDB ENTRY 1IL8; A LINEAR CHAIN FOR THE CXCR-1 FRAGMENT WAS BUILT IN INSIGHT (MSI). THE CXCR-1 FRAGMENT WAS POSITIONED RANDOMLY WITH RESPECT TO IL8 - OBTAIN 40 STARTING CONFORMATIONS. THE INITIAL STRUCTURES WERE THEN REFINED USING RMD WITH THE AMBER ALL ATOM FORCE FIELD AS IMPLIMENTED WITHIN DISCOVER. ALL OF IL8 MONOMER B AND PARTS OF IL8 MONOMER A (2-7, 22-38 AND 51-72) WERE KEPT FIXED DURING THE REFINEMENT SINCE CHEMICAL SHIFT CHANGES INDICATED THAT THESE PORTION OF THE MOLECULE WERE NOT PERTURBED BY PEPTIDE BINDING. THIS MODEL IS THE RESULT OF RESTRAINED ENERGY MINIMIZATION OF THE GEOMETRIC MEAN OF 20 STRUCTURES FROM THE ENSEMBLE (ENTRY 1ILP) SEE JRNL ENTRY FOR MORE DETAILS.
Discover
NMR Ensemble Information
Conformer Selection Criteria
LEAST RESTRAINT VIOLATION ENERGY
Conformers Calculated Total Number
40
Conformers Submitted Total Number
1
Additional NMR Experimental Information
Details
THE ASSIGNMENTS WERE MADE USING TRIPLE RESONANCE NMR EXPERIMENTS CONDUCTED ON 13C/15N LABELED IL-8 BOUND TO UNLABELED CXCR-1 PEPTIDE (SEE JRNL ENTRY FOR MORE DETAILS) NOE RESTRAINTS WERE OBTAINED FROM 15N EDITED EXPERIMENTS (INTRA IL8), 13C OR 15N FILTERED EXPERIMENTS (INTRA CXCR-1) OR 13C-FILTERED/ EDITED EXPERIMENTS (INTERMOLECULAR RESTRAINTS)