Mass: 18.015 Da / Num. of mol.: 38 / Source method: isolated from a natural source / Formula: H2O
Has protein modification
Y
Nonpolymer details
METHYL-2(2-CARBOXY-4-AMINO-PHENYL)ACETATE (ISM): LINKS C1 OF ISM AND OG OF S201 AND C8 OF ISM AND ...METHYL-2(2-CARBOXY-4-AMINO-PHENYL)ACETATE (ISM): LINKS C1 OF ISM AND OG OF S201 AND C8 OF ISM AND NE2 OF H254 THE ISOCOUMARIN RING IS OPENED BY THE NUCLEOPHILIC ATTACK OF S201 ON C1-O1 BOND AND SUBSEQUENTLY A REACTION BETWEEN HISTIDINE AT THE ACTIVE SITE CREATES A SECOND COVALENT BOND. ISM IS IDENTICAL TO HETEROGEN ICU IN PDB 1JIM BUT LACKS AN ACETATE MOLECULE AT POSITION C8. DIFFERENCE MAP PEAK INDICATE A POSSIBILITY OF ALTERNATE CONFORMATION AT RESIDUES 250-252 BUT SINCE THE DENSITY IS WEAK ONLY ONE CONFORMATION BASED ON GEOMETRY AND MAP HAS BEEN MODELLED. THE OCCUPANCY OF THE LIGAND ISM IS SET TO 1, WHEN REFINED IT INDICATES AN OCCUPANCY OF 0.92-0.96.
-
Experimental details
-
Experiment
Experiment
Method: X-RAY DIFFRACTION / Number of used crystals: 1
-
Sample preparation
Crystal
Density Matthews: 3.5 Å3/Da / Density % sol: 63.47 % / Description: NONE
Crystal grow
Temperature: 298 K / Method: vapor diffusion, hanging drop / pH: 7 / Details: 2 M AMMONIUM CHLORIDE, 0.1 M BIS-TRIS PH 7.0, 298K
Resolution: 2.09→31.161 Å / SU ML: 0.24 / σ(F): 1.34 / Phase error: 23.42 / Stereochemistry target values: ML Details: COVALENT LINK OF ICM WITH OG OF SER 201 AND NE2 OF HIS 254
Rfactor
Num. reflection
% reflection
Rfree
0.2429
844
5.1 %
Rwork
0.1982
-
-
obs
0.2004
16657
96.71 %
Solvent computation
Shrinkage radii: 0.9 Å / VDW probe radii: 1.11 Å / Solvent model: FLAT BULK SOLVENT MODEL / Bsol: 80.419 Å2 / ksol: 0.4 e/Å3
Displacement parameters
Biso mean: 44.72 Å2
Baniso -1
Baniso -2
Baniso -3
1-
-6.6529 Å2
0 Å2
0 Å2
2-
-
-6.6529 Å2
0 Å2
3-
-
-
13.3058 Å2
Refinement step
Cycle: LAST / Resolution: 2.09→31.161 Å
Protein
Nucleic acid
Ligand
Solvent
Total
Num. atoms
1426
0
142
38
1606
Refine LS restraints
Refine-ID
Type
Dev ideal
Number
X-RAY DIFFRACTION
f_bond_d
0.007
1604
X-RAY DIFFRACTION
f_angle_d
1.119
2136
X-RAY DIFFRACTION
f_dihedral_angle_d
14.301
571
X-RAY DIFFRACTION
f_chiral_restr
0.059
221
X-RAY DIFFRACTION
f_plane_restr
0.004
242
LS refinement shell
Resolution (Å)
Rfactor Rfree
Num. reflection Rfree
Rfactor Rwork
Num. reflection Rwork
Refine-ID
% reflection obs (%)
2.09-2.2209
0.276
128
0.2487
2273
X-RAY DIFFRACTION
85
2.2209-2.3923
0.2675
154
0.2169
2608
X-RAY DIFFRACTION
97
2.3923-2.633
0.2355
137
0.1985
2707
X-RAY DIFFRACTION
100
2.633-3.0137
0.2621
150
0.1895
2715
X-RAY DIFFRACTION
100
3.0137-3.7959
0.219
146
0.1846
2738
X-RAY DIFFRACTION
100
3.7959-31.1646
0.2408
129
0.1987
2772
X-RAY DIFFRACTION
98
+
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