Please note that you are looking at an abridged version of the output (all checks that gave normal results have been removed from this report). You can have a look at the Full report instead.
259 WZC (1263-) A - 263 WZC (1264-) A -
In a colour picture, the residues that are part of a helix are shown in blue, strand residues in red. Preferred regions for helical residues are drawn in blue, for strand residues in red, and for all other residues in green. A full explanation of the Ramachandran plot together with a series of examples can be found at the WHAT_CHECK website.
Chain identifier: A
Coordinate problems, unexpected atoms, B-factor and occupancy checks
Warning: Missing atoms
The atoms listed in the table below are missing from the entry. If many atoms
are missing, the other checks can become less sensitive. Be aware that it
often happens that groups at the termini of DNA or RNA are really missing,
so that the absence of these atoms normally is neither an error nor the
result of poor electron density. Some of the atoms listed here might also be
listed by other checks, most noticeably by the options in the previous
section that list missing atoms in several categories. The plausible atoms
with zero occupancy are not listed here, as they already got assigned a
non-zero occupancy, and thus are no longer 'missing'.
71 ASP ( 75-) A CG 71 ASP ( 75-) A OD1 71 ASP ( 75-) A OD2
Obviously, the temperature at which the X-ray data was collected has some importance too:
Crystal temperature (K) :100.000
Note: B-factor plot
The average atomic B-factor per residue is plotted as function of the residue
Chain identifier: A
Nomenclature related problems
Warning: Aspartic acid convention problem
The aspartic acid residues listed in the table below have their chi-2 not
between -90.0 and 90.0, or their proton on OD1 instead of OD2.
125 ASP ( 129-) A
102 GLU ( 106-) A 182 GLU ( 186-) A
Atom names starting with "-" belong to the previous residue in the chain. If the second atom name is "-SG*", the disulphide bridge has a deviating length.
122 LYS ( 126-) A N -C 2.15 41.0
RMS Z-score for bond lengths: 0.415
RMS-deviation in bond distances: 0.009
Warning: Possible cell scaling problem
Comparison of bond distances with Engh and Huber [REF] standard values for
protein residues and Parkinson et al [REF] values for DNA/RNA shows a
significant systematic deviation. It could be that the unit cell used in
refinement was not accurate enough. The deformation matrix given below gives
the deviations found: the three numbers on the diagonal represent the
relative corrections needed along the A, B and C cell axis. These values are
1.000 in a normal case, but have significant deviations here (significant at
the 99.99 percent confidence level)
There are a number of different possible causes for the discrepancy. First the cell used in refinement can be different from the best cell calculated. Second, the value of the wavelength used for a synchrotron data set can be miscalibrated. Finally, the discrepancy can be caused by a dataset that has not been corrected for significant anisotropic thermal motion.
Please note that the proposed scale matrix has NOT been restrained to obey the space group symmetry. This is done on purpose. The distortions can give you an indication of the accuracy of the determination.
If you intend to use the result of this check to change the cell dimension of your crystal, please read the extensive literature on this topic first. This check depends on the wavelength, the cell dimensions, and on the standard bond lengths and bond angles used by your refinement software.
Unit Cell deformation matrix
| 0.997915 0.000995 0.000390| | 0.000995 0.997855 -0.000399| | 0.000390 -0.000399 0.997959|Proposed new scale matrix
| 0.023835 -0.000024 -0.000009| | -0.000014 0.013935 0.000006| | -0.000005 0.000005 0.013587|With corresponding cell
A = 41.956 B = 71.762 C = 73.601 Alpha= 90.046 Beta= 89.955 Gamma= 89.886
The CRYST1 cell dimensions
A = 42.044 B = 71.916 C = 73.751 Alpha= 90.000 Beta= 90.000 Gamma= 90.000
(Under-)estimated Z-score: 4.768
Warning: Unusual bond angles
The bond angles listed in the table below were found to deviate more than 4
sigma from standard bond angles (both standard values and sigma for protein
residues have been taken from Engh and Huber [REF], for DNA/RNA from
Parkinson et al [REF]). In the table below for each strange angle the bond
angle and the number of standard deviations it differs from the standard
values is given. Please note that disulphide bridges are neglected. Atoms
starting with "-" belong to the previous residue in the sequence.
122 LYS ( 126-) A -C N CA 108.89 -7.1
102 GLU ( 106-) A 125 ASP ( 129-) A 182 GLU ( 186-) A
These scores give an impression of how `normal' the torsion angles in protein residues are. All torsion angles except omega are used for calculating a `normality' score. Average values and standard deviations were obtained from the residues in the WHAT IF database. These are used to calculate Z-scores. A residue with a Z-score of below -2.0 is poor, and a score of less than -3.0 is worrying. For such residues more than one torsion angle is in a highly unlikely position.
79 PRO ( 83-) A -2.9 96 LEU ( 100-) A -2.6 171 PHE ( 175-) A -2.4 162 ILE ( 166-) A -2.2 188 THR ( 192-) A -2.1 107 LYS ( 111-) A -2.1 88 GLN ( 92-) A -2.1 57 LEU ( 60-) A -2.1 248 ASN ( 252-) A -2.0
Residues with `forbidden' phi-psi combinations are listed, as well as residues with unusual omega angles (deviating by more than 3 sigma from the normal value). Please note that it is normal if about 5 percent of the residues is listed here as having unusual phi-psi combinations.
26 SER ( 29-) A PRO omega poor 34 THR ( 37-) A Poor phi/psi 82 GLY ( 86-) A Poor phi/psi 107 LYS ( 111-) A Poor phi/psi 173 ASN ( 177-) A Poor phi/psi 186 TYR ( 190-) A omega poor 192 SER ( 196-) A omega poor 196 PRO ( 200-) A PRO omega poor 198 LEU ( 202-) A Poor phi/psi 248 ASN ( 252-) A Poor phi/psi chi-1/chi-2 correlation Z-score : -1.941
For this check, backbone conformations are compared with database structures using C-alpha superpositions with some restraints on the backbone oxygen positions.
A residue mentioned in the table can be part of a strange loop, or there might be something wrong with it or its directly surrounding residues. There are a few of these in every protein, but in any case it is worth looking at!
4 TYR ( 7-) A 0 7 HIS ( 10-) A 0 17 PHE ( 20-) A 0 21 LYS ( 24-) A 0 24 ARG ( 27-) A 0 26 SER ( 29-) A 0 34 THR ( 37-) A 0 47 SER ( 50-) A 0 55 ARG ( 58-) A 0 59 ASN ( 62-) A 0 61 HIS ( 64-) A 0 63 PHE ( 66-) A 0 69 ASP ( 72-) A 0 70 SER ( 73-) A 0 71 ASP ( 75-) A 0 72 LYS ( 76-) A 0 73 ALA ( 77-) A 0 76 LYS ( 80-) A 0 79 PRO ( 83-) A 0 81 ASP ( 85-) A 0 88 GLN ( 92-) A 0 92 HIS ( 96-) A 0 95 SER ( 99-) A 0 99 GLN ( 103-) A 0 103 HIS ( 107-) A 0And so on for a total of 113 lines.
10 PRO ( 13-) A 114.5 envelop C-beta (108 degrees) 245 PRO ( 249-) A 42.4 envelop C-delta (36 degrees)
The contact distances of all atom pairs have been checked. Two atoms are said to `bump' if they are closer than the sum of their Van der Waals radii minus 0.40 Angstrom. For hydrogen bonded pairs a tolerance of 0.55 Angstrom is used. The first number in the table tells you how much shorter that specific contact is than the acceptable limit. The second distance is the distance between the centres of the two atoms. Although we believe that two water atoms at 2.4 A distance are too close, we only report water pairs that are closer than this rather short distance.
The last text-item on each line represents the status of the atom pair. If the final column contains the text 'HB', the bump criterion was relaxed because there could be a hydrogen bond. Similarly relaxed criteria are used for 1-3 and 1-4 interactions (listed as 'B2' and 'B3', respectively). BL indicates that the B-factors of the clashing atoms have a low B-factor thereby making this clash even more worrisome. INTRA and INTER indicate whether the clashes are between atoms in the same asymmetric unit, or atoms in symmetry related asymmetric units, respectively.
69 ASP ( 72-) A O <-> 85 ARG ( 89-) A NH1 0.26 2.44 INTRA 64 ASN ( 67-) A A ND2 <-> 88 GLN ( 92-) A NE2 0.18 2.67 INTRA BL 59 ASN ( 62-) A ND2 <-> 64 ASN ( 67-) A A OD1 0.16 2.54 INTRA 227 ASN ( 231-) A OD1 <-> 234 GLU ( 238-) A N 0.13 2.57 INTRA 175 ASP ( 179-) A OD2 <-> 177 ARG ( 181-) A NH2 0.12 2.58 INTRA 165 LYS ( 169-) A NZ <-> 264 HOH (2100 ) A O 0.11 2.59 INTRA 219 LEU ( 223-) A CD1 <-> 264 HOH (2063 ) A O 0.10 2.70 INTRA 103 HIS ( 107-) A NE2 <-> 189 TYR ( 193-) A OH 0.08 2.62 INTRA BL 146 GLY ( 150-) A N <-> 213 VAL ( 217-) A O 0.08 2.62 INTRA BL 58 ASN ( 61-) A O <-> 166 GLY ( 170-) A N 0.08 2.62 INTRA 185 ASP ( 189-) A OD2 <-> 208 LYS ( 212-) A NZ 0.07 2.63 INTRA 30 ILE ( 33-) A N <-> 104 THR ( 108-) A O 0.06 2.64 INTRA BL 52 THR ( 55-) A N <-> 264 HOH (2054 ) A O 0.06 2.64 INTRA 26 SER ( 29-) A N <-> 192 SER ( 196-) A OG 0.05 2.65 INTRA BL 7 HIS ( 10-) A C <-> 12 HIS ( 15-) A CD2 0.05 3.15 INTRA 127 GLY ( 131-) A O <-> 131 GLN ( 135-) A NE2 0.05 2.65 INTRA 91 PHE ( 95-) A N <-> 264 HOH (2049 ) A O 0.04 2.66 INTRA BL 131 GLN ( 135-) A OE1 <-> 264 HOH (2088 ) A O 0.04 2.36 INTRA 44 LEU ( 47-) A N <-> 264 HOH (2044 ) A O 0.04 2.66 INTRA 121 THR ( 125-) A O <-> 124 GLY ( 128-) A N 0.03 2.67 INTRA 69 ASP ( 72-) A OD2 <-> 119 TRP ( 123-) A NE1 0.03 2.67 INTRA 81 ASP ( 85-) A N <-> 264 HOH (2057 ) A O 0.03 2.67 INTRA 167 LYS ( 171-) A NZ <-> 229 GLU ( 233-) A OE1 0.03 2.67 INTRA 55 ARG ( 58-) A NH1 <-> 264 HOH (2047 ) A O 0.02 2.68 INTRA 29 ASP ( 32-) A N <-> 264 HOH (2130 ) A O 0.02 2.68 INTRA BL 250 GLN ( 254-) A OE1 <-> 264 HOH (2133 ) A O 0.02 2.38 INTRA 29 ASP ( 32-) A OD1 <-> 107 LYS ( 111-) A N 0.01 2.69 INTRA BL 224 LEU ( 228-) A O <-> 236 MET ( 240-) A N 0.01 2.69 INTRA BL 70 SER ( 73-) A OG <-> 264 HOH (2056 ) A O 0.01 2.39 INTRA 219 LEU ( 223-) A CD1 <-> 222 ARG ( 226-) A NH1 0.01 3.09 INTRA 195 THR ( 199-) A O <-> 198 LEU ( 202-) A N 0.01 2.69 INTRA BL
Chain identifier: A
Warning: Abnormal packing environment for some residues
The residues listed in the table below have an unusual packing environment.
The packing environment of the residues is compared with the average packing environment for all residues of the same type in good PDB files. A low packing score can indicate one of several things: Poor packing, misthreading of the sequence through the density, crystal contacts, contacts with a co-factor, or the residue is part of the active site. It is not uncommon to see a few of these, but in any case this requires further inspection of the residue.
7 HIS ( 10-) A -6.38 33 HIS ( 36-) A -5.24 96 LEU ( 100-) A -5.13 131 GLN ( 135-) A -5.09
Chain identifier: A
Warning: Low packing Z-score for some residues
The residues listed in the table below have an unusual packing
environment according to the 2nd generation packing check. The score
listed in the table is a packing normality Z-score: positive means
better than average, negative means worse than average. Only residues
scoring less than -2.50 are listed here. These are the unusual
residues in the structure, so it will be interesting to take a
special look at them.
247 LYS ( 251-) A -2.74
Chain identifier: A
Water, ion, and hydrogenbond related checks
Warning: Water molecules need moving
The water molecules listed in the table below were found to be significantly
closer to a symmetry related non-water molecule than to the ones given in the
coordinate file. For optimal viewing convenience revised coordinates for
these water molecules should be given.
The number in brackets is the identifier of the water molecule in the input file. Suggested coordinates are also given in the table. Please note that alternative conformations for protein residues are not taken into account for this calculation. If you are using WHAT IF / WHAT-CHECK interactively, then the moved waters can be found in PDB format in the file: MOVEDH2O.pdb.
264 HOH (2011 ) A O -2.53 15.41 3.71
64 ASN ( 67-) A
Hydrogen bond donors that are buried inside the protein normally use all of their hydrogens to form hydrogen bonds within the protein. If there are any non hydrogen bonded buried hydrogen bond donors in the structure they will be listed here. In very good structures the number of listed atoms will tend to zero.
Waters are not listed by this option.
28 VAL ( 31-) A N 50 GLN ( 53-) A N 72 LYS ( 76-) A NZ 85 ARG ( 89-) A NE 88 GLN ( 92-) A NE2 96 LEU ( 100-) A N 109 LYS ( 113-) A A NZ 127 GLY ( 131-) A N 199 LEU ( 203-) A N 228 GLY ( 232-) A N 239 ASN ( 243-) A ND2 240 TRP ( 244-) A N 255 PHE ( 259-) A N 256 LYS ( 260-) A N Only metal coordination for 61 HIS ( 64-) A NE2 Only metal coordination for 90 HIS ( 94-) A NE2 Only metal coordination for 92 HIS ( 96-) A NE2 Only metal coordination for 115 HIS ( 119-) A ND1
The output gives the ion, the valency score for the ion itself, the valency score for the suggested alternative ion, and a series of possible comments *1 indicates that the suggested alternate atom type has been observed in the PDB file at another location in space. *2 indicates that WHAT IF thinks to have found this ion type in the crystallisation conditions as described in the REMARK 280 cards of the PDB file. *S Indicates that this ions is located at a special position (i.e. at a symmetry axis). N4 stands for NH4+.
260 ZN (1265-) A -.- -.- Too few ligands (1) 261 ZN (1266-) A -.- -.- Too few ligands (0)
157 ASP ( 161-) A H-bonding suggests Asn; but Alt-Rotamer
The second part of the table mostly gives an impression of how well the model conforms to common refinement restraint values. The first part of the table shows a number of global quality indicators.
Structure Z-scores, positive is better than average:
1st generation packing quality : 0.034 2nd generation packing quality : 0.265 Ramachandran plot appearance : -1.557 chi-1/chi-2 rotamer normality : -1.941 Backbone conformation : -0.761
Bond lengths : 0.415 (tight) Bond angles : 0.667 Omega angle restraints : 1.075 Side chain planarity : 0.540 (tight) Improper dihedral distribution : 0.652 B-factor distribution : 0.452 Inside/Outside distribution : 0.939
The second part of the table mostly gives an impression of how well the model conforms to common refinement restraint values. The first part of the table shows a number of global quality indicators, which have been calibrated against structures of similar resolution.
Resolution found in PDB file : 1.64
Structure Z-scores, positive is better than average:
1st generation packing quality : 0.3 2nd generation packing quality : -0.6 Ramachandran plot appearance : -2.0 chi-1/chi-2 rotamer normality : -2.4 Backbone conformation : -1.1
Bond lengths : 0.415 (tight) Bond angles : 0.667 Omega angle restraints : 1.075 Side chain planarity : 0.540 (tight) Improper dihedral distribution : 0.652 B-factor distribution : 0.452 Inside/Outside distribution : 0.939 ==============
WHAT IF G.Vriend, WHAT IF: a molecular modelling and drug design program, J. Mol. Graph. 8, 52--56 (1990). WHAT_CHECK (verification routines from WHAT IF) R.W.W.Hooft, G.Vriend, C.Sander and E.E.Abola, Errors in protein structures Nature 381, 272 (1996). (see also http://swift.cmbi.ru.nl/gv/whatcheck for a course and extra inform Bond lengths and angles, protein residues R.Engh and R.Huber, Accurate bond and angle parameters for X-ray protein structure refinement, Acta Crystallogr. A47, 392--400 (1991). Bond lengths and angles, DNA/RNA G.Parkinson, J.Voitechovsky, L.Clowney, A.T.Bruenger and H.Berman, New parameters for the refinement of nucleic acid-containing structures Acta Crystallogr. D52, 57--64 (1996). DSSP W.Kabsch and C.Sander, Dictionary of protein secondary structure: pattern recognition of hydrogen bond and geometrical features Biopolymers 22, 2577--2637 (1983). Hydrogen bond networks R.W.W.Hooft, C.Sander and G.Vriend, Positioning hydrogen atoms by optimizing hydrogen bond networks in protein structures PROTEINS, 26, 363--376 (1996). Matthews' Coefficient B.W.Matthews Solvent content of Protein Crystals J. Mol. Biol. 33, 491--497 (1968). Protein side chain planarity R.W.W. Hooft, C. Sander and G. Vriend, Verification of protein structures: side-chain planarity J. Appl. Cryst. 29, 714--716 (1996). Puckering parameters D.Cremer and J.A.Pople, A general definition of ring puckering coordinates J. Am. Chem. Soc. 97, 1354--1358 (1975). Quality Control G.Vriend and C.Sander, Quality control of protein models: directional atomic contact analysis, J. Appl. Cryst. 26, 47--60 (1993). Ramachandran plot G.N.Ramachandran, C.Ramakrishnan and V.Sasisekharan, Stereochemistry of Polypeptide Chain Conformations J. Mol. Biol. 7, 95--99 (1963). Symmetry Checks R.W.W.Hooft, C.Sander and G.Vriend, Reconstruction of symmetry related molecules from protein data bank (PDB) files J. Appl. Cryst. 27, 1006--1009 (1994). Ion Checks I.D.Brown and K.K.Wu, Empirical Parameters for Calculating Cation-Oxygen Bond Valences Acta Cryst. B32, 1957--1959 (1975). M.Nayal and E.Di Cera, Valence Screening of Water in Protein Crystals Reveals Potential Na+ Binding Sites J.Mol.Biol. 256 228--234 (1996). P.Mueller, S.Koepke and G.M.Sheldrick, Is the bond-valence method able to identify metal atoms in protein structures? Acta Cryst. D 59 32--37 (2003). Checking checks K.Wilson, C.Sander, R.W.W.Hooft, G.Vriend, et al. Who checks the checkers J.Mol.Biol. (1998) 276,417-436.