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.
357 GOL ( 501-) 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: What type of B-factor?
WHAT IF does not yet know well how to cope with B-factors in case TLS has
been used. It simply assumes that the B-factor listed on the ATOM and HETATM
cards are the total B-factors. When TLS refinement is used that assumption
sometimes is not correct. The header of the PDB file states that TLS groups
were used. So, if WHAT IF complains about your B-factors, while you think
that they are OK, then check for TLS related B-factor problems first.
Obviously, the temperature at which the X-ray data was collected has some importance too:
Number of TLS groups mentione in PDB file header: 0
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: Arginine nomenclature problem
The arginine residues listed in the table below have their N-H-1 and N-H-2
40 ARG ( 87-) A 56 ARG ( 103-) A 62 ARG ( 109-) A 105 ARG ( 152-) A 166 ARG ( 213-) A 202 ARG ( 249-) A 233 ARG ( 280-) A
37 TYR ( 84-) A 338 TYR ( 385-) A
82 PHE ( 129-) A 349 PHE ( 396-) A
32 ASP ( 79-) A 38 ASP ( 85-) A 59 ASP ( 106-) A 116 ASP ( 163-) A 149 ASP ( 196-) A 244 ASP ( 291-) A 260 ASP ( 307-) A
1 GLU ( 48-) A 6 GLU ( 53-) A 66 GLU ( 113-) A 109 GLU ( 156-) A 161 GLU ( 208-) A
RMS Z-score for bond lengths: 0.329
RMS-deviation in bond distances: 0.007
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
| 1.003384 0.000904 -0.000290| | 0.000904 1.001563 -0.000269| | -0.000290 -0.000269 1.001241|Proposed new scale matrix
| 0.021589 -0.000019 0.000006| | -0.000011 0.012531 0.000003| | 0.000003 0.000003 0.011921|With corresponding cell
A = 46.320 B = 79.800 C = 83.884 Alpha= 90.031 Beta= 90.033 Gamma= 89.897
The CRYST1 cell dimensions
A = 46.163 B = 79.677 C = 83.777 Alpha= 90.000 Beta= 90.000 Gamma= 90.000
(Under-)estimated Z-score: 5.615
Warning: Low bond angle variability
Bond angles were found to deviate less than normal from the standard bond
angles (normal values for protein residues were taken from Engh and Huber
[REF], for DNA/RNA from Parkinson et al [REF]). The RMS Z-score given below
is expected to be near 1.0 for a normally restrained data set. The fact that
it is lower than 0.667 in this structure might indicate that too-strong
restraints have been used in the refinement. This can only be a problem for
high resolution X-ray structures.
RMS Z-score for bond angles: 0.598
RMS-deviation in bond angles: 1.217
Error: Nomenclature error(s)
Checking for a hand-check. WHAT IF has over the course of this session
already corrected the handedness of atoms in several residues. These were
administrative corrections. These residues are listed here.
1 GLU ( 48-) A 6 GLU ( 53-) A 32 ASP ( 79-) A 38 ASP ( 85-) A 40 ARG ( 87-) A 56 ARG ( 103-) A 59 ASP ( 106-) A 62 ARG ( 109-) A 66 GLU ( 113-) A 105 ARG ( 152-) A 109 GLU ( 156-) A 116 ASP ( 163-) A 149 ASP ( 196-) A 161 GLU ( 208-) A 166 ARG ( 213-) A 202 ARG ( 249-) A 233 ARG ( 280-) A 244 ASP ( 291-) A 260 ASP ( 307-) 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.
261 PRO ( 308-) A -2.8 26 THR ( 73-) A -2.6 37 TYR ( 84-) A -2.4 340 PRO ( 387-) A -2.4 22 HIS ( 69-) A -2.3 327 THR ( 374-) A -2.2 155 ARG ( 202-) A -2.2 102 TYR ( 149-) A -2.1 160 GLY ( 207-) A -2.1 44 ILE ( 91-) 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.
15 GLU ( 62-) A Poor phi/psi, omega poor 22 HIS ( 69-) A Poor phi/psi 46 ALA ( 93-) A PRO omega poor 49 PRO ( 96-) A Poor phi/psi 77 ALA ( 124-) A PRO omega poor 84 HIS ( 131-) A Poor phi/psi 104 GLN ( 151-) A Poor phi/psi 140 ARG ( 187-) A omega poor 155 ARG ( 202-) A omega poor 178 TYR ( 225-) A omega poor 180 ILE ( 227-) A omega poor 197 HIS ( 244-) A Poor phi/psi 212 SER ( 259-) A Poor phi/psi 228 SER ( 275-) A omega poor 233 ARG ( 280-) A Poor phi/psi 262 THR ( 309-) A Poor phi/psi 297 GLN ( 344-) A Poor phi/psi 306 ASP ( 353-) A Poor phi/psi 322 SER ( 369-) A Poor phi/psi chi-1/chi-2 correlation Z-score : -0.503
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!
9 LEU ( 56-) A 0 12 ASN ( 59-) A 0 14 ARG ( 61-) A 0 15 GLU ( 62-) A 0 17 PHE ( 64-) A 0 18 PRO ( 65-) A 0 19 ASN ( 66-) A 0 22 HIS ( 69-) A 0 23 PRO ( 70-) A 0 42 THR ( 89-) A 0 44 ILE ( 91-) A 0 46 ALA ( 93-) A 0 47 PRO ( 94-) A 0 49 PRO ( 96-) A 0 50 ASN ( 97-) A 0 62 ARG ( 109-) A 0 63 THR ( 110-) A 0 66 GLU ( 113-) A 0 70 VAL ( 117-) A 0 76 THR ( 123-) A 0 77 ALA ( 124-) A 0 79 ILE ( 126-) A 0 83 SER ( 130-) A 0 84 HIS ( 131-) A 0 85 PRO ( 132-) A 0And so on for a total of 157 lines.
For each of the residues in the structure, a search was performed to find 5-residue stretches in the WHAT IF database with superposable C-alpha coordinates, and some restraining on the neighbouring backbone oxygens.
In the following table the RMS distance between the backbone oxygen positions of these matching structures in the database and the position of the backbone oxygen atom in the current residue is given. If this number is larger than 1.5 a significant number of structures in the database show an alternative position for the backbone oxygen. If the number is larger than 2.0 most matching backbone fragments in the database have the peptide plane flipped. A manual check needs to be performed to assess whether the experimental data can support that alternative as well. The number in the last column is the number of database hits (maximum 80) used in the calculation. It is "normal" that some glycine residues show up in this list, but they are still worth checking!
343 GLY ( 390-) A 1.62 13
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.
1 GLU ( 48-) A N <-> 2 PRO ( 49-) A CD 0.17 2.83 INTRA 264 ASP ( 311-) A OD2 <-> 358 HOH ( 645 ) A O 0.17 2.23 INTRA 90 ASP ( 137-) A OD2 <-> 197 HIS ( 244-) A ND1 0.08 2.62 INTRA BL 227 ASN ( 274-) A OD1 <-> 237 ARG ( 284-) A NE 0.05 2.65 INTRA BL 112 ARG ( 159-) A NE <-> 358 HOH ( 943 ) A O 0.05 2.65 INTRA 140 ARG ( 187-) A NH1 <-> 358 HOH ( 674 ) A O 0.05 2.65 INTRA 1 GLU ( 48-) A CG <-> 2 PRO ( 49-) A CD 0.04 3.16 INTRA 223 ARG ( 270-) A NH2 <-> 358 HOH ( 887 ) A O 0.04 2.66 INTRA 4 TYR ( 51-) A CE1 <-> 6 GLU ( 53-) A CG 0.04 3.16 INTRA 297 GLN ( 344-) A NE2 <-> 358 HOH ( 982 ) A O 0.03 2.67 INTRA 22 HIS ( 69-) A ND1 <-> 38 ASP ( 85-) A OD2 0.02 2.68 INTRA BL 22 HIS ( 69-) A N <-> 339 GLU ( 386-) A OE2 0.01 2.69 INTRA BL 193 TYR ( 240-) A OH <-> 247 HIS ( 294-) A ND1 0.01 2.69 INTRA BL 197 HIS ( 244-) A NE2 <-> 358 HOH ( 821 ) A O 0.01 2.69 INTRA 112 ARG ( 159-) A NH2 <-> 358 HOH (1060 ) A O 0.01 2.69 INTRA
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.
105 ARG ( 152-) A -7.20 112 ARG ( 159-) A -6.50 233 ARG ( 280-) A -6.31 166 ARG ( 213-) A -6.27 14 ARG ( 61-) A -5.94 62 ARG ( 109-) A -5.72 44 ILE ( 91-) A -5.34
The table below lists the first and last residue in each stretch found, as well as the average residue score of the series.
44 ILE ( 91-) A 46 - ALA 93- ( A) -4.60
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.
47 PRO ( 94-) A -2.60
The table below lists the first and last residue in each stretch found, as well as the average residue Z-score of the series.
166 ARG ( 213-) A - 169 PRO ( 216-) A -1.90
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.
358 HOH ( 980 ) A O 29.91 6.07 6.28 358 HOH (1023 ) A O 16.03 23.38 15.19 358 HOH (1030 ) A O 14.68 -9.40 -17.56 358 HOH (1061 ) A O 6.81 23.19 14.53 358 HOH (1065 ) A O 15.92 -17.00 4.94 358 HOH (1066 ) A O 30.31 -6.56 10.45 358 HOH (1073 ) A O 14.69 21.28 14.27 358 HOH (1091 ) A O 1.95 -24.70 5.75 358 HOH (1092 ) A O -14.61 -0.70 1.99 358 HOH (1098 ) A O 13.59 -18.06 5.71 358 HOH (1102 ) A O -0.98 -23.85 1.77 358 HOH (1113 ) A O 11.55 22.49 14.73 358 HOH (1117 ) A O 20.49 -11.52 18.94
317 GLN ( 364-) 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.
25 LEU ( 72-) A N 98 ASN ( 145-) A ND2 149 ASP ( 196-) A N 155 ARG ( 202-) A NH2 214 ASN ( 261-) A N 264 ASP ( 311-) A N 346 TYR ( 393-) A OH
Side-chain hydrogen bond acceptors buried inside the protein normally form hydrogen bonds within the protein. If there are any not hydrogen bonded in the optimized hydrogen bond network they will be listed here.
Waters are not listed by this option.
176 GLN ( 223-) A OE1 263 ASN ( 310-) A OD1
The score listed is the valency score. This number should be close to (preferably a bit above) 1.0 for the suggested ion to be a likely alternative for the water molecule. Ions listed in brackets are good alternate choices. *1 indicates that the suggested ion-type has been observed elsewhere in the PDB file too. *2 indicates that the suggested ion-type has been observed in the REMARK 280 cards of the PDB file. Ion-B and ION-B indicate that the B-factor of this water is high, or very high, respectively. H2O-B indicates that the B-factors of atoms that surround this water/ion are suspicious. See: swift.cmbi.ru.nl/teach/theory/ for a detailed explanation.
358 HOH ( 654 ) A O 0.94 K 4 358 HOH ( 664 ) A O 0.88 NA 4 *2 Ion-B 358 HOH ( 736 ) A O 0.88 K 6 Ion-B 358 HOH ( 741 ) A O 0.90 K 4 358 HOH ( 786 ) A O 0.86 K 5 Ion-B 358 HOH ( 787 ) A O 1.01 K 6 ION-B 358 HOH ( 832 ) A O 1.10 K 4 358 HOH ( 855 ) A O 0.96 K 4 358 HOH ( 863 ) A O 1.11 K 4 358 HOH ( 871 ) A O 0.91 K 4 358 HOH ( 891 ) A O 1.13 K 4 358 HOH ( 910 ) A O 0.87 K 5 358 HOH ( 923 ) A O 0.98 K 5 ION-B 358 HOH ( 930 ) A O 0.88 K 4 H2O-B 358 HOH ( 962 ) A O 1.08 K 5
59 ASP ( 106-) A H-bonding suggests Asn; but Alt-Rotamer 132 ASP ( 179-) A H-bonding suggests Asn; but Alt-Rotamer 161 GLU ( 208-) A H-bonding suggests Gln 196 ASP ( 243-) A H-bonding suggests Asn; but Alt-Rotamer 244 ASP ( 291-) A H-bonding suggests Asn; but Alt-Rotamer 305 ASP ( 352-) A H-bonding suggests Asn
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 : 0.502 2nd generation packing quality : -1.107 Ramachandran plot appearance : -0.576 chi-1/chi-2 rotamer normality : -0.503 Backbone conformation : 0.402
Bond lengths : 0.329 (tight) Bond angles : 0.598 (tight) Omega angle restraints : 1.077 Side chain planarity : 0.413 (tight) Improper dihedral distribution : 0.612 B-factor distribution : 0.508 Inside/Outside distribution : 0.994
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 : 1.40
Structure Z-scores, positive is better than average:
1st generation packing quality : 0.6 2nd generation packing quality : -1.3 Ramachandran plot appearance : -1.0 chi-1/chi-2 rotamer normality : -1.1 Backbone conformation : -0.0
Bond lengths : 0.329 (tight) Bond angles : 0.598 (tight) Omega angle restraints : 1.077 Side chain planarity : 0.413 (tight) Improper dihedral distribution : 0.612 B-factor distribution : 0.508 Inside/Outside distribution : 0.994 ==============
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.