July 19, 2021 Dataset Open Access

Williams, Christopher; Richardson, David; Richardson, Jane

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    <subfield code="a">&lt;p&gt;Introduction&lt;br&gt;
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This directory contains files from the top2018 dataset by the Richardson Lab at Duke University.&lt;/p&gt;

&lt;p&gt;These are high-quality residues from high-quality, low redundancy protein chains in the PDB.&lt;/p&gt;

&lt;p&gt;&lt;br&gt;
Usage recommendations&lt;br&gt;
--------------------------------------------------------------------------------&lt;br&gt;
Protein residues that fail the filtering criteria described below have been removed from the files.&amp;nbsp; As a result, these files can be considered pre-filtered and will return only results for residues of good model quality with supporting experimental data.&amp;nbsp; As long as the question concerns mainchain protein atoms, these files should be usable as is.&amp;nbsp; There is a separate version that has been filtered on all atoms that is suitable for sidechains.&lt;/p&gt;

&lt;p&gt;The top2018 contains several different levels of homology clustering to ensure nonredundant datasets.&amp;nbsp; The 70% homology level is a reliable default.&amp;nbsp; These chains are listed in top2018_chains_hom70_mcfilter_60pct_complete.txt and found in top2018_pdbs_mc_filteredhom70.tar.gz&lt;/p&gt;

&lt;p&gt;Files are organized in subdirectories based on the first two letters of their PDB ids.&amp;nbsp; The included python script sample_file_loop.py may aid in accessing the directory structure.&lt;/p&gt;

&lt;p&gt;Files already contain hydrogens added by Reduce.&amp;nbsp; NQH flips have been performed to ensure that these are the best versions of these structures.&lt;/p&gt;

&lt;p&gt;top2018_metadata_mc_filtered.csv contains information on release data, resolution, and validation scores.&lt;/p&gt;

&lt;p&gt;top2018_passrates_mc_filtered.csv contains information on how many protein residues from the original chain passed the quality filters.&lt;/p&gt;

&lt;p&gt;&lt;br&gt;
Homology sets:&lt;br&gt;
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Using sequence homology clusters provided by the RCSB PDB, for each homology cluster, the best chain was selected for inclusion in the dataset.&amp;nbsp; This ensures minimal sequence/structural redundancy.&lt;/p&gt;

&lt;p&gt;The top2018 is available at several different levels of homology clustering, which may be appropriate to different uses.&amp;nbsp; Lists of the included chains at each homology level are included in this distribution.&lt;/p&gt;

&lt;p&gt;Lower homology numbers mean greater variety and less redundancy, but also fewer total chains in the dataset.&lt;/p&gt;

&lt;p&gt;For general use, ***we recommend the 70% homology set*** as a good balance between inclusivity and variety. This list is given in the file top2018_chains_hom70_mcfilter_60pct_complete.txt&lt;/p&gt;

&lt;p&gt;&lt;br&gt;
Usage caveats:&lt;br&gt;
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These files are incomplete.&amp;nbsp; They are single chains from structures that may have had multiple chains.&amp;nbsp; Residues that fail the filtering criteria have been removed.&amp;nbsp; Programs with strong requirements for completeness or uninterrupted chains should be used with care.&amp;nbsp; Chain completeness and fragmentation statistics are available in top2018_passrates_mc_filted.csv and in USER records at the end on each .pdb file.&lt;/p&gt;

&lt;p&gt;All header information from the original structure has been preserved.&amp;nbsp; This includes information about chains and residues no longer present in the file.&lt;/p&gt;

&lt;p&gt;All ligands and waters associated with the chain have been preserved without filtering.&amp;nbsp; Robust ligand filtering is beyond the scope of this dataset.&amp;nbsp; Trust the ligands at your own discretion.&lt;/p&gt;

&lt;p&gt;Sidechain atoms beyond CB have not been considered in the filtering.&amp;nbsp; However, all sidechains have been included for residues that passed the mainchain filters.&amp;nbsp; DO NOT use this set of files for serious questions involving sidechains.&amp;nbsp; See our all-atom filtered dataset instead.&lt;/p&gt;

&lt;p&gt;&lt;br&gt;
Filtering criteria: Chain level&lt;br&gt;
--------------------------------------------------------------------------------&lt;br&gt;
Chain is protein&lt;br&gt;
Released on or before Dec 31, 2018&lt;br&gt;
Resolution &amp;lt; 2.0&lt;br&gt;
MolProbity Score &amp;lt; 2.0&lt;br&gt;
&amp;lt;3% residues have cbeta deviations&lt;br&gt;
&amp;lt;2% residues have covalent bond length outliers&lt;br&gt;
&amp;lt;2% residues have covalent bond geometry outliers&lt;/p&gt;

&lt;p&gt;Using sequence homology clusters provided by the RCSB PDB, for each homology cluster, the chain with the best (lowest) average of Resolution and MolProbity Score was selected.&lt;/p&gt;

&lt;p&gt;&lt;br&gt;
Filtering criteria: Residue level&lt;br&gt;
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Even good structures may contain poorly-resolved regions.&amp;nbsp; Residue-level filtering helps avoid including these regions in otherwise high-quality data&lt;/p&gt;

&lt;p&gt;Mainchain atoms are defined as N, CA, C, O, CB.&lt;br&gt;
Note that CB is included, since its ideal position is defined by the other mainchan atoms.&lt;/p&gt;

&lt;p&gt;All mainchain atoms in a residue:&lt;br&gt;
Bfactor &amp;lt;= 40&lt;br&gt;
Real-space correlation coefficient (rscc) &amp;gt;= 0.7&lt;br&gt;
2Fo-Fc map value &amp;gt;= 1.2&lt;/p&gt;

&lt;p&gt;Additionally, residues are not allowed to have:&lt;br&gt;
Covalent geometry outliers&lt;br&gt;
Steric overlaps or &amp;quot;clashes&amp;quot;, as per Probe&lt;br&gt;
Alternate conformations&lt;/p&gt;

&lt;p&gt;&lt;br&gt;
Chain Completeness criteria&lt;br&gt;
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Chains which lost &amp;gt;40% of their residues during filtering were dropped from this dataset.&amp;nbsp; All chains present here are at least 60% complete.&lt;/p&gt;

&lt;p&gt;Filtering doumentation&lt;br&gt;
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Each file documents its pruned and incluced residues with USER records.&amp;nbsp; These include self-documenting USER&amp;nbsp; DOC lines as follow:&lt;br&gt;
USER&amp;nbsp; DOC Lines marked with USER&amp;nbsp; DEL list residues pruned by&lt;br&gt;
USER&amp;nbsp; DOC quality filtering.&lt;br&gt;
USER&amp;nbsp; DOC Format is chain:resseq:icode:reason_for_pruning&lt;br&gt;
USER&amp;nbsp; DOC Reasons for pruning are abbreviated as 1-letter codes: bcmgoa&lt;br&gt;
USER&amp;nbsp; DOC b=bfactor, c=real space correlation, m=2Fo-Fc mapvalue&lt;br&gt;
USER&amp;nbsp; DOC g=geometry outlier, o=steric overlap, a=alternate conformations&lt;br&gt;
USER&amp;nbsp; DOC Lines marked USER&amp;nbsp; INC list the uninterrupted fragments of structure&lt;br&gt;
USER&amp;nbsp; DOC still included after pruning by quality filtering&lt;br&gt;
USER&amp;nbsp; DOC Format is chain1:resseq1:icode1:chain2:resseq2:icode2:fragment_length&lt;br&gt;
USER&amp;nbsp; DOC where 1 is the first and 2 the last residue of the fragment&lt;br&gt;
USER&amp;nbsp; DOC Line marked with USER&amp;nbsp; PCT gives statistics for structure completeness&lt;/p&gt;</subfield>
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