Show PDB file:   
         Plain Text   HTML   (compressed file size)
QuickSearch:   
by PDB,NDB,UniProt,PROSITE Code or Search Term(s)  
(-)NMR Structure - model 1
(-)NMR Structure - all models
collapse expand < >
Image NMR Structure - model 1
NMR Structure - model 1  (Jmol Viewer)
Image NMR Structure - all models
NMR Structure - all models  (Jmol Viewer)

(-) Description

Title :  SOLUTION STRUCTURE OF THE THIRD RNA RECOGNITION MOTIF (RRM) OF U2AF65 IN COMPLEX WITH AN N-TERMINAL SF1 PEPTIDE
 
Authors :  P. Selenko, G. Gregorovic, R. Sprangers, G. Stier, Z. Rhani, A. Kramer, M. Sattler
Date :  24 Feb 03  (Deposition) - 06 May 03  (Release) - 24 Feb 09  (Revision)
Method :  SOLUTION NMR
Resolution :  NOT APPLICABLE
Chains :  NMR Structure  :  A,B  (10x)
Keywords :  Non-Canonical Rna Recognition Motif, 4-Stranded Anti- Parallel Beta-Sheet, 2 Alpha Helices Additionally Extended By A Third Helix C, Rna Binding Protein (Keyword Search: [Gene Ontology, PubMed, Web (Google))
 
Reference :  P. Selenko, G. Gregorovic, R. Sprangers, G. Stier, Z. Rhani, A. Kramer, M. Sattler
Structural Basis For The Molecular Recognition Between Human Splicing Factors U2Af65 And Sf1/Mbbp
Mol. Cell V. 11 965 2003
PubMed-ID: 12718882  |  Reference-DOI: 10.1016/S1097-2765(03)00115-1
(for further references see the PDB file header)

(-) Compounds

Molecule 1 - SPLICING FACTOR U2AF 65 KDA SUBUNIT
    ChainsA
    EngineeredYES
    Expression SystemESCHERICHIA COLI BL21(DE3)
    Expression System PlasmidMODIFIED PET24D
    Expression System StrainBL21 DE3
    Expression System Taxid469008
    Expression System Vector TypePLASMID
    FragmentC-TERMINAL RRM DOMAIN
    Organism CommonHUMAN
    Organism ScientificHOMO SAPIENS
    Organism Taxid9606
    SynonymU2 AUXILIARY FACTOR 65 KDA SUBUNIT, U2 SNRNP AUXILIARY FACTOR LARGE SUBUNIT, HU2AF(65)
 
Molecule 2 - SPLICING FACTOR SF1
    ChainsB
    EngineeredYES
    FragmentN-TERMINAL PEPTIDE
    Other DetailsTHE PEPTIDE WAS CHEMICALLY SYNTHESIZED AND DERIVED FROM THE N-TERMINUS OF SF1. THE SEQUENCE OF THE PEPTIDE IS NATURALLY FOUND IN HOMO SAPIENS (HUMAN).
    SyntheticYES

 Structural Features

(-) Chains, Units

  
NMR Structure (10x)

Summary Information (see also Sequences/Alignments below)

(-) Ligands, Modified Residues, Ions  (0, 0)

(no "Ligand,Modified Residues,Ions" information available for 1O0P)

(-) Sites  (0, 0)

(no "Site" information available for 1O0P)

(-) SS Bonds  (0, 0)

(no "SS Bond" information available for 1O0P)

(-) Cis Peptide Bonds  (0, 0)

(no "Cis Peptide Bond" information available for 1O0P)

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (0, 0)

(no "SAP(SNP)/Variant" information available for 1O0P)

(-) PROSITE Motifs  (1, 1)

NMR Structure (1, 1)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1RRMPS50102 Eukaryotic RNA Recognition Motif (RRM) profile.U2AF2_HUMAN149-231
259-337
385-466
  1-
-
A:385-466

(-) Exons   (3, 3)

NMR Structure (3, 3)
 ENSEMBLUniProtKBPDB
No.Transcript IDExonExon IDGenome LocationLengthIDLocationLengthCountLocationLength
1.1ENST000003089241ENSE00001247615chr19:56165416-561665191104U2AF2_HUMAN1-17170--
1.2ENST000003089242ENSE00001172989chr19:56170576-56170711136U2AF2_HUMAN17-62460--
1.3ENST000003089243ENSE00000953888chr19:56171543-5617158745U2AF2_HUMAN62-77160--
1.4ENST000003089244ENSE00001172973chr19:56171882-56171985104U2AF2_HUMAN77-112360--
1.5ENST000003089245ENSE00001178740chr19:56172404-56172555152U2AF2_HUMAN112-162510--
1.6ENST000003089246ENSE00001172954chr19:56173868-56173984117U2AF2_HUMAN163-201390--
1.7ENST000003089247ENSE00001172945chr19:56174972-56175110139U2AF2_HUMAN202-248470--
1.8ENST000003089248ENSE00000876731chr19:56179873-5617995280U2AF2_HUMAN248-274270--
1.9ENST000003089249ENSE00001178763chr19:56180036-56180158123U2AF2_HUMAN275-315410--
1.10bENST0000030892410bENSE00001172923chr19:56180449-5618054799U2AF2_HUMAN316-348330--
1.11ENST0000030892411ENSE00001178717chr19:56180810-56181058249U2AF2_HUMAN349-431831A:372-43160
1.12ENST0000030892412ENSE00001320361chr19:56185300-56186081782U2AF2_HUMAN432-475441A:432-47544

2.1eENST000003773901eENSE00001875721chr11:64546202-64545834369SF01_HUMAN1-11110--
2.3aENST000003773903aENSE00001681285chr11:64544098-64543970129SF01_HUMAN11-54441B:13-2513
2.4aENST000003773904aENSE00001605002chr11:64540977-6454090276SF01_HUMAN54-79260--
2.6dENST000003773906dENSE00001732947chr11:64537880-64537728153SF01_HUMAN79-130520--
2.7ENST000003773907ENSE00001754448chr11:64537525-6453743690SF01_HUMAN130-160310--
2.8cENST000003773908cENSE00001781351chr11:64537081-64536898184SF01_HUMAN160-221620--
2.9bENST000003773909bENSE00001785757chr11:64536810-64536695116SF01_HUMAN222-260390--
2.10aENST0000037739010aENSE00001682227chr11:64536601-64536494108SF01_HUMAN260-296370--
2.11bENST0000037739011bENSE00001711248chr11:64535758-64535578181SF01_HUMAN296-356610--
2.12aENST0000037739012aENSE00000863666chr11:64535316-64535043274SF01_HUMAN357-448920--
2.13bENST0000037739013bENSE00001788125chr11:64534723-6453466460SF01_HUMAN448-468210--
2.14aENST0000037739014aENSE00001645230chr11:64534551-64534372180SF01_HUMAN468-528610--
2.15fENST0000037739015fENSE00001473768chr11:64533627-645320781550SF01_HUMAN528-6391120--

(-) Sequences/Alignments

NMR Structure
   Reformat: Number of residues per line =  ('0' or empty: single-line sequence representation)
  Number of residues per labelling interval =   
  UniProt sequence: complete  aligned part    
   Show mapping: SCOP domains CATH domains Pfam domains Secondary structure (by author)
SAPs(SNPs) PROSITE motifs Exons
(details for a mapped element are shown in a popup box when the mouse pointer rests over it)
Chain A from PDB  Type:PROTEIN  Length:104
 aligned with U2AF2_HUMAN | P26368 from UniProtKB/Swiss-Prot  Length:475

    Alignment length:104
                                   381       391       401       411       421       431       441       451       461       471    
          U2AF2_HUMAN   372 GHPTEVLCLMNMVLPEELLDDEEYEEIVEDVRDECSKYGLVKSIEIPRPVDGVEVPGCGKIFVEFTSVFDCQKAMQGLTGRKFANRVVVTKYCDPDSYHRRDFW 475
               SCOP domains d1o0pa_ A: Splicing factor U2AF 65 KDa subunit                                                           SCOP domains
               CATH domains 1o0pA00 A:372-475  [code=3.30.70.330, no name defined]                                                   CATH domains
               Pfam domains ---------------------------RRM_1-1o0pA01 A:399-460                                       --------------- Pfam domains
         Sec.struct. author .....eeeee.........hhhhhhhhhhhhhhhhh....eeeee..............eeeeee.hhhhhhhhhhhhh.........eeeeehhhhhhhh... Sec.struct. author
                 SAPs(SNPs) -------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -------------RRM  PDB: A:385-466 UniProt: 385-466                                              --------- PROSITE
               Transcript 1 Exon 1.11  PDB: A:372-431 UniProt: 349-431 [INCOMPLETE]     Exon 1.12  PDB: A:432-475 UniProt: 432-475   Transcript 1
                 1o0p A 372 GHPTEVLCLMNMVLPEELLDDEEYEEIVEDVRDECSKYGLVKSIEIPRPVDGVEVPGCGKIFVEFTSVFDCQKAMQGLTGRKFANRVVVTKYCDPDSYHRRDFW 475
                                   381       391       401       411       421       431       441       451       461       471    

Chain B from PDB  Type:PROTEIN  Length:13
 aligned with SF01_HUMAN | Q15637 from UniProtKB/Swiss-Prot  Length:639

    Alignment length:13
                                    22   
           SF01_HUMAN    13 PSKKRKRSRWNQD  25
               SCOP domains ------------- SCOP domains
               CATH domains ------------- CATH domains
               Pfam domains ------------- Pfam domains
         Sec.struct. author ............. Sec.struct. author
                 SAPs(SNPs) ------------- SAPs(SNPs)
                    PROSITE ------------- PROSITE
               Transcript 2 Exon 2.3a     Transcript 2
                 1o0p B  13 PSKKRKRSRWNQD  25
                                    22   

   Legend:   → Mismatch (orange background)
  - → Gap (green background, '-', border residues have a numbering label)
    → Modified Residue (blue background, lower-case, 'x' indicates undefined single-letter code, labelled with number + name)
  x → Chemical Group (purple background, 'x', labelled with number + name, e.g. ACE or NH2)
  extra numbering lines below/above indicate numbering irregularities and modified residue names etc., number ends below/above '|'

 Classification and Annotation

(-) SCOP Domains  (1, 1)

NMR Structure

(-) CATH Domains  (1, 1)

NMR Structure
(-)
Class: Alpha Beta (26913)

(-) Pfam Domains  (1, 1)

NMR Structure
(-)
Clan: RRM (206)

(-) Gene Ontology  (40, 49)

NMR Structure(hide GO term definitions)
Chain A   (U2AF2_HUMAN | P26368)
molecular function
    GO:0003723    RNA binding    Interacting selectively and non-covalently with an RNA molecule or a portion thereof.
    GO:0019899    enzyme binding    Interacting selectively and non-covalently with any enzyme.
    GO:0003676    nucleic acid binding    Interacting selectively and non-covalently with any nucleic acid.
    GO:0000166    nucleotide binding    Interacting selectively and non-covalently with a nucleotide, any compound consisting of a nucleoside that is esterified with (ortho)phosphate or an oligophosphate at any hydroxyl group on the ribose or deoxyribose.
    GO:0008187    poly-pyrimidine tract binding    Interacting selectively and non-covalently with any stretch of pyrimidines (cytosine or uracil) in an RNA molecule.
    GO:0030628    pre-mRNA 3'-splice site binding    Interacting selectively and non-covalently with the pre-mRNA 3' splice site sequence.
    GO:0005515    protein binding    Interacting selectively and non-covalently with any protein or protein complex (a complex of two or more proteins that may include other nonprotein molecules).
biological process
    GO:0006405    RNA export from nucleus    The directed movement of RNA from the nucleus to the cytoplasm.
    GO:0008380    RNA splicing    The process of removing sections of the primary RNA transcript to remove sequences not present in the mature form of the RNA and joining the remaining sections to form the mature form of the RNA.
    GO:0031124    mRNA 3'-end processing    Any process involved in forming the mature 3' end of an mRNA molecule.
    GO:0006406    mRNA export from nucleus    The directed movement of mRNA from the nucleus to the cytoplasm.
    GO:0006397    mRNA processing    Any process involved in the conversion of a primary mRNA transcript into one or more mature mRNA(s) prior to translation into polypeptide.
    GO:0000398    mRNA splicing, via spliceosome    The joining together of exons from one or more primary transcripts of messenger RNA (mRNA) and the excision of intron sequences, via a spliceosomal mechanism, so that mRNA consisting only of the joined exons is produced.
    GO:0048025    negative regulation of mRNA splicing, via spliceosome    Any process that stops, prevents or reduces the rate or extent of mRNA splicing via a spliceosomal mechanism.
    GO:0033120    positive regulation of RNA splicing    Any process that activates or increases the frequency, rate or extent of RNA splicing.
    GO:1903955    positive regulation of protein targeting to mitochondrion    Any process that activates or increases the frequency, rate or extent of protein targeting to mitochondrion.
    GO:1903146    regulation of mitophagy    Any process that modulates the frequency, rate or extent of mitochondrion degradation (mitophagy).
    GO:0006369    termination of RNA polymerase II transcription    The process in which the synthesis of an RNA molecule by RNA polymerase II using a DNA template is completed.
cellular component
    GO:0000974    Prp19 complex    A protein complex consisting of Prp19 and associated proteins that is involved in the transition from the precatalytic spliceosome to the activated form that catalyzes step 1 of splicing, and which remains associated with the spliceosome through the second catalytic step. It is widely conserved, found in both yeast and mammals, though the exact composition varies. In S. cerevisiae, it contains Prp19p, Ntc20p, Snt309p, Isy1p, Syf2p, Cwc2p, Prp46p, Clf1p, Cef1p, and Syf1p.
    GO:0071004    U2-type prespliceosome    A spliceosomal complex that is formed by association of the 5' splice site with the U1 snRNP, while the branch point sequence is recognized by the U2 snRNP. The prespliceosome includes many proteins in addition to those found in the U1 and U2 snRNPs. Commitment to a given pair of 5' and 3' splice sites occurs at the time of prespliceosome formation.
    GO:0089701    U2AF    A heterodimeric protein complex consisting of conserved large and small U2AF subunits that contributes to spliceosomal RNA splicing by binding to consensus sequences at the 3' splice site. U2AF is required to stabilize the association of the U2 snRNP with the branch point.
    GO:0000243    commitment complex    A spliceosomal complex that is formed by association of the U1 snRNP with the 5' splice site of an unspliced intron in an RNA transcript.
    GO:0016607    nuclear speck    A discrete extra-nucleolar subnuclear domain, 20-50 in number, in which splicing factors are seen to be localized by immunofluorescence microscopy.
    GO:0005654    nucleoplasm    That part of the nuclear content other than the chromosomes or the nucleolus.
    GO:0005634    nucleus    A membrane-bounded organelle of eukaryotic cells in which chromosomes are housed and replicated. In most cells, the nucleus contains all of the cell's chromosomes except the organellar chromosomes, and is the site of RNA synthesis and processing. In some species, or in specialized cell types, RNA metabolism or DNA replication may be absent.
    GO:0005681    spliceosomal complex    Any of a series of ribonucleoprotein complexes that contain snRNA(s) and small nuclear ribonucleoproteins (snRNPs), and are formed sequentially during the spliceosomal splicing of one or more substrate RNAs, and which also contain the RNA substrate(s) from the initial target RNAs of splicing, the splicing intermediate RNA(s), to the final RNA products. During cis-splicing, the initial target RNA is a single, contiguous RNA transcript, whether mRNA, snoRNA, etc., and the released products are a spliced RNA and an excised intron, generally as a lariat structure. During trans-splicing, there are two initial substrate RNAs, the spliced leader RNA and a pre-mRNA.

Chain B   (SF01_HUMAN | Q15637)
molecular function
    GO:0003723    RNA binding    Interacting selectively and non-covalently with an RNA molecule or a portion thereof.
    GO:0042802    identical protein binding    Interacting selectively and non-covalently with an identical protein or proteins.
    GO:0046872    metal ion binding    Interacting selectively and non-covalently with any metal ion.
    GO:0003676    nucleic acid binding    Interacting selectively and non-covalently with any nucleic acid.
    GO:0005515    protein binding    Interacting selectively and non-covalently with any protein or protein complex (a complex of two or more proteins that may include other nonprotein molecules).
    GO:0003714    transcription corepressor activity    Interacting selectively and non-covalently with a repressing transcription factor and also with the basal transcription machinery in order to stop, prevent, or reduce the frequency, rate or extent of transcription. Cofactors generally do not bind the template nucleic acid, but rather mediate protein-protein interactions between repressive transcription factors and the basal transcription machinery.
    GO:0008270    zinc ion binding    Interacting selectively and non-covalently with zinc (Zn) ions.
biological process
    GO:0033327    Leydig cell differentiation    The process in which a relatively unspecialized cell acquires specialized structural and/or functional features of a Leydig cell. A Leydig cell is a testosterone-secreting cell in the interstitial area, between the seminiferous tubules, in the testis.
    GO:0008380    RNA splicing    The process of removing sections of the primary RNA transcript to remove sequences not present in the mature form of the RNA and joining the remaining sections to form the mature form of the RNA.
    GO:0000389    mRNA 3'-splice site recognition    Recognition of the intron 3'-splice site by components of the assembling U2- or U12-type spliceosome.
    GO:0006397    mRNA processing    Any process involved in the conversion of a primary mRNA transcript into one or more mature mRNA(s) prior to translation into polypeptide.
    GO:0000398    mRNA splicing, via spliceosome    The joining together of exons from one or more primary transcripts of messenger RNA (mRNA) and the excision of intron sequences, via a spliceosomal mechanism, so that mRNA consisting only of the joined exons is produced.
    GO:0030238    male sex determination    The specification of male sex of an individual organism.
    GO:1903507    negative regulation of nucleic acid-templated transcription    Any process that stops, prevents or reduces the frequency, rate or extent of nucleic acid-templated transcription.
    GO:0048662    negative regulation of smooth muscle cell proliferation    Any process that stops, prevents or reduces the rate or extent of smooth muscle cell proliferation.
    GO:0050810    regulation of steroid biosynthetic process    Any process that modulates the frequency, rate or extent of the chemical reactions and pathways resulting in the formation of steroids, compounds with a 1,2,cyclopentanoperhydrophenanthrene nucleus.
    GO:0006355    regulation of transcription, DNA-templated    Any process that modulates the frequency, rate or extent of cellular DNA-templated transcription.
    GO:0000245    spliceosomal complex assembly    The aggregation, arrangement and bonding together of a spliceosomal complex, a ribonucleoprotein apparatus that catalyzes nuclear mRNA splicing via transesterification reactions.
    GO:0006351    transcription, DNA-templated    The cellular synthesis of RNA on a template of DNA.
cellular component
    GO:0005654    nucleoplasm    That part of the nuclear content other than the chromosomes or the nucleolus.
    GO:0005634    nucleus    A membrane-bounded organelle of eukaryotic cells in which chromosomes are housed and replicated. In most cells, the nucleus contains all of the cell's chromosomes except the organellar chromosomes, and is the site of RNA synthesis and processing. In some species, or in specialized cell types, RNA metabolism or DNA replication may be absent.
    GO:0005840    ribosome    An intracellular organelle, about 200 A in diameter, consisting of RNA and protein. It is the site of protein biosynthesis resulting from translation of messenger RNA (mRNA). It consists of two subunits, one large and one small, each containing only protein and RNA. Both the ribosome and its subunits are characterized by their sedimentation coefficients, expressed in Svedberg units (symbol: S). Hence, the prokaryotic ribosome (70S) comprises a large (50S) subunit and a small (30S) subunit, while the eukaryotic ribosome (80S) comprises a large (60S) subunit and a small (40S) subunit. Two sites on the ribosomal large subunit are involved in translation, namely the aminoacyl site (A site) and peptidyl site (P site). Ribosomes from prokaryotes, eukaryotes, mitochondria, and chloroplasts have characteristically distinct ribosomal proteins.
    GO:0005681    spliceosomal complex    Any of a series of ribonucleoprotein complexes that contain snRNA(s) and small nuclear ribonucleoproteins (snRNPs), and are formed sequentially during the spliceosomal splicing of one or more substrate RNAs, and which also contain the RNA substrate(s) from the initial target RNAs of splicing, the splicing intermediate RNA(s), to the final RNA products. During cis-splicing, the initial target RNA is a single, contiguous RNA transcript, whether mRNA, snoRNA, etc., and the released products are a spliced RNA and an excised intron, generally as a lariat structure. During trans-splicing, there are two initial substrate RNAs, the spliced leader RNA and a pre-mRNA.

 Visualization

(-) Interactive Views

NMR Structure
  Complete Structure
    Jena3D(integrated viewing of ligand, site, SAP, PROSITE, SCOP information)
    WebMol | AstexViewer[tm]@PDBe
(Java Applets, require no local installation except for Java; loading may be slow)
    STRAP
(Java WebStart application, automatic local installation, requires Java; full application with system access!)
    RasMol
(require local installation)
    Molscript (VRML)
(requires installation of a VRML viewer; select preferred view via VRML and generate a mono or stereo PDF format file)
 
  Ligands, Modified Residues, Ions
(no "Ligands, Modified Residues, Ions" information available for 1o0p)
 
  Sites
(no "Sites" information available for 1o0p)
 
  Cis Peptide Bonds
(no "Cis Peptide Bonds" information available for 1o0p)
 

(-) Still Images

Jmol
  protein: cartoon or spacefill or dots and stick; nucleic acid: cartoon and stick; ligands: spacefill; active site: stick
Molscript
  protein, nucleic acid: cartoon; ligands: spacefill; active site: ball and stick

 Databases and Analysis Tools

(-) Databases

Access by PDB/NDB ID
  1o0p
    Family and Domain InformationProDom | SYSTERS
    General Structural InformationGlycoscienceDB | MMDB | NDB | OCA | PDB | PDBe | PDBj | PDBsum | PDBWiki | PQS | PROTEOPEDIA
    Orientation in MembranesOPM
    Protein SurfaceSURFACE
    Secondary StructureDSSP (structure derived) | HSSP (homology derived)
    Structural GenomicsGeneCensus
    Structural NeighboursCE | VAST
    Structure ClassificationCATH | Dali | SCOP
    Validation and Original DataBMRB Data View | BMRB Restraints Grid | EDS | PROCHECK | RECOORD | WHAT_CHECK
 
Access by UniProt ID/Accession number
  SF01_HUMAN | Q15637
    Comparative Protein Structure ModelsModBase
    Genomic InformationEnsembl
    Protein-protein InteractionDIP
    Sequence, Family and Domain InformationInterPro | Pfam | SMART | UniProtKB/SwissProt
  U2AF2_HUMAN | P26368
    Comparative Protein Structure ModelsModBase
    Genomic InformationEnsembl
    Protein-protein InteractionDIP
    Sequence, Family and Domain InformationInterPro | Pfam | SMART | UniProtKB/SwissProt
 
Access by Enzyme Classificator   (EC Number)
  (no 'Enzyme Classificator' available)
    General Enzyme InformationBRENDA | EC-PDB | Enzyme | IntEnz
    PathwayKEGG | MetaCyc
 
Access by Disease Identifier   (MIM ID)
  (no 'MIM ID' available)
    Disease InformationOMIM
 
Access by GenAge ID
  (no 'GenAge ID' available)
    Age Related InformationGenAge

(-) Analysis Tools

Access by PDB/NDB ID
    Domain InformationXDom
    Interatomic Contacts of Structural UnitsCSU
    Ligand-protein ContactsLPC
    Protein CavitiescastP
    Sequence and Secondary StructurePDBCartoon
    Structure AlignmentSTRAP(Java WebStart application, automatic local installation, requires Java; full application with system access!)
    Structure and Sequence BrowserSTING
 
Access by UniProt ID/Accession number
  SF01_HUMAN | Q15637
    Protein Disorder PredictionDisEMBL | FoldIndex | GLOBPLOT (for more information see DisProt)
  U2AF2_HUMAN | P26368
    Protein Disorder PredictionDisEMBL | FoldIndex | GLOBPLOT (for more information see DisProt)

 Related Entries

(-) Entries Sharing at Least One Protein Chain (UniProt ID)

UniProtKB/Swiss-Prot
        SF01_HUMAN | Q156371k1g 1opi 2m09 2m0g 4fxw 4fxx
        U2AF2_HUMAN | P263681jmt 1opi 1u2f 2g4b 2hzc 2m0g 2u2f 2yh0 2yh1 3vaf 3vag 3vah 3vai 3vaj 3vak 3val 3vam 4fxw 4tu7 4tu8 4tu9 5ev1 5ev2 5ev3 5ev4

(-) Related Entries Specified in the PDB File

(no "Related Entries Specified in the PDB File" available for 1O0P)