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(-) Description

Title :  CRYSTAL STRUCTURE OF THE COMPLEX BETWEEN CALYCULIN A AND THE CATALYTIC SUBUNIT OF PROTEIN PHOSPHATASE 1
 
Authors :  A. Kita, S. Matsunaga, A. Takai, H. Kataiwa, T. Wakimoto, N. Fusetani, M. Isobe, K. Miki
Date :  09 Jan 02  (Deposition) - 22 May 02  (Release) - 24 Feb 09  (Revision)
Method :  X-RAY DIFFRACTION
Resolution :  2.00
Chains :  Asym. Unit :  A,B
Biol. Unit 1:  A  (1x)
Biol. Unit 2:  B  (1x)
Keywords :  Hydrolase-Inhibitor Complex (Keyword Search: [Gene Ontology, PubMed, Web (Google))
 
Reference :  A. Kita, S. Matsunaga, A. Takai, H. Kataiwa, T. Wakimoto, N. Fusetani, M. Isobe, K. Miki
Crystal Structure Of The Complex Between Calyculin A And The Catalytic Subunit Of Protein Phosphatase 1.
Structure V. 10 715 2002
PubMed-ID: 12015153  |  Reference-DOI: 10.1016/S0969-2126(02)00764-5
(for further references see the PDB file header)

(-) Compounds

Molecule 1 - SERINE/THREONINE PROTEIN PHOSPHATASE 1 GAMMA (PP1-GAMMA) CATALYTIC SUBUNIT
    ChainsA, B
    EC Number3.1.3.16
    EngineeredYES
    Expression SystemESCHERICHIA COLI
    Expression System Taxid562
    Organism CommonHUMAN
    Organism ScientificHOMO SAPIENS
    Organism Taxid9606

 Structural Features

(-) Chains, Units

  12
Asymmetric Unit AB
Biological Unit 1 (1x)A 
Biological Unit 2 (1x) B

Summary Information (see also Sequences/Alignments below)

(-) Ligands, Modified Residues, Ions  (2, 6)

Asymmetric Unit (2, 6)
No.NameCountTypeFull Name
1CYU2Ligand/IonCALYCULIN A
2MN4Ligand/IonMANGANESE (II) ION
Biological Unit 1 (1, 1)
No.NameCountTypeFull Name
1CYU1Ligand/IonCALYCULIN A
2MN-1Ligand/IonMANGANESE (II) ION
Biological Unit 2 (1, 1)
No.NameCountTypeFull Name
1CYU1Ligand/IonCALYCULIN A
2MN-1Ligand/IonMANGANESE (II) ION

(-) Sites  (6, 6)

Asymmetric Unit (6, 6)
No.NameEvidenceResiduesDescription
1AC1SOFTWAREASP A:64 , HIS A:66 , ASP A:92 , MN A:402 , HOH A:601 , HOH A:602BINDING SITE FOR RESIDUE MN A 401
2AC2SOFTWAREASP A:92 , ASN A:124 , HIS A:173 , HIS A:248 , MN A:401 , HOH A:601BINDING SITE FOR RESIDUE MN A 402
3AC3SOFTWAREASP B:64 , HIS B:66 , ASP B:92 , MN B:402 , HOH B:603 , HOH B:604BINDING SITE FOR RESIDUE MN B 401
4AC4SOFTWAREASP B:92 , ASN B:124 , HIS B:173 , HIS B:248 , MN B:401 , HOH B:603BINDING SITE FOR RESIDUE MN B 402
5AC5SOFTWAREARG A:96 , SER A:129 , ILE A:130 , TYR A:134 , VAL A:195 , PRO A:196 , ASP A:197 , ASP A:208 , PRO A:209 , ASN A:219 , ASP A:220 , ARG A:221 , VAL A:223 , THR A:226 , HIS A:248 , GLN A:249 , TYR A:272 , HOH A:601 , HOH A:602 , HOH A:607 , HOH A:608 , HOH A:612 , ARG B:132 , LYS B:141 , HOH B:670BINDING SITE FOR RESIDUE CYU A 501
6AC6SOFTWAREARG A:132 , LYS A:141 , HOH A:676 , ARG B:96 , SER B:129 , ILE B:130 , TYR B:134 , VAL B:195 , PRO B:196 , ASP B:197 , ASN B:219 , ASP B:220 , ARG B:221 , THR B:226 , HIS B:248 , GLN B:249 , TYR B:272 , HOH B:603 , HOH B:604 , HOH B:614 , HOH B:615 , HOH B:642BINDING SITE FOR RESIDUE CYU B 1501

(-) SS Bonds  (0, 0)

(no "SS Bond" information available for 1IT6)

(-) Cis Peptide Bonds  (6, 6)

Asymmetric Unit
No.Residues
1Ala A:57 -Pro A:58
2Pro A:82 -Pro A:83
3Arg A:191 -Pro A:192
4Ala B:57 -Pro B:58
5Pro B:82 -Pro B:83
6Arg B:191 -Pro B:192

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (1, 2)

Asymmetric Unit (1, 2)
  dbSNPPDB
No.SourceVariant IDVariantUniProt IDStatusIDChainVariant
1UniProtVAR_051734F152SPP1G_HUMANPolymorphism11558237A/BF152S

  SNP/SAP Summary Statistics (UniProtKB/Swiss-Prot)
Biological Unit 1 (1, 1)
  dbSNPPDB
No.SourceVariant IDVariantUniProt IDStatusIDChainVariant
1UniProtVAR_051734F152SPP1G_HUMANPolymorphism11558237AF152S

  SNP/SAP Summary Statistics (UniProtKB/Swiss-Prot)
Biological Unit 2 (1, 1)
  dbSNPPDB
No.SourceVariant IDVariantUniProt IDStatusIDChainVariant
1UniProtVAR_051734F152SPP1G_HUMANPolymorphism11558237BF152S

  SNP/SAP Summary Statistics (UniProtKB/Swiss-Prot)

(-) PROSITE Motifs  (1, 2)

Asymmetric Unit (1, 2)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1SER_THR_PHOSPHATASEPS00125 Serine/threonine specific protein phosphatases signature.PP1G_HUMAN121-126
 
  2A:121-126
B:121-126
Biological Unit 1 (1, 1)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1SER_THR_PHOSPHATASEPS00125 Serine/threonine specific protein phosphatases signature.PP1G_HUMAN121-126
 
  1A:121-126
-
Biological Unit 2 (1, 1)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1SER_THR_PHOSPHATASEPS00125 Serine/threonine specific protein phosphatases signature.PP1G_HUMAN121-126
 
  1-
B:121-126

(-) Exons   (7, 14)

Asymmetric Unit (7, 14)
 ENSEMBLUniProtKBPDB
No.Transcript IDExonExon IDGenome LocationLengthIDLocationLengthCountLocationLength
1.1ENST000003350071ENSE00001559755chr12:111180757-111180458300PP1G_HUMAN1-19192A:7-19
B:7-19
13
13
1.2ENST000003350072ENSE00001332986chr12:111169706-111169575132PP1G_HUMAN19-63452A:19-63
B:19-63
45
45
1.3ENST000003350073ENSE00001783751chr12:111168564-111168334231PP1G_HUMAN63-140782A:63-140
B:63-140
78
78
1.4ENST000003350074ENSE00001804069chr12:111162569-111162465105PP1G_HUMAN140-175362A:140-175
B:140-175
36
36
1.5ENST000003350075ENSE00001332982chr12:111160500-111160277224PP1G_HUMAN175-249752A:175-249
B:175-249
75
75
1.6ENST000003350076ENSE00001611630chr12:111160074-111159940135PP1G_HUMAN250-294452A:250-294
B:250-294
45
45
1.7bENST000003350077bENSE00001408003chr12:111158970-1111576151356PP1G_HUMAN295-323292A:295-299
B:295-299
5
5

(-) Sequences/Alignments

Asymmetric Unit
   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:293
 aligned with PP1G_HUMAN | P36873 from UniProtKB/Swiss-Prot  Length:323

    Alignment length:293
                                    16        26        36        46        56        66        76        86        96       106       116       126       136       146       156       166       176       186       196       206       216       226       236       246       256       266       276       286       296   
           PP1G_HUMAN     7 LNIDSIIQRLLEVRGSKPGKNVQLQENEIRGLCLKSREIFLSQPILLELEAPLKICGDIHGQYYDLLRLFEYGGFPPESNYLFLGDYVDRGKQSLETICLLLAYKIKYPENFFLLRGNHECASINRIYGFYDECKRRYNIKLWKTFTDCFNCLPIAAIVDEKIFCCHGGLSPDLQSMEQIRRIMRPTDVPDQGLLCDLLWSDPDKDVLGWGENDRGVSFTFGAEVVAKFLHKHDLDLICRAHQVVEDGYEFFAKRQLVTLFSAPNYCGEFDNAGAMMSVDETLMCSFQILKPA 299
               SCOP domains d1it6a_ A: Protein phosphatase-1 (PP-1)                                                                                                                                                                                                                                                               SCOP domains
               CATH domains 1it6A00 A:7-299  [code=3.60.21.10, no name defined]                                                                                                                                                                                                                                                   CATH domains
               Pfam domains ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author .hhhhhhhhhhhh...........hhhhhhhhhhhhhhhhhhh..eeee...eeee.....hhhhhhhhhhhhh......eee.........hhhhhhhhhhhhhhhh...eee......hhhhhh..hhhhhhhhhhhhhhhhhhhhhhh....eeee...eeee.........hhhhhhh..........hhhhhhhhhee......eee......eeehhhhhhhhhhhhh..eeee........eeee....eeee....hhhhh....eeeeee.....eeeeee... Sec.struct. author
                 SAPs(SNPs) -------------------------------------------------------------------------------------------------------------------------------------------------S--------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------------------------------------------------------SER_TH----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
           Transcript 1 (1) Exon 1.1     -------------------------------------------Exon 1.3  PDB: A:63-140 UniProt: 63-140                                       ----------------------------------Exon 1.5  PDB: A:175-249 UniProt: 175-249                                  Exon 1.6  PDB: A:250-294 UniProt: 250-294    1.7b  Transcript 1 (1)
           Transcript 1 (2) ------------Exon 1.2  PDB: A:19-63 UniProt: 19-63        ----------------------------------------------------------------------------Exon 1.4  PDB: A:140-175            ---------------------------------------------------------------------------------------------------------------------------- Transcript 1 (2)
                 1it6 A   7 LNIDSIIQRLLEVRGSKPGKNVQLQENEIRGLCLKSREIFLSQPILLELEAPLKICGDIHGQYYDLLRLFEYGGFPPESNYLFLGDYVDRGKQSLETICLLLAYKIKYPENFFLLRGNHECASINRIYGFYDECKRRYNIKLWKTFTDCFNCLPIAAIVDEKIFCCHGGLSPDLQSMEQIRRIMRPTDVPDQGLLCDLLWSDPDKDVLGWGENDRGVSFTFGAEVVAKFLHKHDLDLICRAHQVVEDGYEFFAKRQLVTLFSAPNYCGEFDNAGAMMSVDETLMCSFQILKPA 299
                                    16        26        36        46        56        66        76        86        96       106       116       126       136       146       156       166       176       186       196       206       216       226       236       246       256       266       276       286       296   

Chain B from PDB  Type:PROTEIN  Length:293
 aligned with PP1G_HUMAN | P36873 from UniProtKB/Swiss-Prot  Length:323

    Alignment length:293
                                    16        26        36        46        56        66        76        86        96       106       116       126       136       146       156       166       176       186       196       206       216       226       236       246       256       266       276       286       296   
           PP1G_HUMAN     7 LNIDSIIQRLLEVRGSKPGKNVQLQENEIRGLCLKSREIFLSQPILLELEAPLKICGDIHGQYYDLLRLFEYGGFPPESNYLFLGDYVDRGKQSLETICLLLAYKIKYPENFFLLRGNHECASINRIYGFYDECKRRYNIKLWKTFTDCFNCLPIAAIVDEKIFCCHGGLSPDLQSMEQIRRIMRPTDVPDQGLLCDLLWSDPDKDVLGWGENDRGVSFTFGAEVVAKFLHKHDLDLICRAHQVVEDGYEFFAKRQLVTLFSAPNYCGEFDNAGAMMSVDETLMCSFQILKPA 299
               SCOP domains d1it6b_ B: Protein phosphatase-1 (PP-1)                                                                                                                                                                                                                                                               SCOP domains
               CATH domains 1it6B00 B:7-299  [code=3.60.21.10, no name defined]                                                                                                                                                                                                                                                   CATH domains
               Pfam domains ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author .hhhhhhhhhhh............hhhhhhhhhhhhhhhhhhh..eeee...eeee.....hhhhhhhhhhhhh......eee.........hhhhhhhhhhhhhhhh...eee......hhhhhh..hhhhhhhhhhhhhhhhhhhhhhh....eeee...eeee.........hhhhhhh..........hhhhhhhhhee......eee......eeehhhhhhhhhhhhh..eeee........eeee....eeee....hhhhh....eeeeee.....eeeeee... Sec.struct. author
                 SAPs(SNPs) -------------------------------------------------------------------------------------------------------------------------------------------------S--------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------------------------------------------------------SER_TH----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
           Transcript 1 (1) Exon 1.1     -------------------------------------------Exon 1.3  PDB: B:63-140 UniProt: 63-140                                       ----------------------------------Exon 1.5  PDB: B:175-249 UniProt: 175-249                                  Exon 1.6  PDB: B:250-294 UniProt: 250-294    1.7b  Transcript 1 (1)
           Transcript 1 (2) ------------Exon 1.2  PDB: B:19-63 UniProt: 19-63        ----------------------------------------------------------------------------Exon 1.4  PDB: B:140-175            ---------------------------------------------------------------------------------------------------------------------------- Transcript 1 (2)
                 1it6 B   7 LNIDSIIQRLLEVRGSKPGKNVQLQENEIRGLCLKSREIFLSQPILLELEAPLKICGDIHGQYYDLLRLFEYGGFPPESNYLFLGDYVDRGKQSLETICLLLAYKIKYPENFFLLRGNHECASINRIYGFYDECKRRYNIKLWKTFTDCFNCLPIAAIVDEKIFCCHGGLSPDLQSMEQIRRIMRPTDVPDQGLLCDLLWSDPDKDVLGWGENDRGVSFTFGAEVVAKFLHKHDLDLICRAHQVVEDGYEFFAKRQLVTLFSAPNYCGEFDNAGAMMSVDETLMCSFQILKPA 299
                                    16        26        36        46        56        66        76        86        96       106       116       126       136       146       156       166       176       186       196       206       216       226       236       246       256       266       276       286       296   

   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, 2)

Asymmetric Unit

(-) CATH Domains  (1, 2)

Asymmetric Unit
(-)
Class: Alpha Beta (26913)

(-) Pfam Domains  (0, 0)

(no "Pfam Domain" information available for 1IT6)

(-) Gene Ontology  (46, 46)

Asymmetric Unit(hide GO term definitions)
Chain A,B   (PP1G_HUMAN | P36873)
molecular function
    GO:0016787    hydrolase activity    Catalysis of the hydrolysis of various bonds, e.g. C-O, C-N, C-C, phosphoric anhydride bonds, etc. Hydrolase is the systematic name for any enzyme of EC class 3.
    GO:0005521    lamin binding    Interacting selectively and non-covalently with lamin; any of a group of intermediate-filament proteins that form the fibrous matrix on the inner surface of the nuclear envelope.
    GO:0046872    metal ion binding    Interacting selectively and non-covalently with any metal ion.
    GO:0016791    phosphatase activity    Catalysis of the hydrolysis of phosphoric monoesters, releasing inorganic phosphate.
    GO:0004721    phosphoprotein phosphatase activity    Catalysis of the reaction: a phosphoprotein + H2O = a protein + phosphate. Together with protein kinases, these enzymes control the state of phosphorylation of cell proteins and thereby provide an important mechanism for regulating cellular activity.
    GO:0008022    protein C-terminus binding    Interacting selectively and non-covalently with a protein C-terminus, the end of any peptide chain at which the 1-carboxy function of a constituent amino acid is not attached in peptide linkage to another amino-acid residue.
    GO:0047485    protein N-terminus binding    Interacting selectively and non-covalently with a protein N-terminus, the end of any peptide chain at which the 2-amino (or 2-imino) function of a constituent amino acid is not attached in peptide linkage to another amino-acid residue.
    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:0032403    protein complex binding    Interacting selectively and non-covalently with any protein complex (a complex of two or more proteins that may include other nonprotein molecules).
    GO:0019904    protein domain specific binding    Interacting selectively and non-covalently with a specific domain of a protein.
    GO:0019901    protein kinase binding    Interacting selectively and non-covalently with a protein kinase, any enzyme that catalyzes the transfer of a phosphate group, usually from ATP, to a protein substrate.
    GO:0008157    protein phosphatase 1 binding    Interacting selectively and non-covalently with the enzyme protein phosphatase 1.
    GO:0019903    protein phosphatase binding    Interacting selectively and non-covalently with any protein phosphatase.
    GO:0004722    protein serine/threonine phosphatase activity    Catalysis of the reaction: protein serine phosphate + H2O = protein serine + phosphate, and protein threonine phosphate + H2O = protein threonine + phosphate.
biological process
    GO:0005975    carbohydrate metabolic process    The chemical reactions and pathways involving carbohydrates, any of a group of organic compounds based of the general formula Cx(H2O)y. Includes the formation of carbohydrate derivatives by the addition of a carbohydrate residue to another molecule.
    GO:0007049    cell cycle    The progression of biochemical and morphological phases and events that occur in a cell during successive cell replication or nuclear replication events. Canonically, the cell cycle comprises the replication and segregation of genetic material followed by the division of the cell, but in endocycles or syncytial cells nuclear replication or nuclear division may not be followed by cell division.
    GO:0051301    cell division    The process resulting in division and partitioning of components of a cell to form more cells; may or may not be accompanied by the physical separation of a cell into distinct, individually membrane-bounded daughter cells.
    GO:0032922    circadian regulation of gene expression    Any process that modulates the frequency, rate or extent of gene expression such that an expression pattern recurs with a regularity of approximately 24 hours.
    GO:0043153    entrainment of circadian clock by photoperiod    The synchronization of a circadian rhythm to photoperiod, the intermittent cycle of light (day) and dark (night).
    GO:0005977    glycogen metabolic process    The chemical reactions and pathways involving glycogen, a polydisperse, highly branched glucan composed of chains of D-glucose residues in alpha-(1->4) glycosidic linkage, joined together by alpha-(1->6) glycosidic linkages.
    GO:0030182    neuron differentiation    The process in which a relatively unspecialized cell acquires specialized features of a neuron.
    GO:0006470    protein dephosphorylation    The process of removing one or more phosphoric residues from a protein.
    GO:0042752    regulation of circadian rhythm    Any process that modulates the frequency, rate or extent of a circadian rhythm. A circadian rhythm is a biological process in an organism that recurs with a regularity of approximately 24 hours.
    GO:0046822    regulation of nucleocytoplasmic transport    Any process that modulates the frequency, rate or extent of the directed movement of substances between the nucleus and the cytoplasm.
    GO:0048511    rhythmic process    Any process pertinent to the generation and maintenance of rhythms in the physiology of an organism.
    GO:0007062    sister chromatid cohesion    The cell cycle process in which the sister chromatids of a replicated chromosome become tethered to each other.
cellular component
    GO:0070688    MLL5-L complex    A protein complex that can methylate lysine-4 of histone H3 and plays an essential role in retinoic-acid-induced granulopoiesis. MLL5 is the catalytic methyltransferase subunit, and the complex also contains serine/threonine kinase 38 (STK38), protein phosphatase 1 catalytic subunits, the host cell factor-1 N-terminal subunit, beta-actin, and O-GlcNAc transferase; the human genes encoding the subunits are MLL5, STK38, PPP1CA, PPP1CB, PPP1CC, HCFC1, ACTB and OGT, respectively.
    GO:0072357    PTW/PP1 phosphatase complex    A protein serine/threonine phosphatase complex that contains a catalytic subunit (PPP1CA, PPP1CB or PPP1CC) and the regulatory subunits PPP1R10 (PNUTS), TOX4 and WDR82, and plays a role in the control of chromatin structure and cell cycle progression during the transition from mitosis into interphase.
    GO:0005694    chromosome    A structure composed of a very long molecule of DNA and associated proteins (e.g. histones) that carries hereditary information.
    GO:0000775    chromosome, centromeric region    The region of a chromosome that includes the centromeric DNA and associated proteins. In monocentric chromosomes, this region corresponds to a single area of the chromosome, whereas in holocentric chromosomes, it is evenly distributed along the chromosome.
    GO:0032154    cleavage furrow    The cleavage furrow is a plasma membrane invagination at the cell division site. The cleavage furrow begins as a shallow groove and eventually deepens to divide the cytoplasm.
    GO:0000777    condensed chromosome kinetochore    A multisubunit complex that is located at the centromeric region of a condensed chromosome and provides an attachment point for the spindle microtubules.
    GO:0005737    cytoplasm    All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
    GO:0005829    cytosol    The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes.
    GO:0043197    dendritic spine    A small, membranous protrusion from a dendrite that forms a postsynaptic compartment - typically receiving input from a single presynapse. They function as partially isolated biochemical and an electrical compartments. Spine morphology is variable including "thin", "stubby", "mushroom", and "branched", with a continuum of intermediate morphologies. They typically terminate in a bulb shape, linked to the dendritic shaft by a restriction. Spine remodeling is though to be involved in synaptic plasticity.
    GO:0005925    focal adhesion    Small region on the surface of a cell that anchors the cell to the extracellular matrix and that forms a point of termination of actin filaments.
    GO:0000776    kinetochore    A multisubunit complex that is located at the centromeric region of DNA and provides an attachment point for the spindle microtubules.
    GO:0030496    midbody    A thin cytoplasmic bridge formed between daughter cells at the end of cytokinesis. The midbody forms where the contractile ring constricts, and may persist for some time before finally breaking to complete cytokinesis.
    GO:0005741    mitochondrial outer membrane    The outer, i.e. cytoplasm-facing, lipid bilayer of the mitochondrial envelope.
    GO:0005739    mitochondrion    A semiautonomous, self replicating organelle that occurs in varying numbers, shapes, and sizes in the cytoplasm of virtually all eukaryotic cells. It is notably the site of tissue respiration.
    GO:0000784    nuclear chromosome, telomeric region    The terminal region of a linear nuclear chromosome that includes the telomeric DNA repeats and associated proteins.
    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:0005730    nucleolus    A small, dense body one or more of which are present in the nucleus of eukaryotic cells. It is rich in RNA and protein, is not bounded by a limiting membrane, and is not seen during mitosis. Its prime function is the transcription of the nucleolar DNA into 45S ribosomal-precursor RNA, the processing of this RNA into 5.8S, 18S, and 28S components of ribosomal RNA, and the association of these components with 5S RNA and proteins synthesized outside the nucleolus. This association results in the formation of ribonucleoprotein precursors; these pass into the cytoplasm and mature into the 40S and 60S subunits of the ribosome.
    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:0043234    protein complex    A stable macromolecular complex composed (only) of two or more polypeptide subunits along with any covalently attached molecules (such as lipid anchors or oligosaccharide) or non-protein prosthetic groups (such as nucleotides or metal ions). Prosthetic group in this context refers to a tightly bound cofactor. The component polypeptide subunits may be identical.

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        PP1G_HUMAN | P368731jk7 1u32 2bcd 2bdx 4ut2 4ut3 5inb 5j28

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