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(-) Description

Title :  CRYSTAL STRUCTURE OF TYPE I RESTRICTION ENZYME ECOKI M PROTEIN (EC 2.1.1.72) (M.ECOKI)
 
Authors :  K. R. Rajashankar, R. Kniewel, C. D. Lima, S. K. Burley, New York Sgx Research Center For Structural Genomics (Nysgxrc)
Date :  18 Aug 05  (Deposition) - 30 Aug 05  (Release) - 24 Feb 09  (Revision)
Method :  X-RAY DIFFRACTION
Resolution :  2.80
Chains :  Asym. Unit :  A,B
Biol. Unit 1:  A  (1x)
Biol. Unit 2:  B  (1x)
Keywords :  Structural Genomics; Protein Structure Initiative; Nysgxrc; T824; Q9Pnp0 Restriction Modification Enzyme; Type I Restriction Enzyme Ecoki M Protein; Methyltransferase, Psi, New York Sgx Research Center For Structural Genomics, Transcription, Transferase (Keyword Search: [Gene Ontology, PubMed, Web (Google))
 
Reference :  K. R. Rajashankar, R. Kniewel, C. D. Lima
Crystal Structure Of Type I Restriction Enzyme Ecoki M Protein (Ec 2. 1. 1. 72) (M. Ecoki).
To Be Published
PubMed: search
(for further references see the PDB file header)

(-) Compounds

Molecule 1 - TYPE I RESTRICTION ENZYME ECOKI M PROTEIN
    ChainsA, B
    EC Number2.1.1.72
    EngineeredYES
    Expression SystemESCHERICHIA COLI
    Expression System PlasmidPET T7
    Expression System StrainB834, DE3
    Expression System Taxid562
    Expression System Vector TypePLASMID
    GeneHSDM, HSM
    MutationYES
    Organism ScientificESCHERICHIA COLI
    Organism Taxid562
    SynonymM.ECOKI

 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, 28)

Asymmetric Unit (2, 28)
No.NameCountTypeFull Name
1MSE18Mod. Amino AcidSELENOMETHIONINE
2UNX10Ligand/IonUNKNOWN ATOM OR ION
Biological Unit 1 (2, 19)
No.NameCountTypeFull Name
1MSE9Mod. Amino AcidSELENOMETHIONINE
2UNX10Ligand/IonUNKNOWN ATOM OR ION
Biological Unit 2 (1, 9)
No.NameCountTypeFull Name
1MSE9Mod. Amino AcidSELENOMETHIONINE
2UNX-1Ligand/IonUNKNOWN ATOM OR ION

(-) Sites  (8, 8)

Asymmetric Unit (8, 8)
No.NameEvidenceResiduesDescription
1AC1SOFTWAREUNX A:1002BINDING SITE FOR RESIDUE UNX A 1001
2AC2SOFTWAREARG A:519 , UNX A:1001 , UNX A:1004BINDING SITE FOR RESIDUE UNX A 1002
3AC3SOFTWARETRP A:13 , ARG B:519BINDING SITE FOR RESIDUE UNX A 1003
4AC4SOFTWARETYR A:26 , UNX A:1002BINDING SITE FOR RESIDUE UNX A 1004
5AC5SOFTWAREUNX A:1008BINDING SITE FOR RESIDUE UNX A 1006
6AC6SOFTWAREARG A:519 , UNX A:1009BINDING SITE FOR RESIDUE UNX A 1007
7AC7SOFTWAREUNX A:1006BINDING SITE FOR RESIDUE UNX A 1008
8AC8SOFTWAREARG A:519 , UNX A:1007 , ARG B:519BINDING SITE FOR RESIDUE UNX A 1009

(-) SS Bonds  (0, 0)

(no "SS Bond" information available for 2AR0)

(-) Cis Peptide Bonds  (0, 0)

(no "Cis Peptide Bond" information available for 2AR0)

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (0, 0)

(no "SAP(SNP)/Variant" information available for 2AR0)

(-) PROSITE Motifs  (1, 2)

Asymmetric Unit (1, 2)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1N6_MTASEPS00092 N-6 Adenine-specific DNA methylases signature.T1MK_ECOLI263-269
 
  2A:265-271
B:265-271
Biological Unit 1 (1, 1)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1N6_MTASEPS00092 N-6 Adenine-specific DNA methylases signature.T1MK_ECOLI263-269
 
  1A:265-271
-
Biological Unit 2 (1, 1)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1N6_MTASEPS00092 N-6 Adenine-specific DNA methylases signature.T1MK_ECOLI263-269
 
  1-
B:265-271

(-) Exons   (0, 0)

(no "Exon" information available for 2AR0)

(-) 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:485
 aligned with T1MK_ECOLI | P08957 from UniProtKB/Swiss-Prot  Length:529

    Alignment length:524
                                    13        23        33        43        53        63        73        83        93       103       113       123       133       143       153       163       173       183       193       203       213       223       233       243       253       263       273       283       293       303       313       323       333       343       353       363       373       383       393       403       413       423       433       443       453       463       473       483       493       503       513       523    
           T1MK_ECOLI     4 NDLVAKLWKLCDNLRDGGVSYQNYVNELASLLFLKMCKETGQEAEYLPEGYRWDDLKSRIGQEQLQFYRKMLVHLGEDDKKLVQAVFHNVSTTITEPKQITALVSNMDSLDWYNGAHGKSRDDFGDMYEGLLQKNANETKSGAGQYFTPRPLIKTIIHLLKPQPREVVQDPAAGTAGFLIEADRYVKSQTNDLDDLDGDTQDFQIHRAFIGLELVPGTRRLALMNCLLHDIEGNLDHGGAIRLGNTLGSDGENLPKAHIVATNPPFGSAAGTNITRTFVHPTSNKQLCFMQHIIETLHPGGRAAVVVPDNVLFEGGKGTDIRRDLMDKCHLHTILRLPTGIFYAQGVKTNVLFFTKGTVANPNQDKNCTDDVWVYDLRTNMPSFGKRTPFTDEHLQPFERVYGEDPHGLSPRTEGEWSFNAEETEVADSEENKNTDQHLATSRWRKFSREWIRTAKSDSLDISWLKDKDSIDADSLPEPDVLAAEAMGELVQALSELDALMRELGASDEADLQRQLLEEAFGGV 527
               SCOP domains d2ar0a1 A:6-529 M.EcoKI                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      SCOP domains
               CATH domains -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- CATH domains
               Pfam domains -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author hhhhhhhhhhhhhhhh......hhhhhhhhhhhhhhhhhhhhhhhhh....hhhhhhh.hhhhhhhhhhhhhhhhh...hhhhhhhhh.......hhhhhhhhhhhhhh...--------------------------------....hhhhhhhhhhhhh......eee.....hhhhhhhhhhhhh........hhhhhhhhhhh.eeeee.hhhhhhhhhhhhhh.....hhhhh..eee....hhhhhh...eeeeee.....................hhhhhhhhhhhhheeeeeeeeeeeehhhhhh.hhhhhhhhhhhhheeeeeeee............eeeeeeee..............eeeeee..............hhhhhhhhhhhhh.....................ee..hhhhh....hhhhh.eeeeehhhhhhh.........ee...-------.hhhhhhhhhhhhhhhhhhhhhhhhhh...hhhhhhhhhhhhh..... Sec.struct. author
                 SAPs(SNPs) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------N6_MTAS------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ PROSITE
                 Transcript -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 2ar0 A   6 NDLVAKLWKLCDNLRDGGVSYQNYVNELASLLFLKmCKETGQEAEYLPEGYRWDDLKSRIGQEQLQFYRKmLVHLGEDDKKLVQAVFHNVSTTITEPKQITALVSNmDSLDW--------------------------------QYFTPRPLIKTIIHLLKPQPREVVQDPAAGTAGFLIEADRYVKSQTNDLDDLDGDTQDFQIHRAFIGLELVPGTRRLALmNCLLHDIEGNLDHGGAIRLGNTLGSDGENLPKAHIVATNPPFGSAAGTNITRTFVHPTSNKQLCFmQHIIETLHPGGRAAVVVPDNVLFEGGKGTDIRRDLmDKCHLHTILRLPTGIFYAQGVKTNVLFFTKGTVANPNQDKNCTDDVWVYDLRTNmPSFGKRTPFTDEHLQPFERVYGEDPHGLSPRTEGEWSFNAEETEVADSEENKNTDQHLATSRWRKFSREWIRTAKSDSLDISWLKDKD-------PEPDVLAAEAmGELVQALSELDALmRELGASDEADLQRQLLEEAFGGV 529
                                    15        25        35     |  45        55        65        75|       85        95       105      |115 |       -         -         -    |  155       165       175       185       195       205       215       225   |   235       245       255       265       275       285       295       305       315       325     | 335       345       355       365       375       385|      395       405       415       425       435       445       455       465        |-      |485      |495       505|      515       525    
                                                              41-MSE                             76-MSE                             112-MSE7                              150                                                                            229-MSE                                                           295-MSE                             331-MSE                                                386-MSE                                                                                 474     482       492-MSE       506-MSE                   

Chain B from PDB  Type:PROTEIN  Length:483
 aligned with T1MK_ECOLI | P08957 from UniProtKB/Swiss-Prot  Length:529

    Alignment length:522
                                    13        23        33        43        53        63        73        83        93       103       113       123       133       143       153       163       173       183       193       203       213       223       233       243       253       263       273       283       293       303       313       323       333       343       353       363       373       383       393       403       413       423       433       443       453       463       473       483       493       503       513       523  
           T1MK_ECOLI     4 NDLVAKLWKLCDNLRDGGVSYQNYVNELASLLFLKMCKETGQEAEYLPEGYRWDDLKSRIGQEQLQFYRKMLVHLGEDDKKLVQAVFHNVSTTITEPKQITALVSNMDSLDWYNGAHGKSRDDFGDMYEGLLQKNANETKSGAGQYFTPRPLIKTIIHLLKPQPREVVQDPAAGTAGFLIEADRYVKSQTNDLDDLDGDTQDFQIHRAFIGLELVPGTRRLALMNCLLHDIEGNLDHGGAIRLGNTLGSDGENLPKAHIVATNPPFGSAAGTNITRTFVHPTSNKQLCFMQHIIETLHPGGRAAVVVPDNVLFEGGKGTDIRRDLMDKCHLHTILRLPTGIFYAQGVKTNVLFFTKGTVANPNQDKNCTDDVWVYDLRTNMPSFGKRTPFTDEHLQPFERVYGEDPHGLSPRTEGEWSFNAEETEVADSEENKNTDQHLATSRWRKFSREWIRTAKSDSLDISWLKDKDSIDADSLPEPDVLAAEAMGELVQALSELDALMRELGASDEADLQRQLLEEAFG 525
               SCOP domains d2ar0b_ B: M.EcoKI                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         SCOP domains
               CATH domains ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Pfam domains
         Sec.struct. author hhhhhhhhhhhhhhhh......hhhhhhhhhhhhhhhhhhhhhhhhh....hhhhhhh..hhhhhhhhhhhhhhhh...hhhhhhhhh.......hhhhhhhhhhhhhh...--------------------------------....hhhhhhhhhhhhh......eee.....hhhhhhhhhhhhh........hhhhhhhhhhh.eeeee.hhhhhhhhhhhhhh.....hhhhh..eee....hhhhhh...eeeeee.....................hhhhhhhhhhhhheeeeeeeeeeeehhhhhh.hhhhhhhhhhhhheeeeeeee............eeeeeeee..............eeeeee..............hhhhhhhhhhhhh.....................ee..hhhhh....hhhhh.eeeeehhhhhhh.........ee...-------.hhhhhhhhhhhhhhhhhhhhhhhhhh......hhhhhh....... Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ SAPs(SNPs)
                    PROSITE -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------N6_MTAS---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Transcript
                 2ar0 B   6 NDLVAKLWKLCDNLRDGGVSYQNYVNELASLLFLKmCKETGQEAEYLPEGYRWDDLKSRIGQEQLQFYRKmLVHLGEDDKKLVQAVFHNVSTTITEPKQITALVSNmDSLDW--------------------------------QYFTPRPLIKTIIHLLKPQPREVVQDPAAGTAGFLIEADRYVKSQTNDLDDLDGDTQDFQIHRAFIGLELVPGTRRLALmNCLLHDIEGNLDHGGAIRLGNTLGSDGENLPKAHIVATNPPFGSAAGTNITRTFVHPTSNKQLCFmQHIIETLHPGGRAAVVVPDNVLFEGGKGTDIRRDLmDKCHLHTILRLPTGIFYAQGVKTNVLFFTKGTVANPNQDKNCTDDVWVYDLRTNmPSFGKRTPFTDEHLQPFERVYGEDPHGLSPRTEGEWSFNAEETEVADSEENKNTDQHLATSRWRKFSREWIRTAKSDSLDISWLKDKD-------PEPDVLAAEAmGELVQALSELDALmRELGASDEADLQRQLLEEAFG 527
                                    15        25        35     |  45        55        65        75|       85        95       105      |115 |       -         -         -    |  155       165       175       185       195       205       215       225   |   235       245       255       265       275       285       295       305       315       325     | 335       345       355       365       375       385|      395       405       415       425       435       445       455       465        |-      |485      |495       505|      515       525  
                                                              41-MSE                             76-MSE                             112-MSE7                              150                                                                            229-MSE                                                           295-MSE                             331-MSE                                                386-MSE                                                                                 474     482       492-MSE       506-MSE                 

   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  (0, 0)

(no "CATH Domain" information available for 2AR0)

(-) Pfam Domains  (0, 0)

(no "Pfam Domain" information available for 2AR0)

(-) Gene Ontology  (11, 11)

Asymmetric Unit(hide GO term definitions)
Chain A,B   (T1MK_ECOLI | P08957)
molecular function
    GO:0003677    DNA binding    Any molecular function by which a gene product interacts selectively and non-covalently with DNA (deoxyribonucleic acid).
    GO:0008170    N-methyltransferase activity    Catalysis of the transfer of a methyl group to the nitrogen atom of an acceptor molecule.
    GO:0008168    methyltransferase activity    Catalysis of the transfer of a methyl group to an acceptor molecule.
    GO:0003676    nucleic acid binding    Interacting selectively and non-covalently with any nucleic acid.
    GO:0009007    site-specific DNA-methyltransferase (adenine-specific) activity    Catalysis of the reaction: S-adenosyl-L-methionine + DNA adenine = S-adenosyl-L-homocysteine + DNA 6-methylaminopurine.
    GO:0016740    transferase activity    Catalysis of the transfer of a group, e.g. a methyl group, glycosyl group, acyl group, phosphorus-containing, or other groups, from one compound (generally regarded as the donor) to another compound (generally regarded as the acceptor). Transferase is the systematic name for any enzyme of EC class 2.
biological process
    GO:0006306    DNA methylation    The covalent transfer of a methyl group to either N-6 of adenine or C-5 or N-4 of cytosine.
    GO:0032775    DNA methylation on adenine    The covalent transfer of a methyl group to N-6 of adenine in a DNA molecule.
    GO:0009307    DNA restriction-modification system    A defense process found in many bacteria and archaea that protects the organism from invading foreign DNA by cleaving it with a restriction endonuclease. The organism's own DNA is protected by methylation of a specific nucleotide, which occurs immediately following replication, in the same target site as the restriction enzyme.
    GO:0032259    methylation    The process in which a methyl group is covalently attached to a molecule.
cellular component
    GO:0005829    cytosol    The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes.

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 Related Entries

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

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        T1MK_ECOLI | P089572y7c 2y7h

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