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(-) Description

Title :  T4DAM IN COMPLEX WITH SINEFUNGIN AND 16-MER OLIGONUCLEOTIDE SHOWING SEMI-SPECIFIC AND SPECIFIC CONTACT AND FLIPPED BASE
 
Authors :  J. R. Horton, K. Liebert, S. Hattman, A. Jeltsch, X. Cheng
Date :  03 Jan 05  (Deposition) - 17 May 05  (Release) - 13 Jul 11  (Revision)
Method :  X-RAY DIFFRACTION
Resolution :  3.09
Chains :  Asym. Unit :  A,B,D,E,F,G,H,I
Biol. Unit 1:  A,F  (1x)
Biol. Unit 2:  B,G  (1x)
Biol. Unit 3:  D,H  (1x)
Biol. Unit 4:  E,I  (1x)
Keywords :  T4Dam, Methyltransferase, Dna, Protein-Dna Complex, Base-Flipping, Transferase-Dna Complex (Keyword Search: [Gene Ontology, PubMed, Web (Google))
 
Reference :  J. R. Horton, K. Liebert, S. Hattman, A. Jeltsch, X. Cheng
Transition From Nonspecific To Specific Dna Interactions Along The Substrate-Recognition Pathway Of Dam Methyltransferase.
Cell(Cambridge, Mass. ) V. 121 349 2005
PubMed-ID: 15882618  |  Reference-DOI: 10.1016/J.CELL.2005.02.021
(for further references see the PDB file header)

(-) Compounds

Molecule 1 - 5'-D(P*TP*CP*AP*CP*AP*GP*GP*AP*TP*CP*CP*TP*GP*TP*GP*A)-3'
    ChainsF, G, H, I
    EngineeredYES
    Other DetailsSYNTHESIZED BY NEW ENGLAND BIOLABS
    SyntheticYES
 
Molecule 2 - DNA ADENINE METHYLASE
    ChainsA, B, D, E
    EC Number2.1.1.72
    EngineeredYES
    Expression SystemESCHERICHIA COLI
    Expression System PlasmidPJW2
    Expression System StrainGM 2971
    Expression System Taxid562
    Expression System Vector TypePLASMID
    GeneDAM
    Organism ScientificENTEROBACTERIA PHAGE T4
    Organism Taxid10665
    SynonymDEOXYADENOSYL-METHYLTRANSFERASE, M.ECOT4DAM

 Structural Features

(-) Chains, Units

  12345678
Asymmetric Unit ABDEFGHI
Biological Unit 1 (1x)A   F   
Biological Unit 2 (1x) B   G  
Biological Unit 3 (1x)  D   H 
Biological Unit 4 (1x)   E   I

Summary Information (see also Sequences/Alignments below)

(-) Ligands, Modified Residues, Ions  (1, 4)

Asymmetric Unit (1, 4)
No.NameCountTypeFull Name
1SFG4Ligand/IonSINEFUNGIN
Biological Unit 1 (1, 1)
No.NameCountTypeFull Name
1SFG1Ligand/IonSINEFUNGIN
Biological Unit 2 (1, 1)
No.NameCountTypeFull Name
1SFG1Ligand/IonSINEFUNGIN
Biological Unit 3 (1, 1)
No.NameCountTypeFull Name
1SFG1Ligand/IonSINEFUNGIN
Biological Unit 4 (1, 1)
No.NameCountTypeFull Name
1SFG1Ligand/IonSINEFUNGIN

(-) Sites  (4, 4)

Asymmetric Unit (4, 4)
No.NameEvidenceResiduesDescription
1AC1SOFTWARETYR A:7 , ASN A:10 , LYS A:11 , PHE A:32 , CYS A:33 , GLY A:34 , GLY A:35 , LEU A:36 , SER A:37 , ASP A:50 , ILE A:51 , GLN A:52 , LEU A:155 , HIS A:156 , PHE A:157 , ASP A:171 , PRO A:173 , TYR A:181 , PHE A:184 , DA G:616BINDING SITE FOR RESIDUE SFG A 300
2AC2SOFTWARETYR B:7 , ASN B:10 , LYS B:11 , PHE B:32 , CYS B:33 , GLY B:34 , GLY B:35 , LEU B:36 , SER B:37 , ASP B:50 , ILE B:51 , GLN B:52 , LEU B:155 , HIS B:156 , PHE B:157 , ASP B:171 , PRO B:173 , TYR B:181 , PHE B:184 , DA G:608BINDING SITE FOR RESIDUE SFG B 301
3AC3SOFTWARETYR D:7 , GLY D:9 , ASN D:10 , LYS D:11 , PHE D:32 , CYS D:33 , GLY D:34 , GLY D:35 , LEU D:36 , SER D:37 , ASP D:50 , ILE D:51 , GLN D:52 , PHE D:157 , ASP D:171 , PRO D:173 , TYR D:181 , PHE D:184 , DA I:616BINDING SITE FOR RESIDUE SFG D 302
4AC4SOFTWARETYR E:7 , ASN E:10 , LYS E:11 , PHE E:32 , CYS E:33 , GLY E:34 , GLY E:35 , LEU E:36 , SER E:37 , ASP E:50 , ILE E:51 , GLN E:52 , PHE E:157 , ASP E:171 , PRO E:173 , TYR E:181 , PHE E:184 , DA I:608BINDING SITE FOR RESIDUE SFG E 303

(-) SS Bonds  (0, 0)

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

(-) Cis Peptide Bonds  (4, 4)

Asymmetric Unit
No.Residues
1Gly A:44 -Pro A:45
2Gly B:44 -Pro B:45
3Gly D:44 -Pro D:45
4Gly E:44 -Pro E:45

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (0, 0)

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

(-) PROSITE Motifs  (1, 4)

Asymmetric Unit (1, 4)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1N6_MTASEPS00092 N-6 Adenine-specific DNA methylases signature.DMA_BPT4168-174
 
 
 
  4A:168-174
B:168-174
D:168-174
E:168-174
Biological Unit 1 (1, 1)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1N6_MTASEPS00092 N-6 Adenine-specific DNA methylases signature.DMA_BPT4168-174
 
 
 
  1A:168-174
-
-
-
Biological Unit 2 (1, 1)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1N6_MTASEPS00092 N-6 Adenine-specific DNA methylases signature.DMA_BPT4168-174
 
 
 
  1-
B:168-174
-
-
Biological Unit 3 (1, 1)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1N6_MTASEPS00092 N-6 Adenine-specific DNA methylases signature.DMA_BPT4168-174
 
 
 
  1-
-
D:168-174
-
Biological Unit 4 (1, 1)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1N6_MTASEPS00092 N-6 Adenine-specific DNA methylases signature.DMA_BPT4168-174
 
 
 
  1-
-
-
E:168-174

(-) Exons   (0, 0)

(no "Exon" information available for 1YFL)

(-) 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:246
 aligned with DMA_BPT4 | P04392 from UniProtKB/Swiss-Prot  Length:259

    Alignment length:259
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250         
             DMA_BPT4     1 MLGAIAYTGNKQSLLPELKSHFPKYNRFVDLFCGGLSVSLNVNGPVLANDIQEPIIEMYKRLINVSWDDVLKVIKQYKLSKTSKEEFLKLREDYNKTRDPLLLYVLHFHGFSNMIRINDKGNFTTPFGKRTINKNSEKQYNHFKQNCDKIIFSSLHFKDVKILDGDFVYVDPPYLITVADYNKFWSEDEEKDLLNLLDSLNDRGIKFGQSNVLEHHGKENTLLKEWSKKYNVKHLNKKYVFNIYHSKEKNGTDEVYIFN 259
               SCOP domains d1yfla1 A:1-259 DNA methylase T4DAM                                                                                                                                                                                                                                 SCOP domains
               CATH domains 1yflA01 A:1-51,A:147-259                           1yflA02 A:52-146 Adenine-specific Methyltransferase, Domain 2                                  1yflA01 A:1-51,A:147-259 Vaccinia Virus protein VP39                                                              CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author .............hhhhhhh.......eee.......hhhhh...eeee..hhhhhhhhhhhh..hhhhhhhhhhh......hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh..................hhhhhhhhhhhhhhh..eeee.............eeee........hhhhhhhhhhhhhhhhhhhhhhhhh...eeeeee.ee..eehhhhhhhh.........-------------....eeeee. Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -----------------------------------------------------------------------------------------------------------------------------------------------------------------------N6_MTAS------------------------------------------------------------------------------------- PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1yfl A   1 MLGAIAYTGNKQSLLPELKSHFPKYNRFVDLFCGGLSVSLNVNGPVLANDIQEPIIEMYKRLINVSWDDVLKVIKQYKLSKTSKEEFLKLREDYNKTRDPLLLYVLHFHGFSNMIRINDKGNFTTPFGKRTINKNSEKRFNHFKQNCDKIIFSSLHFKDVKILDGDFVYVDPPYLITVADYNKFWSEDEEKDLLNLLDSLNDRGIKFGLSNVLEHHGKENTLLKEWSKKYNVKHLN-------------NGTDEVYIFN 259
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230     |   -       250         
                                                                                                                                                                                                                                                                     236           250         

Chain B from PDB  Type:PROTEIN  Length:246
 aligned with DMA_BPT4 | P04392 from UniProtKB/Swiss-Prot  Length:259

    Alignment length:259
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250         
             DMA_BPT4     1 MLGAIAYTGNKQSLLPELKSHFPKYNRFVDLFCGGLSVSLNVNGPVLANDIQEPIIEMYKRLINVSWDDVLKVIKQYKLSKTSKEEFLKLREDYNKTRDPLLLYVLHFHGFSNMIRINDKGNFTTPFGKRTINKNSEKQYNHFKQNCDKIIFSSLHFKDVKILDGDFVYVDPPYLITVADYNKFWSEDEEKDLLNLLDSLNDRGIKFGQSNVLEHHGKENTLLKEWSKKYNVKHLNKKYVFNIYHSKEKNGTDEVYIFN 259
               SCOP domains d1yflb1 B:1-259 DNA methylase T4DAM                                                                                                                                                                                                                                 SCOP domains
               CATH domains 1yflB01 B:1-51,B:147-259                           1yflB02 B:52-146 Adenine-specific Methyltransferase, Domain 2                                  1yflB01 B:1-51,B:147-259 Vaccinia Virus protein VP39                                                              CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author .............hhhhhhh.......eee.......hhhhh...eeee..hhhhhhhhhhhh..hhhhhhhhhhh......hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh..................hhhhhhhhhhhhhhh..eeee..hhhhh......eeee........hhhhhhhhhhhhhhhhhhhhhhhhh...eeeeee.ee..eehhhhhhhh.........-------------....eeeee. Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -----------------------------------------------------------------------------------------------------------------------------------------------------------------------N6_MTAS------------------------------------------------------------------------------------- PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1yfl B   1 MLGAIAYTGNKQSLLPELKSHFPKYNRFVDLFCGGLSVSLNVNGPVLANDIQEPIIEMYKRLINVSWDDVLKVIKQYKLSKTSKEEFLKLREDYNKTRDPLLLYVLHFHGFSNMIRINDKGNFTTPFGKRTINKNSEKRFNHFKQNCDKIIFSSLHFKDVKILDGDFVYVDPPYLITVADYNKFWSEDEEKDLLNLLDSLNDRGIKFGLSNVLEHHGKENTLLKEWSKKYNVKHLN-------------NGTDEVYIFN 259
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230     |   -       250         
                                                                                                                                                                                                                                                                     236           250         

Chain D from PDB  Type:PROTEIN  Length:249
 aligned with DMA_BPT4 | P04392 from UniProtKB/Swiss-Prot  Length:259

    Alignment length:259
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250         
             DMA_BPT4     1 MLGAIAYTGNKQSLLPELKSHFPKYNRFVDLFCGGLSVSLNVNGPVLANDIQEPIIEMYKRLINVSWDDVLKVIKQYKLSKTSKEEFLKLREDYNKTRDPLLLYVLHFHGFSNMIRINDKGNFTTPFGKRTINKNSEKQYNHFKQNCDKIIFSSLHFKDVKILDGDFVYVDPPYLITVADYNKFWSEDEEKDLLNLLDSLNDRGIKFGQSNVLEHHGKENTLLKEWSKKYNVKHLNKKYVFNIYHSKEKNGTDEVYIFN 259
               SCOP domains d1yfld1 D:1-259 DNA methylase T4DAM                                                                                                                                                                                                                                 SCOP domains
               CATH domains 1yflD01 D:1-51,D:147-259                           1yflD02 D:52-146 Adenine-specific Methyltransferase, Domain 2                                  1yflD01 D:1-51,D:147-259 Vaccinia Virus protein VP39                                                              CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author .............hhhhhhh.......eee.......hhhhh...eee...hhhhhhhhhhhh..hhhhhhhhhhhh.....hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh....................hhhhhhhhhhhhhh.......hhhhh......eeee........hhhhhhhhhhhhhhhhhhhhhhhhh...eeeeeeeee..eehhhhhhhhhhheeee.....----------..eeeeeee. Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -----------------------------------------------------------------------------------------------------------------------------------------------------------------------N6_MTAS------------------------------------------------------------------------------------- PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1yfl D   1 MLGAIAYTGNKQSLLPELKSHFPKYNRFVDLFCGGLSVSLNVNGPVLANDIQEPIIEMYKRLINVSWDDVLKVIKQYKLSKTSKEEFLKLREDYNKTRDPLLLYVLHFHGFSNMIRINDKGNFTTPFGKRTINKNSEKRFNHFKQNCDKIIFSSLHFKDVKILDGDFVYVDPPYLITVADYNKFWSEDEEKDLLNLLDSLNDRGIKFGLSNVLEHHGKENTLLKEWSKKYNVKHLNKKY----------NGTDEVYIFN 259
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230        |-       250         
                                                                                                                                                                                                                                                                        239        250         

Chain E from PDB  Type:PROTEIN  Length:248
 aligned with DMA_BPT4 | P04392 from UniProtKB/Swiss-Prot  Length:259

    Alignment length:259
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250         
             DMA_BPT4     1 MLGAIAYTGNKQSLLPELKSHFPKYNRFVDLFCGGLSVSLNVNGPVLANDIQEPIIEMYKRLINVSWDDVLKVIKQYKLSKTSKEEFLKLREDYNKTRDPLLLYVLHFHGFSNMIRINDKGNFTTPFGKRTINKNSEKQYNHFKQNCDKIIFSSLHFKDVKILDGDFVYVDPPYLITVADYNKFWSEDEEKDLLNLLDSLNDRGIKFGQSNVLEHHGKENTLLKEWSKKYNVKHLNKKYVFNIYHSKEKNGTDEVYIFN 259
               SCOP domains d1yfle1 E:1-259 DNA methylase T4DAM                                                                                                                                                                                                                                 SCOP domains
               CATH domains 1yflE01 E:1-51,E:147-259                           1yflE02 E:52-146 Adenine-specific Methyltransferase, Domain 2                                  1yflE01 E:1-51,E:147-259 Vaccinia Virus protein VP39                                                              CATH domains
           Pfam domains (1) ------MethyltransfD12-1yflE01 E:7-238                                                                                                                                                                                                         --------------------- Pfam domains (1)
           Pfam domains (2) ------MethyltransfD12-1yflE02 E:7-238                                                                                                                                                                                                         --------------------- Pfam domains (2)
           Pfam domains (3) ------MethyltransfD12-1yflE03 E:7-238                                                                                                                                                                                                         --------------------- Pfam domains (3)
           Pfam domains (4) ------MethyltransfD12-1yflE04 E:7-238                                                                                                                                                                                                         --------------------- Pfam domains (4)
         Sec.struct. author .............hhhhhhh.......eee.......hhhhh...eee...hhhhhhhhhhhh..hhhhhhhhhhhh.....hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh....................hhhhhhhhhhhhhh.......hhhhh......eeee........hhhhhhhhhhhhhhhhhhhhhhhhh...eeeeeeeee..eehhhhhhhhhhheeee....-----------..eeeeeee. Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -----------------------------------------------------------------------------------------------------------------------------------------------------------------------N6_MTAS------------------------------------------------------------------------------------- PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1yfl E   1 MLGAIAYTGNKQSLLPELKSHFPKYNRFVDLFCGGLSVSLNVNGPVLANDIQEPIIEMYKRLINVSWDDVLKVIKQYKLSKTSKEEFLKLREDYNKTRDPLLLYVLHFHGFSNMIRINDKGNFTTPFGKRTINKNSEKRFNHFKQNCDKIIFSSLHFKDVKILDGDFVYVDPPYLITVADYNKFWSEDEEKDLLNLLDSLNDRGIKFGLSNVLEHHGKENTLLKEWSKKYNVKHLNKK-----------NGTDEVYIFN 259
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       | -       250         
                                                                                                                                                                                                                                                                       238         250         

Chain F from PDB  Type:DNA  Length:16
                                                
                 1yfl F 501 TCACAGGATCCTGTGA 516
                                   510      

Chain G from PDB  Type:DNA  Length:16
                                                
                 1yfl G 601 TCACAGGATCCTGTGA 616
                                   610      

Chain H from PDB  Type:DNA  Length:16
                                                
                 1yfl H 501 TCACAGGATCCTGTGA 516
                                   510      

Chain I from PDB  Type:DNA  Length:16
                                                
                 1yfl I 601 TCACAGGATCCTGTGA 616
                                   610      

   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, 4)

Asymmetric Unit

(-) CATH Domains  (2, 8)

Asymmetric Unit
(-)
Class: Alpha Beta (26913)
1a1yflD01D:1-51,D:147-259
1b1yflE01E:1-51,E:147-259
1c1yflA01A:1-51,A:147-259
1d1yflB01B:1-51,B:147-259

(-) Pfam Domains  (1, 4)

Asymmetric Unit

(-) Gene Ontology  (8, 8)

Asymmetric Unit(hide GO term definitions)
Chain A,B,D,E   (DMA_BPT4 | P04392)
molecular function
    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:0032775    DNA methylation on adenine    The covalent transfer of a methyl group to N-6 of adenine in a DNA molecule.
    GO:0006260    DNA replication    The cellular metabolic process in which a cell duplicates one or more molecules of DNA. DNA replication begins when specific sequences, known as origins of replication, are recognized and bound by initiation proteins, and ends when the original DNA molecule has been completely duplicated and the copies topologically separated. The unit of replication usually corresponds to the genome of the cell, an organelle, or a virus. The template for replication can either be an existing DNA molecule or RNA.
    GO:0032259    methylation    The process in which a methyl group is covalently attached to a molecule.
    GO:0016032    viral process    A multi-organism process in which a virus is a participant. The other participant is the host. Includes infection of a host cell, replication of the viral genome, and assembly of progeny virus particles. In some cases the viral genetic material may integrate into the host genome and only subsequently, under particular circumstances, 'complete' its life cycle.

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 Related Entries

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

UniProtKB/Swiss-Prot
        DMA_BPT4 | P043921q0s 1q0t 1yf3 1yfj

(-) Related Entries Specified in the PDB File

1q0s BINARY STRUCTURE OF T4DAM WITH ADOHCY
1q0t TERNARY STRUCTURE OF T4DAM WITH ADOHCY AND DNA
1yf3 T4DAM IN COMPLEX WITH ADOHCY AND 13-MER OLIGONUCLEOTIDE MAKING NON- AND SEMI-SPECIFIC (~1/4) CONTACT
1yfj T4DAM IN COMPLEX WITH ADOHCY AND 15-MER OLIGONUCLEOTIDE SHOWING SEMI-SPECIFIC AND SPECIFIC CONTACT