Table of contents

Change of the comment line (CC) topic INTERACTION

Not before: 01-Oct-2008

The CC line topic INTERACTION conveys information about binary protein-protein interactions. A description of its current format is available in the UniProtKB User Manual. Up to now, all interaction data has been automatically derived from the IntAct database. In the future we will start to add manually curated binary protein-protein interactions in UniProtKB/Swiss-Prot (these are currently described in the CC line topic SUBUNIT). In order to represent isoform- and chain-specific interactions (e.g. for viral polyproteins), and to add interactor-specific comments (e.g. PTMs and binding regions), we are going to modify the format of the INTERACTION lines. Each binary interaction will be represented by a block of 3 to 4 lines:

• The first line of a block indicates the experimental evidence for the interaction and the data source (literature reference or By similarity and/or cross-reference to the database from which the data was derived).
• The next line is an optional comment about the interaction.
• The last two lines give details on the interacting proteins: the Protein1= line represents the currently displayed entry, the Protein2= line the other interacting protein. If Protein2 is from a different species than Protein1, its species or taxonomic range is indicated.

Note: Variable values are represented in italics. Perl-style multipliers indicate whether a pattern (as delimited by parentheses) is optional (?), may occur 0 or more times (*), or 1 or more times (+). Alternative values are separated by a pipe symbol (|). Special characters are escaped by a backslash (\).

 CC   -!- INTERACTION:
(CC       Interact=status( \(source|By similarity\))?;( Xref=xref;)?
(CC         Comment=free_text;)?
 CC         Protein1=name [id(:subid)?];( Note=free_text;)?
 CC         Protein2=name [id(:subid)?];( Organism=organism;)?( Note=free_text;)?)+

• status = Yes | No | Uncertain
  Displays the experimental evidence for the interaction:
  • Yes if there is experimental evidence that the two proteins (or their homologues) interact in a physiological context.
  • No if there is experimental evidence that the two proteins (or their homologues) do not interact under the experimental conditions described in the cited publication.
  • Uncertain if the experimental evidence for the interaction between the two proteins (or their homologues) is not considered to reliably reflect an interaction in a physiological context (e.g. results from not further validated yeast-two-hybrid or in-vitro experiments).
• db_xref = db:db_id(, db:db_id)*
  List of database cross-references, each consisting of database name and unique database identifier.
• source: A db_xref with db = PubMed
  Literature sources for the interaction.
• xref: A db_xref with db = IntAct
  Database entries from which the interaction was imported (currently only IntAct).
• name: Biologically meaningful label or name for the protein.
  Displays the gene name (as shown in the GN line field Name= or OrderedLocusNames= or ORFNames=) or a dash '-' if the gene name is unknown.
  If the protein contains multiple chains (e.g. a viral polyprotein), the chain name (from the FT line) is displayed instead and the identifier which follows in square brackets must contain the FTId of the chain.
• id: UniProt accession number or isoform identifier (IsoId= field).
• subid: UniProt feature identifier (FTId= field).
• organism: Indicates that the interacting proteins originate from different species. The value of this field is one of the following:
  • tax_name [NCBI_TaxID:tax_id]: Scientific name and NCBI taxonomy database identifier of (group of) species of Protein2. In a host-virus protein interaction this refers to the range of species of Protein2. An entry from a representative virus strain/isolate is displayed in Protein2.
  • Host: In a virus-host protein interaction this refers to the range of species of Protein2 which corresponds to the OH line of Protein1. An entry from a representative host is displayed in Protein2.
• free_text: Free text.
  • Comment= contains additional information concerning the interaction (like subcellular location).
  • Note= contains additional information concerning the interacting protein (like PTM status, binding domains).

Examples:

CC   -!- INTERACTION:
CC       Interact=Yes (PubMed:11533489);
CC         Comment=HDAC3 mediates the deacetylation of RELA.
CC         Protein1=RELA [Q04206];
CC         Protein2=HDAC3 [O15379];

CC   -!- INTERACTION:
CC       Interact=Yes (PubMed:10837489);
CC         Protein1=MCL1 [Q07820-1];
CC         Protein2=BAK1 [Q16611];
CC       Interact=Yes (PubMed:15901672, 17097560); Xref=IntAct:EBI-1003422,EBI-519866;
CC         Protein1=MCL1 [Q07820];
CC         Protein2=BAK1 [Q16611];

CC   -!- INTERACTION:
CC       Interact=Yes (PubMed:11418237); Xref=IntAct:EBI-375446,EBI-389883;
CC         Protein1=ABI1 [Q8IZP0];
CC         Protein2=NCK1 [P16333]; Note=SH3 1 domain;
CC       Interact=No (PubMed:12681507);
CC         Protein1=ABI1 [Q8IZP0-6];
CC         Protein2=NCK1 [P16333];
CC       Interact=Yes (By similarity);
CC         Protein1=ABI1 [Q8IZP0]; Note=N-terminus;
CC         Protein2=WASF1 [Q92558];

CC   -!- INTERACTION:
CC       Interact=Yes (By similarity);
CC         Protein1=C1QR1 [Q9NPY3];
CC         Protein2=Core protein p21 [P27955:PRO_0000037583)]; Organism=Hepatitis C virus [NCBI_TaxID=11103]; Note=See also other virus strains;

CC   -!- INTERACTION:
CC       Interact=Yes (By similarity);
CC         Protein1=Core protein p21 [P27955:PRO_0000037583];
CC         Protein2=C1QR1 [Q9NPY3]; Organism=Host; Note=See also other hosts;

CC   -!- INTERACTION:
CC       Interact=Yes (PubMed:16470652); Xref=IntAct:EBI-907934,EBI-907894;
CC         Protein1=CNP [P06623];
CC         Protein2=CABP1 [Q9NZU7]; Organism=Homo sapiens [NCBI_TaxID=9606];

CC   -!- INTERACTION:
CC       Interact=Uncertain (PubMed:15231747);
CC          Protein1=NOB1 [Q9ULX3];
CC          Protein2=UPF2 [Q9HAU5];