IPI - International Protein Index - InterPro Hits Format

InterPro is is an integrated documentation resource for protein families, domains and sites. InterPro combines a number of databases (referred to as member databases) that use different methodologies and a varying degree of biological information on well-characterised proteins to derive protein signatures. Each release of IPI is scanned for InterPro hits. The ipi.<OS_code>.IPC.gz file is a tab-delineated text file, with the following fields:

Column	Description
Source_database	The database from which the master entry for this IPI entry is derived (e.g. SP (UniProtKB/Swiss-Prot), TR (UniProtKB/TrEMBL), ENSEMBL, TAIR, HINV, VEGA, REFSEQ)
Identifier_of_protein_in_parent_database	The master entry's own ID
IPI_ID
Interpro_entry_AC	Each InterPro entry comprises one or many methods that are judged to be equivalent by InterPro curators.
Method_AC	Method ID of the InterPro method that has hit this protein. Methods are derived from the InterPro member databases e.g PFam, ProSite, etc.
Start_postion	N-terminal extent of the signature of this method in this protein
Stop_postition	C-terminal extent of the signature of this method in this protein

For more information on InterPro see the InterPro home page.