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Title: Pfam  
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Description The Pfam database provides alignments and hidden Markov models for protein domains.
Data types captured Protein families
Organisms all
Research center EBI
Primary citation PMID 19920124
Data format Stockholm format
Website Pfam
Download URL Pfam ftp Pfam ftp
License GNU Lesser General Public License
Bookmarkable entities yes

Pfam is a database of protein families that includes their annotations and multiple sequence alignments generated using hidden Markov models.[1][2][3]


  • Features 1
  • See also 2
  • References 3
  • External links 4


For each family in Pfam one can:

  • Look at multiple alignments
  • View protein domain architectures
  • Examine species distribution
  • Follow links to other databases
  • View known protein structures

The descriptions of Pfam families are managed by the general public using WorldHeritage.

Nearly 80% of protein sequences in the UniProt Knowledgebase have at least one match to Pfam.[4] This number is called the sequence coverage.

The Pfam database contains information about protein domains and families. Pfam-A is the manually curated portion of the database that contains over 16,000 entries. For each entry a protein sequence alignment and a hidden Markov model is stored. These hidden Markov models can be used to search sequence databases with the HMMER package written by Sean Eddy.

Because the entries in Pfam-A do not cover all known proteins, an automatically generated supplement is provided called Pfam-B. Pfam-B contains a large number of small families derived from clusters produced by an algorithm called ADDA.[5] Although of lower quality, Pfam-B families can be useful when no Pfam-A families are found. Pfam-B was discontinued on release 28.0.[6]

The database iPfam[7] builds on the domain description of Pfam. It investigates if different proteins described together in the protein structure database PDB are close enough to potentially interact.

The current release of Pfam is "Pfam 28.0" (May 2015; 16,230 families).[8]

See also

  • TrEMBL Database performing an automated protein sequence annotation
  • InterPro Integration of protein domain and protein family databases
  • PDBfam — thorough assignment of Pfam domains to sequences in the Protein Data Bank (PDB)[9][10]


  1. ^ Finn RD, Tate J, Mistry J, Coggill PC, Sammut SJ, Hotz HR, Ceric G, Forslund K, Eddy SR, Sonnhammer EL, Bateman A (2008). "The Pfam protein families database". Nucleic Acids Res 36 (Database issue): D281–8.  
  2. ^ Finn, R. D.; Mistry, J.; Schuster-Böckler, B.; Griffiths-Jones, S.; Hollich, V.; Lassmann, T.; Moxon, S.; Marshall, M.; Khanna, A.; Durbin, R.; Eddy, S. R.; Sonnhammer, E. L.; Bateman, A. (Jan 2006). "Pfam: clans, web tools and services" (Free full text). Nucleic Acids Research 34 (Database issue): D247–D251.  
  3. ^  
  4. ^ Punta, M.; Coggill, P. C.; Eberhardt, R. Y.; Mistry, J.; Tate, J.; Boursnell, C.; Pang, N.; Forslund, K.; Ceric, G. (2011). "The Pfam protein families database". Nucleic Acids Research 40 (D1): D290–D301.  
  5. ^ Heger, A.; Wilton, C. A.; Sivakumar, A.; Holm, L. (Jan 2005). "ADDA: a domain database with global coverage of the protein universe" (Free full text). Nucleic Acids Research 33 (Database issue): D188–D191.  
  6. ^ "Pfam 28.0 release notes". Retrieved 30 June 2015. 
  7. ^ Finn, R. D.; Marshall, M.; Bateman, A. (Feb 2005). "IPfam: visualization of protein-protein interactions in PDB at domain and amino acid resolutions" (Free full text). Bioinformatics (Oxford, England) 21 (3): 410–412.  
  8. ^ "Pfam current release notes". Retrieved 30 June 2015. 
  9. ^ Dunbrack, Roland. "PDBfam". PDBfam. Fox Chase Cancer Center. Retrieved 9 March 2013. 
  10. ^ Xu, Qifang; Dunbrack, Roland (2012). "Assignment of protein sequences to existing domain and family classification systems: Pfam and the PDB". Bioinformatics 28 (21): 2763–72.  

External links

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