Properdin - P27918 (PROP_HUMAN)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

A positive regulator of the alternate pathway (AP) of complement (PubMed:20382442, PubMed:28264884). It binds to and stabilizes the C3- and C5-convertase enzyme complexes (PubMed:20382442, PubMed:28264884). Inhibits CFI-CFH mediated degradation of Complement C3 beta chain (C3b) (PubMed:31507604). UniProt
Pathway Maps
      ESCHER  BiGG
Subunit Structure
In plasma, properdin exists as dimers, trimers or tetramers in the relative proportions of 26:54:20 (PubMed:20382442, PubMed:15491616, PubMed:28264884, PubMed:31507604). Interacts with the pro-C3-convertase enzyme complex (C3b-Bb) comprised of Complement C3 beta chain (C3b) and the Complement factor B Bb fragment (Bb), where it binds (via its TSP type-1 5 domain) with C3b and Bb (PubMed:28264884, PubMed:31507604). This interaction stabilizes the complex and allows it to become the active C3-convertase enzyme complex (C3b-Bb-FP) (PubMed:28264884, PubMed:31507604). Interacts with C3b (PubMed:28264884, PubMed:31507604). Interacts with CFB (PubMed:31507604). UniProt
TSP type-1 domain 0 binds to TSP type-1 domain 4, and TSP type-1 domain 1 binds to TSP type-1 domain 6 (PubMed:15491616, PubMed:28264884, PubMed:31507604). These interactions mediate multimerization (PubMed:15491616, PubMed:28264884, PubMed:31507604). UniProt
The Protein Feature View requires a browser that supports SVG (Scalable Vector Graphics). Mouse over tracks and labels for more information.
Data origin/color codes
The vertical color bar on the left side indicates data provenance.
Data in green originates from UniProtKB  
Variation data (sourced from UniProt) shows non-genetic variation from the ExPASy   and dbSNP   websites.
Data in yellow originates from Pfam  , by interacting with the HMMER3 web site  
Data in purple originates from Phosphosite  .
Data in orange originates from the SCOP   (version 1.75) and SCOPe   (version 2.04) classifications.
Data in grey has been calculated using BioJava  . Protein disorder predictions are based on JRONN (Troshin, P. and Barton, G. J. unpublished), a Java implementation of RONN  
  • Red: potentially disorderd region
  • Blue: probably ordered region.
Hydropathy has been calculated using a sliding window of 15 residues and summing up scores from standard hydrophobicity tables.
  • Red: hydrophobic
  • Blue: hydrophilic.
Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
Sequence Mismatches It is now possible to see information about expression tags, cloning artifacts, and many other details related to sequence mismatches.
Icons represent a number of different sequence modifications that can be observed in PDB files. For example the 'T' icon T represents expression tags that have been added to the sequence. The 'E' icon E represents an engineered mutation. However, besides these two, there are many other icons. For more information about the meaning and exact position of a sequence modification, move the cursor over the icon.
Validation Track

For more details on the Validation Track (Structure Summary Page only) see the dedicated help page.

Data in red indicates combined ranges of Homology Models from the SWISS-MODEL Repository  
The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
Organism icons generated by under CC BY. The authors are: Freepik, Icons8, OCHA, Scott de Jonge.

For more details on the Protein Feature view see the dedicated help page.