Collagenase - Q9X721 (Q9X721_HATHI)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for Q9X721: 13
 
Function
Clostridial collagenases are among the most efficient degraders of eukaryotic collagen known; saprophytes use collagen as a carbon source while pathogens additionally digest collagen to aid in host colonization. Has both tripeptidylcarboxypeptidase on Gly-X-Y and endopeptidase activities; the endopeptidase cuts within the triple helix region of collagen while tripeptidylcarboxypeptidase successively digests the exposed ends, thus clostridial collagenases can digest large sections of collagen (PubMed:3002446). Active on soluble type I collagen, insoluble collagen, azocoll, soluble PZ-peptide (all collagenase substrates) and gelatin (PubMed:9922257). The full-length protein has collagenase activity, while the in vivo derived C-terminally truncated shorter versions only act on gelatin (PubMed:9922257). In vitro digestion of soluble calf skin collagen fibrils requires both ColG and ColH; ColG forms missing the second collagen-binding domain are also synergistic with ColH, although their overall efficiency is decreased (PubMed:18374061, PubMed:22099748). The activator domain (residues 119-388) and catalytic subdomain (389-670) open and close around substrate using a Gly-rich hinge (387-397), allowing digestion when the protein is closed (PubMed:21947205, PubMed:23703618). Binding of collagen requires Ca(2+) and is inhibited by EGTA; the collagen-binding domain (CBD, S3a plus S3b) specifically recognizes the triple-helical conformation made by 3 collagen protein chains in the triple-helical region (PubMed:11121400). Isolated CBD (S3a plus S3b) binds collagen fibrils and sheets of many tissues (PubMed:11913772). UniProt
Catalytic Activity
Digestion of native collagen in the triple helical region at Xaa-|-Gly bonds. With synthetic peptides, a preference is shown for Gly at P3 and P1'; Pro and Ala at P2 and P2'; and hydroxyproline, Ala or Arg at P3'. UniProt
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Domain
The mature protein has 4 domains; a metalloprotease domain (S1, approximately residues 111-786), S2 (877-882, equivalent to PKD), and 2 collagen-binding domains (CBD) S3a (997-1003) and S3b (1008-1118) (PubMed:9922257, PubMed:11121400). The S1 domain has collagen hydrolytic activity (PubMed:11121400, PubMed:18937627). The metalloprotease S1 domain is composed of 3 subdomains which together resemble a saddle; an activator domain (residues 119-388), the catalytic peptidase subdomain (398-670) and a helper subdomain (679-790) joined by a Gly-rich hinge (387-397) (PubMed:21947205, PubMed:23703618). The S2 domain (799-880, PKD) is flexible within a larger structure (S1 plus S2, residues 119-880) (PubMed:21947205, PubMed:21871007). Binding to Ca(2+) renders the midsection of S2 more flexible; Ca(2+) binding confers thermostability (PubMed:25760606). S3a and S3b each have collagen-binding activity; collagen is bound more efficiently when both S3a and S3b are present (PubMed:11121400). CBD S3a plus S3b binds to many types of collagen in vitro and in vivo (PubMed:11913772). The structure of CBD S3b becomes more compact and thermostable when it is bound to Ca(2+) and its N-terminal linker (approximately residues 1008-1020) changes from an extended alpha-helix to a beta-sheet anchored to the rest of the CBD (PubMed:12682007, PubMed:23144249). S3b may act as a Ca(2+)-activated molecular switch to trigger domain reorientation (PubMed:12682007). Isolated CBD S3b binds unidirectionally to the C-terminus of the collagen triple helix via a surface cleft (PubMed:19208618, PubMed:23144249). The S3b domain binds preferentially to undertwisted segions of collagen (PubMed:22898990). UniProt
  • Organism: Clostridium histolyticum
  • Length:
  • UniProt
  • Other Gene names: colG
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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.
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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).
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