Crystal structure of the Hathewaya histolytica ColG tandem collagen-binding domain s3as3b in the presence of calcium at 1.9 Angstrom resolution

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.152 

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Ca2+-induced orientation of tandem collagen binding domains from clostridial collagenase ColG permits two opposing functions of collagen fibril formation and retardation.

Caviness, P.Bauer, R.Tanaka, K.Janowska, K.Roeser, J.R.Harter, D.Sanders, J.Ruth, C.Matsushita, O.Sakon, J.

(2018) FEBS J 285: 3254-3269

  • DOI: https://doi.org/10.1111/febs.14611
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    To penetrate host tissues, histotoxic clostridia secrete virulence factors including enzymes to hydrolyze extracellular matrix. Clostridium histolyticum, recently renamed as Hathewaya histolytica, produces two classes of collagenase (ColG and ColH). The high-speed AFM study showed that ColG collagenase moves unidirectionally to plane collagen fibril and rebundles fibril when stalled . The structural explanation of the roles for the tandem collagen-binding segment (CBDs) is illuminated by its calcium-bound crystal structure at 1.9 Å resolution (R work = 15.0%; R free = 19.6%). Activation may involve calcium-dependent domain rearrangement supported by both small-angle X-ray scattering and size exclusion chromatography. At pCa ≥ 5 (pCa = -log[Ca 2+ ]), the tandem CBD adopts an extended conformation that may facilitate secretion from the bacterium. At pCa ≤ 4, the compact structure seen in the crystal structure is adopted. This arrangement positions the two binding surfaces ~ 55 Å apart, and possibly ushers ColG along tropocollagen molecules that allow for unidirectional movement. A sequential binding mode where tighter binding CBD2 binds first could aid in processivity as well. Switch from processive collagenolysis to fibril rearrangement could be concentration dependent. Collagen fibril formation is retarded at 1 : 1 molar ratio of tandem CBD to collagen. Tandem CBD may help isolate a tropocollagen molecule from a fibril at this ratio. At 0.1 : 1 to 0.5 : 1 molar ratios fibril self-assembly was accelerated. Gain of function as a result of gene duplication of CBD for the M9B enzymes is speculated. The binding and activation modes described here will aid in drug delivery design.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Collagenase240Hathewaya histolyticaMutation(s): 0 
Gene Names: colG
Find proteins for Q9X721 (Hathewaya histolytica)
Explore Q9X721 
Go to UniProtKB:  Q9X721
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9X721
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.152 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.52α = 90
b = 54.71β = 90
c = 92.04γ = 90
Software Package:
Software NamePurpose
d*TREKdata scaling
PDB_EXTRACTdata extraction
d*TREKdata reduction

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States8P30GM103450

Revision History  (Full details and data files)

  • Version 1.0: 2017-03-15
    Type: Initial release
  • Version 1.1: 2017-09-20
    Changes: Author supporting evidence, Refinement description
  • Version 1.2: 2019-12-25
    Changes: Author supporting evidence
  • Version 1.3: 2020-02-19
    Changes: Database references, Source and taxonomy, Structure summary
  • Version 1.4: 2024-03-06
    Changes: Data collection, Database references