Crystal structure of thermostable Carboxypeptidase (FisCP) from Fervidobacterium Islandicum AW-1

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.180 

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Biochemical and structural characterization of a keratin-degrading M32 carboxypeptidase from Fervidobacterium islandicum AW-1

Lee, Y.-J.Dhanasingh, I.Ahn, J.-S.Jin, H.-S.Choi, J.M.Lee, S.H.Lee, D.-W.

(2015) Biochem Biophys Res Commun 468: 927-933

  • DOI: https://doi.org/10.1016/j.bbrc.2015.11.058
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Comparative genomics of the keratin-degrading extremophilic eubacterium Fervidobacterium islandicum AW-1 and the closely related Fervidobacterium nodosum with no keratinolytic activity suggested that the FIAW1_1600 gene encoding a carboxypeptidase (CP) plays an important role in keratin degradation. The presumptive 489 amino acid sequence of the gene showed a conserved HEXXH motif with low levels of sequence identity (<38%) to reported thermostable M32 CPs. To identify its functional role, the FIAW1_1600 gene was overexpressed in Escherichia coli, and the recombinant enzyme was purified and characterized in detail. F. islandicum AW-1 CP (FisCP) formed a homodimer with a molecular mass of 107 kDa, and its apoenzyme exhibited maximal activity at 80 °C and pH 7.0 in the presence of Co(2+). This metalloenzyme mainly cleaved the C-termini of peptides with a basic amino acid sequence. The crystal structure of FisCP at 2.2 Å resolution showed high levels of structural similarities (root-mean-square deviations of <1.7 Å) to those of other M32 CP homologs. Remarkably, the enzyme significantly enhanced the degradation of native chicken feathers. This study suggests that FisCP, a keratinolytic member of the thermostable M32 CP family, plays an important role in keratin degradation for cellular metabolism in F. islandicum AW-1.

  • Organizational Affiliation

    School of Applied Biosciences, Kyungpook National University, Daegu 702-701, South Korea.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Thermostable carboxypeptidase 1489Fervidobacterium islandicumMutation(s): 0 
Find proteins for A0A140UHP3 (Fervidobacterium islandicum)
Explore A0A140UHP3 
Go to UniProtKB:  A0A140UHP3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A140UHP3
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on CO

Download Ideal Coordinates CCD File 
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.180 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 107.105α = 90
b = 56.757β = 90
c = 89.183γ = 90
Software Package:
Software NamePurpose
Cootmodel building
HKL-2000data processing
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-02-10
    Type: Initial release
  • Version 1.1: 2023-11-08
    Changes: Data collection, Database references, Derived calculations, Refinement description