X-ray structure of the proprotein convertase furin bound with the competitive inhibitor 4-aminomethyl-phenylacetyl-Arg-Val-Arg-Amba

Experimental Data Snapshot

  • Resolution: 1.99 Å
  • R-Value Free: 0.184 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.163 

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X-ray Structures of the Proprotein Convertase Furin Bound with Substrate Analogue Inhibitors Reveal Substrate Specificity Determinants beyond the S4 Pocket.

Dahms, S.O.Hardes, K.Steinmetzer, T.Than, M.E.

(2018) Biochemistry 57: 925-934

  • DOI: https://doi.org/10.1021/acs.biochem.7b01124
  • Primary Citation of Related Structures:  
    6EQV, 6EQW, 6EQX

  • PubMed Abstract: 

    The proprotein convertase furin is a highly specific serine protease modifying and thereby activating proteins in the secretory pathway by proteolytic cleavage. Its substrates are involved in many diseases, including cancer and infections caused by bacteria and viruses. Understanding furin's substrate specificity is crucially important for the development of pharmacologically applicable inhibitors. Using protein X-ray crystallography, we investigated the extended substrate binding site of furin in complex with three peptide-derived inhibitors at up to 1.9 Å resolution. The structure of the protease bound with a hexapeptide inhibitor revealed molecular details of its S6 pocket, which remained completely unknown so far. The arginine residue at P6 induced an unexpected turnlike conformation of the inhibitor backbone, which is stabilized by intra- and intermolecular H-bonds. In addition, we confirmed the binding of arginine to the previously proposed S5 pocket (S5 1 ). An alternative S5 site (S5 2 ) could be utilized by shorter side chains as demonstrated for a 4-aminomethyl-phenylacetyl residue, which shows steric properties similar to those of a lysine side chain. Interestingly, we also observed binding of a peptide with citrulline at P4 substituting for the highly conserved arginine. The structural data might indicate an unusual protonation state of Asp264 maintaining the interaction with uncharged citrulline. The herein identified molecular interaction sites at P5 and P6 can be utilized to improve next-generation furin inhibitors. Our data will also help to predict furin substrates more precisely on the basis of the additional specificity determinants observed for P5 and P6.

  • Organizational Affiliation

    Department of Molecular Biology, University of Salzburg , Billrothstrasse 11, A-5020 Salzburg, Austria.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Furin482Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P09958 (Homo sapiens)
Explore P09958 
Go to UniProtKB:  P09958
PHAROS:  P09958
GTEx:  ENSG00000140564 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP09958
Sequence Annotations
  • Reference Sequence

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
AMA-ARG-TBG-ARG-00SB [auth D]5synthetic constructMutation(s): 0 
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on TBG
Experimental Data & Validation

Experimental Data

  • Resolution: 1.99 Å
  • R-Value Free: 0.184 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.163 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 131.713α = 90
b = 131.713β = 90
c = 155.393γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-02-28
    Type: Initial release
  • Version 1.1: 2024-01-17
    Changes: Advisory, Data collection, Database references, Derived calculations, Refinement description