1FY1

[R23S,F25E]HBP, A MUTANT OF HUMAN HEPARIN BINDING PROTEIN (CAP37)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.294 
  • R-Value Work: 0.207 

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Ligand Structure Quality Assessment 


This is version 2.1 of the entry. See complete history


Literature

Two mutants of human heparin binding protein (CAP37): toward the understanding of the nature of lipid A/LPS and BPTI binding.

Kastrup, J.S.Linde, V.Pedersen, A.K.Stoffer, B.Iversen, L.F.Larsen, I.K.Rasmussen, P.B.Flodgaard, H.J.Bjorn, S.E.

(2001) Proteins 42: 442-451

  • DOI: https://doi.org/10.1002/1097-0134(20010301)42:4<442::aid-prot30>3.0.co;2-s
  • Primary Citation of Related Structures:  
    1FY1, 1FY3

  • PubMed Abstract: 

    Heparin binding protein (HBP) is an inactive serine protease homologue with important implications in host defense during infections and inflammations. Two mutants of human HBP, [R23S,F25E]HBP and [G175Q]HBP, have been produced to investigate structure-function relationships of residues in the putative lipid A/lipopolysaccharide (LPS) binding site and BPTI (bovine pancreatic trypsin inhibitor) binding site. The X-ray structures have been determined at 1.9 A resolution for [G175Q]HBP and at 2.5 A resolution for the [R23S,F25E]HBP mutant, and the structures have been fully refined to R-factors of 18.2 % and 20.7 %, respectively. The G175Q mutation does not alter the overall structure of the protein, but the ability to bind BPTI has been eliminated, and the mutant mediates only a limited stimulation of the LPS-induced cytokine release from human monocytes. The lipid A/LPS binding property of [G175Q]HBP is comparable with that of native HBP. The R23S,F25E mutations do not affect the binding of lipid A/LPS and BPTI or the LPS-induced cytokine release from human monocytes. This shows that two diverse ligands, lipid A/LPS and BPTI, do not share binding sites. Previously, there was convincing evidence for the proposed lipid A/LPS binding site of HBP. Unexpectedly, the extensive structural changes introduced by mutation of Arg23 and Phe25 do not affect the binding of lipid A/LPS, indicating that another not yet identified site on HBP is involved in the binding of lipid A/LPS.


  • Organizational Affiliation

    Department of Medicinal Chemistry, Royal Danish School of Pharmacy, Copenhagen, Denmark. kastrup@medchem.dfh.dk


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HEPARIN-BINDING PROTEIN225Homo sapiensMutation(s): 2 
UniProt & NIH Common Fund Data Resources
Find proteins for P20160 (Homo sapiens)
Explore P20160 
Go to UniProtKB:  P20160
PHAROS:  P20160
GTEx:  ENSG00000172232 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP20160
Glycosylation
Glycosylation Sites: 3Go to GlyGen: P20160-1
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
B
2N-Glycosylation
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.294 
  • R-Value Work: 0.207 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 38.72α = 90
b = 66.56β = 90
c = 102.99γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
TNTrefinement
TNTphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-09-28
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2021-11-03
    Changes: Database references, Structure summary