1UN3

CRYSTAL STRUCTURE OF HUMAN ANGIOGENIN VARIANT T44D


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.200 

wwPDB Validation   3D Report Full Report


This is version 2.1 of the entry. See complete history


Literature

Crystallographic Studies on Structural Features that Determine the Enzymatic Specificity and Potency of Human Angiogenin: Thr44, Thr80 and Residues 38-41

Holloway, D.E.Chavali, G.B.Hares, M.C.Baker, M.D.Subbarao, G.V.Shapiro, R.Acharya, K.R.

(2004) Biochemistry 43: 1230

  • DOI: https://doi.org/10.1021/bi035654+
  • Primary Citation of Related Structures:  
    1UN3, 1UN4, 1UN5

  • PubMed Abstract: 

    Human angiogenin (Ang) is a potent inducer of blood vessel formation and is a member of the pancreatic ribonuclease superfamily. Its enzymatic activity is unusually weak and biased toward cleavage after cytidine nucleotides. As part of an ongoing investigation into the structural basis of Ang's characteristic activity, we have determined the crystal structures of three Ang variants having novel activity. (i) The structure of T44D-Ang indicates that Asp44 can participate directly in pyrimidine binding and that the intrinsic hydrogen-bonding capability of this residue largely governs the pyrimidine specificity of this variant. Unexpectedly, the mutation also causes the most extensive disruption of the C-terminus seen in any Ang variant thus far. This allows the side chain of Arg101 to penetrate the B(1) site, raising the possibility that it participates in substrate binding as occurs in ribonuclease 4. (ii) The structure of T80A-Ang supports the view that Thr80 plays little role in maintaining the obstructive conformation of the C-terminus and that its participation in a hydrogen bond with Thr44 selectively weakens the interaction between Thr44 and N3 of cytosine. (iii) ARH-II is an angiogenin/RNase A chimera in which residues 38-41 of Ang are replaced with the corresponding residues (38-42) of RNase A. Its structure suggests that the guest segment influences catalysis by subtle means, possibly by reducing the pK(a) of the catalytic lysine. The loss of angiogenic activity is not attributable to disruption of known cell-binding or nuclear translocation sites but may be a consequence of the chimera's enhanced ribonucleolytic activity.


  • Organizational Affiliation

    Department of Biology and Biochemistry, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ANGIOGENIN123Homo sapiensMutation(s): 1 
EC: 3.1.27.5
UniProt & NIH Common Fund Data Resources
Find proteins for P03950 (Homo sapiens)
Explore P03950 
Go to UniProtKB:  P03950
PHAROS:  P03950
GTEx:  ENSG00000214274 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP03950
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
PCA
Query on PCA
A
L-PEPTIDE LINKINGC5 H7 N O3GLN
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.200 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.398α = 90
b = 41.533β = 90
c = 33.761γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-02-06
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2020-03-11
    Changes: Polymer sequence
  • Version 2.1: 2023-12-13
    Changes: Data collection, Database references, Refinement description