Biological Assembly 1  

 3D View: Structure

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 4-mer - A2B2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 128112.38 
• Atom Count: 8806 
• Residue Count: 1166 
• Unique protein chains: 2

1A4Y

RIBONUCLEASE INHIBITOR-ANGIOGENIN COMPLEX

• DOI: 10.2210/pdb1A4Y/pdb

• Classification: COMPLEX (INHIBITOR/NUCLEASE)
• Organism(s): Homo sapiens
• Expression System: Escherichia coli str. K-12 substr. W3110


• Deposited: 1998-02-08 Released: 1998-10-14 
• Deposition Author(s): Papageorgiou, A.C., Acharya, K.R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2 Å
• R-Value Free: 0.286 
• R-Value Work: 0.193 

Literature

Molecular recognition of human angiogenin by placental ribonuclease inhibitor--an X-ray crystallographic study at 2.0 A resolution.

Papageorgiou, A.C., Shapiro, R., Acharya, K.R.

(1997) EMBO J. 16: 5162-5177

• PubMed: 9311977 
• DOI: 10.1093/emboj/16.17.5162


• PubMed Abstract: 
  

Human placental RNase inhibitor (hRI), a leucine-rich repeat protein, binds the blood vessel-inducing protein human angiogenin (Ang) with extraordinary affinity (Ki <1 fM). Here we report a 2.0 A resolution crystal structure for the hRI-Ang complex that, together with extensive mutagenesis data from earlier studies, reveals the molecular features of this tight interaction. The hRI-Ang binding interface is large and encompasses 26 residues from hRI and 24 from Ang, recruited from multiple domains of both proteins. However, a substantial fraction of the energetically important contacts involve only a single region of each: the C-terminal segment 434-460 of hRI and the ribonucleolytic active centre of Ang, most notably the catalytic residue Lys40. Although the overall docking of Ang resembles that observed for RNase A in the crystal structure of its complex with the porcine RNase inhibitor, the vast majority of the interactions in the two complexes are distinctive, indicating that the broad specificity of the inhibitor for pancreatic RNase superfamily proteins is based largely on its capacity to recognize features unique to each of them. The implications of these findings for the development of small, hRI-based inhibitors of Ang for therapeutic use are discussed.

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Organizational Affiliation: 

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

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
RIBONUCLEASE INHIBITOR	A, D	460	Homo sapiens	Mutation(s): 0  Gene Names: RNH1 (PRI, RNH)
Find proteins for P13489 (Homo sapiens) Go to Gene View: RNH1 Go to UniProtKB:  P13489

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
ANGIOGENIN	B, E	123	Homo sapiens	Mutation(s): 0  Gene Names: ANG (RNASE5) EC: 3.1.27.-
Find proteins for P03950 (Homo sapiens) Go to Gene View: ANG Go to UniProtKB:  P03950

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2 Å
• R-Value Free: 0.286 
• R-Value Work: 0.193 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 66.553	α = 90.00
b = 105.605	β = 107.09
c = 93.516	γ = 90.00

Software Package:

Software Name	Purpose
X-PLOR	model building
SCALA	data scaling
DENZO	data reduction
X-PLOR	refinement
XDS	data scaling
CCP4	data scaling
XDS	data reduction
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-02-08 
• Released Date: 1998-10-14 
• Deposition Author(s): Papageorgiou, A.C., Acharya, K.R.

Revision History 

• Version 1.0: 1998-10-14
  Type: Initial release
• Version 1.1: 2008-03-24
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance