Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

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

Macromolecule Content

• Total Structure Weight: 15.66 kDa 
• Atom Count: 1133 
• Modelled Residue Count: 121 
• Deposited Residue Count: 132 
• Unique protein chains: 2

1JMT

X-ray Structure of a Core U2AF65/U2AF35 Heterodimer

• PDB DOI: 10.2210/pdb1JMT/pdb

• Classification: RNA BINDING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21
• Mutation(s): Yes 


• Deposited: 2001-07-19 Released: 2001-09-19 
• Deposition Author(s): Kielkopf, C.L., Rodionova, N.A., Green, M.R., Burley, S.K.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.238 
• R-Value Work: 0.226 
• R-Value Observed: 0.226 

Literature

A novel peptide recognition mode revealed by the X-ray structure of a core U2AF35/U2AF65 heterodimer.

Kielkopf, C.L., Rodionova, N.A., Green, M.R., Burley, S.K.

(2001) Cell 106: 595-605

• PubMed: 11551507 
• DOI: 10.1016/s0092-8674(01)00480-9
• Primary Citation of Related Structures:  
  1JMT


• PubMed Abstract: 
  

U2 auxiliary factor (U2AF) is an essential splicing factor that recognizes the 3' splice site and recruits the U2 snRNP to the branch point. The X-ray structure of the human core U2AF heterodimer, consisting of the U2AF35 central domain and a proline-rich region of U2AF65, has been determined at 2.2 A resolution. The structure reveals a novel protein-protein recognition strategy, in which an atypical RNA recognition motif (RRM) of U2AF35 and the U2AF65 polyproline segment interact via reciprocal "tongue-in-groove" tryptophan residues. Complementary biochemical experiments demonstrate that the core U2AF heterodimer binds RNA, and that the interacting tryptophan side chains are essential for U2AF dimerization. Atypical RRMs in other splicing factors may serve as protein-protein interaction motifs elsewhere during spliceosome assembly.

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Organizational Affiliation: 

Laboratories of Molecular Biophysics, The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
SPLICING FACTOR U2AF 35 KDA SUBUNIT	A	104	Homo sapiens	Mutation(s): 1  Gene Names: U2AF1, U2AF35, U2AFBP, FP793
UniProt & NIH Common Fund Data Resources
Find proteins for Q01081 (Homo sapiens) Explore Q01081  Go to UniProtKB:  Q01081
PHAROS:  Q01081

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
SPLICING FACTOR U2AF 65 KDA SUBUNIT	B	28	Homo sapiens	Mutation(s): 0  Gene Names: U2AF2, U2AF65
UniProt & NIH Common Fund Data Resources
Find proteins for P26368 (Homo sapiens) Explore P26368  Go to UniProtKB:  P26368
PHAROS:  P26368

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HEZ	C [auth A], D [auth B]	HEXANE-1,6-DIOL C6 H14 O2 XXMIOPMDWAUFGU-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.238 
• R-Value Work: 0.226 
• R-Value Observed: 0.226 
• Space Group: P 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 41.52	α = 90
b = 49.74	β = 90
c = 92.16	γ = 90

Software Package:

Software Name	Purpose
SOLVE	phasing
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2001-07-19 
• Released Date: 2001-09-19 
Deposition Author(s): Kielkopf, C.L., Rodionova, N.A., Green, M.R., Burley, S.K.

Revision History  

• Version 1.0: 2001-09-19
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2021-02-03
  Changes: Database references, Derived calculations, Structure summary
• Version 1.4: 2021-10-27
  Changes: Database references