Biological Assembly 1  

 3D View: Structure

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 37.29 kDa 
• Atom Count: 2560 
• Modelled Residue Count: 246 
• Deposited Residue Count: 246 
• Unique protein chains: 1
• Unique nucleic acid chains: 1

1DZ5

The NMR structure of the 38KDa U1A protein-PIE RNA complex reveals the basis of cooperativity in regulation of polyadenylation by human U1A protein

• DOI: 10.2210/pdb1DZ5/pdb
• NDB: 1DZ5

• Classification: RIBONUCLEOPROTEIN/RNA
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2000-02-16 Released: 2000-03-29 
• Deposition Author(s): Varani, L., Gunderson, S.I., Mattaj, I.W., Kay, L.E., Neuhaus, D., Varani, G.

---

Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 13 
• Selection Criteria: AGREEMENT WITH EXPERIMENTAL DATA 

Literature

The NMR Structure of the 38kDa U1A Protein-Pie RNA Complex Reveals the Basis of Cooperativity in Regulation of Polyadenylation by Human U1A Protein

Varani, L., Gunderson, S.I., Mattaj, I.W., Kay, L.E., Neuhaus, D., Varani, G.

(2000) Nat Struct Biol 7: 329

• PubMed: 10742179 
• DOI: 10.1038/74101
• Primary Citation of Related Structures:  
  1DZ5


• PubMed Abstract: 
  

The status of the poly(A) tail at the 3'-end of mRNAs controls the expression of numerous genes in response to developmental and extracellular signals. Poly(A) tail regulation requires cooperative binding of two human U1A proteins to an RNA regulatory region called the polyadenylation inhibition element (PIE). When bound to PIE RNA, U1A proteins also bind to the enzyme responsible for formation of the mature 3'-end of most eukaryotic mRNAs, poly(A) polymerase (PAP). The NMR structure of the 38 kDa complex formed between two U1A molecules and PIE RNA shows that binding cooperativity depends on helix C located at the end of the RNA-binding domain and just adjacent to the PAP-interacting domain of U1A. Since helix C undergoes a conformational change upon RNA binding, the structure shows that binding cooperativity and interactions with PAP occur only when U1A is bound to its cognate RNA. This mechanism ensures that the activity of PAP enzyme, which is essential to the cell, is only down regulated when U1A is bound to the U1A mRNA.

---

Organizational Affiliation: 

MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, UK.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
U1 SMALL NUCLEAR RIBONUCLEOPROTEIN A	A, B	101	Homo sapiens	Mutation(s): 2  Gene Names: SNRPA
UniProt & NIH Common Fund Data Resources
Find proteins for P09012 (Homo sapiens) Explore P09012  Go to UniProtKB:  P09012
PHAROS:  P09012 GTEx:  ENSG00000077312

Entity ID: 2
Molecule	Chains	Length	Organism	Image
PIE, RNA (5'-R(*GP*AP*GP*AP*CP*AP*UP*UP*GP*CP*AP*CP*CP* CP*GP*GP*AP*GP*UP*CP*UP*C)-3')	C, D	22	Homo sapiens

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 13 
• Selection Criteria: AGREEMENT WITH EXPERIMENTAL DATA 
• OLDERADO: 1DZ5 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-02-16 
• Released Date: 2000-03-29 
Deposition Author(s): Varani, L., Gunderson, S.I., Mattaj, I.W., Kay, L.E., Neuhaus, D., Varani, G.

Revision History  

• Version 1.0: 2000-03-29
  Type: Initial release
  
• Version 1.1: 2013-05-15
  Changes: Atomic model, Database references, Derived calculations, Other, Source and taxonomy, Structure summary, Version format compliance