Biological Assembly 1  

 3D View: Structure

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 25.08 kDa 
• Atom Count: 1759 
• Residue Count: 230 
• Unique protein chains: 2

2KXH

Solution structure of the first two RRM domains of FIR in the complex with FBP Nbox peptide

• DOI: 10.2210/pdb2KXH/pdb

• Classification: PROTEIN BINDING
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2010-05-05 Released: 2010-08-18 
• Deposition Author(s): Cukier, C.D., Ramos, A., Hollingworth, D., Diaz-Moreno, I., Kelly, G.

---

Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

Molecular basis of FIR-mediated c-myc transcriptional control.

Cukier, C.D., Hollingworth, D., Martin, S.R., Kelly, G., Diaz-Moreno, I., Ramos, A.

(2010) Nat Struct Mol Biol 17: 1058-1064

• PubMed: 20711187 
• DOI: 10.1038/nsmb.1883
• Primary Citation of Related Structures:  
  2KXF, 2KXH


• PubMed Abstract: 
  

The far upstream element (FUSE) regulatory system promotes a peak in the concentration of c-Myc during cell cycle. First, the FBP transcriptional activator binds to the FUSE DNA element upstream of the c-myc promoter. Then, FBP recruits its specific repressor (FIR), which acts as an on/off transcriptional switch. Here we describe the molecular basis of FIR recruitment, showing that the tandem RNA recognition motifs of FIR provide a platform for independent FUSE DNA and FBP protein binding and explaining the structural basis of the reversibility of the FBP-FIR interaction. We also show that the physical coupling between FBP and FIR is modulated by a flexible linker positioned sequentially to the recruiting element. Our data explain how the FUSE system precisely regulates c-myc transcription and suggest that a small change in FBP-FIR affinity leads to a substantial effect on c-Myc concentration.

---

Organizational Affiliation: 

Molecular Structure Division, Medical Research Council National Institute for Medical Research, London, UK.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Poly(U)-binding-splicing factor PUF60	A	199	Homo sapiens	Mutation(s): 0  Gene Names: PUF60, FIR, ROBPI, SIAHBP1
Find proteins for Q9UHX1 (Homo sapiens) Explore Q9UHX1  Go to UniProtKB:  Q9UHX1
NIH Common Fund Data Resources
PHAROS:  Q9UHX1 GTEx:  ENSG00000179950

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
peptide of Far upstream element-binding protein 1	B	31	Homo sapiens	Mutation(s): 0  Gene Names: FUBP1
Find proteins for Q96AE4 (Homo sapiens) Explore Q96AE4  Go to UniProtKB:  Q96AE4
NIH Common Fund Data Resources
PHAROS:  Q96AE4 GTEx:  ENSG00000162613

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 2KXH Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-05-05 
• Released Date: 2010-08-18 
Deposition Author(s): Cukier, C.D., Ramos, A., Hollingworth, D., Diaz-Moreno, I., Kelly, G.

Revision History 

• Version 1.0: 2010-08-18
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2019-12-18
  Changes: Data collection, Database references