Biological Assembly 1  

 3D View: Structure

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 12.54 kDa 
• Atom Count: 873 
• Residue Count: 111 
• Unique protein chains: 1
• Unique nucleic acid chains: 1

4B8T

RNA BINDING PROTEIN Solution structure of the third KH domain of KSRP in complex with the G-rich target sequence.

• DOI: 10.2210/pdb4B8T/pdb
• NDB: 4B8T
• BMRB: 18702

• Classification: TRANSCRIPTION/RNA
• Organism(s): Homo sapiens, synthetic construct
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2012-08-30 Released: 2012-11-07 
• Deposition Author(s): Nicastro, G., Garcia-Mayoral, M.F., Hollingworth, D., Kelly, G., Martin, S.R., Briata, P., Gherzi, R., Ramos, A.

---

Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

Noncanonical G Recognition Mediates Ksrp Regulation of Let-7 Biogenesis

Nicastro, G., Garcia-Mayoral, M.F., Hollingworth, D., Kelly, G., Martin, S.R., Briata, P., Gherzi, R., Ramos, A.

(2012) Nat Struct Mol Biol 19: 1282

• PubMed: 23142982 
• DOI: 10.1038/nsmb.2427
• Primary Citation of Related Structures:  
  4B8T


• PubMed Abstract: 
  

Let-7 is an important tumor-suppressive microRNA (miRNA) that acts as an on-off switch for cellular differentiation and regulates the expression of a set of human oncogenes. Binding of the human KSRP protein to let-7 miRNA precursors positively regulates their processing to mature let-7, thereby contributing to control of cell proliferation, apoptosis and differentiation. Here we analyze the molecular basis for KSRP-let-7 precursor selectivity and show how the third KH domain of the protein recognizes a G-rich sequence in the pre-let-7 terminal loop and dominates the interaction. The structure of the KH3-RNA complex explains the protein recognition of this noncanonical KH target sequence, and we demonstrate that the specificity of this binding is crucial for the functional interaction between the protein and the miRNA precursor.

---

Related Citations: 

• The Structure of the C-Terminal Kh Domains of Ksrp Reveals a Noncanonical Motif Important for Mrna Degradation.
  Garcia-Mayoral, M.F., Hollingworth, D., Masino, L., Diaz-Moreno, I., Kelly, G., Gherzi, R., Chou, C., Chen, C., Ramos, A.
  (2007) Structure 15: 485

---

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
KH-TYPE SPLICING REGULATORY PROTEIN	A	106	Homo sapiens	Mutation(s): 0  Gene Names: KHSRP, FUBP2
Find proteins for Q92945 (Homo sapiens) Explore Q92945  Go to UniProtKB:  Q92945
NIH Common Fund Data Resources
PHAROS  Q92945 GTEx  ENSG00000088247

Entity ID: 2
Molecule	Chains	Length	Organism	Image
5'-R(*AP*GP*GP*GP*UP)-3'	B	5	synthetic construct

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 4B8T Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2012-08-30 
• Released Date: 2012-11-07 
Deposition Author(s): Nicastro, G., Garcia-Mayoral, M.F., Hollingworth, D., Kelly, G., Martin, S.R., Briata, P., Gherzi, R., Ramos, A.

Revision History 

• Version 1.0: 2012-11-07
  Type: Initial release
  
• Version 1.1: 2012-11-21
  Changes: Database references
• Version 1.2: 2012-11-28
  Changes: Other, Structure summary
• Version 1.3: 2012-12-05
  Changes: Atomic model
• Version 1.4: 2013-01-16
  Changes: Database references