Macromolecule Content

• Total Structure Weight: 18162.03 
• Atom Count: 1186 
• Residue Count: 142 
• Unique protein chains: 1
• Unique nucleic acid chains: 1

1K1G

STRUCTURAL BASIS FOR RECOGNITION OF THE INTRON BRANCH SITE RNA BY SPLICING FACTOR 1

• DOI: 10.2210/pdb1K1G/pdb
• NDB: 1K1G

• Classification: GENE REGULATION/RNA
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 2001-09-25 Released: 2001-11-07 
• Deposition Author(s): Liu, Z., Luyten, I., Bottomley, M.J., Messias, A.C., Houngninou-Molango, S., Sprangers, R., Zanier, K., Kramer, A., Sattler, M.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 10 
• Selection Criteria: 10 lowest energy structures consistent with experimental distance and dihedral angle restraints 

Literature

Structural basis for recognition of the intron branch site RNA by splicing factor 1.

Liu, Z., Luyten, I., Bottomley, M.J., Messias, A.C., Houngninou-Molango, S., Sprangers, R., Zanier, K., Kramer, A., Sattler, M.

(2001) Science 294: 1098-1102

• PubMed: 11691992 
• DOI: 10.1126/science.1064719


• PubMed Abstract: 
  

During spliceosome assembly, splicing factor 1 (SF1) specifically recognizes the intron branch point sequence (BPS) UACUAAC in the pre-mRNA transcripts. We show that the KH-QUA2 region of SF1 defines an enlarged KH (hn RNP K) fold which is necessary and sufficient for BPS binding. The 3' part of the BPS (UAAC), including the conserved branch point adenosine (underlined), is specifically recognized in a hydrophobic cleft formed by the Gly-Pro-Arg-Gly motif and the variable loop of the KH domain. The QUA2 region recognizes the 5' nucleotides of the BPS (ACU). The branch point adenosine acting as the nucleophile in the first biochemical step of splicing is deeply buried. BPS RNA recognition suggests how SF1 may facilitate subsequent formation of the prespliceosomal complex A.

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Organizational Affiliation: 

European Molecular Biology Laboratory (EMBL), Meyerhofstrasse 1, D-69117 Heidelberg, Germany.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
SF1-Bo isoform	A	131	Homo sapiens	Mutation(s): 0  Gene Names: SF1 (ZFM1, ZNF162)
Find proteins for Q15637 (Homo sapiens) Go to Gene View: SF1 Go to UniProtKB:  Q15637

Entity ID: 1
Molecule	Chains	Length	Organism
5'-R(*UP*AP*UP*AP*CP*UP*AP*AP*CP*AP*A)-3'	B	11	N/A

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 10 
• Selection Criteria: 10 lowest energy structures consistent with experimental distance and dihedral angle restraints 
• Olderado: 1K1G Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2001-09-25 
• Released Date: 2001-11-07 
• Deposition Author(s): Liu, Z., Luyten, I., Bottomley, M.J., Messias, A.C., Houngninou-Molango, S., Sprangers, R., Zanier, K., Kramer, A., Sattler, M.

Revision History 

• Version 1.0: 2001-11-07
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance