3KYH

Saccharomyces cerevisiae Cet1-Ceg1 capping apparatus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.249 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of the Saccharomyces cerevisiae Cet1-Ceg1 mRNA Capping Apparatus.

Gu, M.Rajashankar, K.R.Lima, C.D.

(2010) Structure 18: 216-227

  • DOI: 10.1016/j.str.2009.12.009

  • PubMed Abstract: 
  • The 5' guanine-N7 cap is the first cotranscriptional modification of messenger RNA. In Saccharomyces cerevisiae, the first two steps in capping are catalyzed by the RNA triphosphatase Cet1 and RNA guanylyltransferase Ceg1, which form a complex that i ...

    The 5' guanine-N7 cap is the first cotranscriptional modification of messenger RNA. In Saccharomyces cerevisiae, the first two steps in capping are catalyzed by the RNA triphosphatase Cet1 and RNA guanylyltransferase Ceg1, which form a complex that is directly recruited to phosphorylated RNA polymerase II (RNAP IIo), primarily via contacts between RNAP IIo and Ceg1. A 3.0 A crystal structure of Cet1-Ceg1 revealed a 176 kDa heterotetrameric complex composed of one Cet1 homodimer that associates with two Ceg1 molecules via interactions between the Ceg1 oligonucleotide binding domain and an extended Cet1 WAQKW amino acid motif. The WAQKW motif is followed by a flexible linker that would allow Ceg1 to achieve conformational changes required for capping while maintaining interactions with both Cet1 and RNAP IIo. The impact of mutations as assessed through genetic analysis in S. cerevisiae is consonant with contacts observed in the Cet1-Ceg1 structure.


    Organizational Affiliation

    Structural Biology Program, Sloan-Kettering Institute, New York, NY 10065, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
mRNA-capping enzyme subunit beta
A, B
310Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Gene Names: CET1
EC: 3.1.3.33
Find proteins for O13297 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  O13297
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
mRNA-capping enzyme subunit alpha
C, D
461Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Gene Names: CEG1
EC: 2.7.7.50
Find proteins for Q01159 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  Q01159
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.249 
  • Space Group: P 63
Unit Cell:
Length (Å)Angle (°)
a = 165.993α = 90.00
b = 165.993β = 90.00
c = 172.355γ = 120.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
SHARPphasing
SCALEPACKdata scaling
DENZOdata reduction
SOLOMONphasing
MAR345dtbdata collection
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2009-12-06 
  • Released Date: 2010-02-16 
  • Deposition Author(s): Lima, C.D.

Revision History 

  • Version 1.0: 2010-02-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2017-10-25
    Type: Author supporting evidence, Refinement description