3RTX

Crystal structure of mammalian capping enzyme (Mce1) and Pol II CTD complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.81 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.224 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural insights to how mammalian capping enzyme reads the CTD code.

Ghosh, A.Shuman, S.Lima, C.D.

(2011) Mol.Cell 43: 299-310

  • DOI: 10.1016/j.molcel.2011.06.001

  • PubMed Abstract: 
  • Physical interaction between the phosphorylated RNA polymerase II carboxyl-terminal domain (CTD) and cellular capping enzymes is required for efficient formation of the 5' mRNA cap, the first modification of nascent mRNA. Here, we report the crystal ...

    Physical interaction between the phosphorylated RNA polymerase II carboxyl-terminal domain (CTD) and cellular capping enzymes is required for efficient formation of the 5' mRNA cap, the first modification of nascent mRNA. Here, we report the crystal structure of the RNA guanylyltransferase component of mammalian capping enzyme (Mce) bound to a CTD phosphopeptide. The CTD adopts an extended β-like conformation that docks Tyr1 and Ser5-PO(4) onto the Mce nucleotidyltransferase domain. Structure-guided mutational analysis verified that the Mce-CTD interface is a tunable determinant of CTD binding and stimulation of guanylyltransferase activity, and of Mce function in vivo. The location and composition of the CTD binding site on mammalian capping enzyme is distinct from that of a yeast capping enzyme that recognizes the same CTD primary structure. Thus, capping enzymes from different taxa have evolved different strategies to read the CTD code.


    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
A, B
343Mus musculusMutation(s): 0 
Gene Names: Rngtt (Cap1a)
Find proteins for O55236 (Mus musculus)
Go to UniProtKB:  O55236
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
RNA Polymerase II C-terminal domain
C
18N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GUN
Query on GUN

Download SDF File 
Download CCD File 
A, B
GUANINE
C5 H5 N5 O
UYTPUPDQBNUYGX-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
C
L-PEPTIDE LINKINGC3 H8 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.81 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.224 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 82.980α = 90.00
b = 114.750β = 90.00
c = 150.220γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
ADSCdata collection
HKL-2000data scaling
PHASERphasing
PDB_EXTRACTdata extraction
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2011-05-04 
  • Released Date: 2011-06-29 
  • Deposition Author(s): Ghosh, A., Lima, C.D.

Revision History 

  • Version 1.0: 2011-06-29
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2011-11-30
    Type: Database references