1I4W

THE CRYSTAL STRUCTURE OF THE TRANSCRIPTION FACTOR SC-MTTFB OFFERS INTRIGUING INSIGHTS INTO MITOCHONDRIAL TRANSCRIPTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.187 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structure of the transcription factor sc-mtTFB offers insights into mitochondrial transcription.

Schubot, F.D.Chen, C.J.Rose, J.P.Dailey, T.A.Dailey, H.A.Wang, B.C.

(2001) Protein Sci 10: 1980-1988

  • DOI: 10.1110/ps.11201
  • Primary Citation of Related Structures:  
    1I4W

  • PubMed Abstract: 
  • Although it is commonly accepted that binding of mitochondrial transcription factor sc-mtTFB to the mitochondrial RNA polymerase is required for specific transcription initiation in Saccharomyces cerevisiae, its precise role has remained undefined. In the present work, the crystal structure of sc-mtTFB has been determined to 2 ...

    Although it is commonly accepted that binding of mitochondrial transcription factor sc-mtTFB to the mitochondrial RNA polymerase is required for specific transcription initiation in Saccharomyces cerevisiae, its precise role has remained undefined. In the present work, the crystal structure of sc-mtTFB has been determined to 2.6 A resolution. The protein consists of two domains, an N-terminal alpha/beta-domain and a smaller domain made up of four alpha-helices. Contrary to previous predictions, sc-mtTFB does not resemble Escherichia coli sigma-factors but rather is structurally homologous to rRNA methyltransferase ErmC'. This suggests that sc-mtTFB functions as an RNA-binding protein, an observation standing in contradiction to the existing model, which proposed a direct interaction of sc-mtTFB with the mitochondrial DNA promoter. Based on the structure, we propose that the promoter specificity region is located on the mitochondrial RNA polymerase and that binding of sc-mtTFB indirectly mediates interaction of the core enzyme with the promoter site.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia 30602, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MITOCHONDRIAL REPLICATION PROTEIN MTF1A353Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: MTF1
EC: 2.1.1
Find proteins for P14908 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P14908 
Go to UniProtKB:  P14908
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
XE
Query on XE

Download Ideal Coordinates CCD File 
B [auth A], C [auth A], D [auth A]XENON
Xe
FHNFHKCVQCLJFQ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.187 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.418α = 90
b = 44.684β = 110.23
c = 99.819γ = 90
Software Package:
Software NamePurpose
ISIRphasing
CNSrefinement
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-10-03
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance