5U05

Cryo-EM structure of the E. coli CTP synthase tetramer


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 7.9 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Human CTP synthase filament structure reveals the active enzyme conformation.

Lynch, E.M.Hicks, D.R.Shepherd, M.Endrizzi, J.A.Maker, A.Hansen, J.M.Barry, R.M.Gitai, Z.Baldwin, E.P.Kollman, J.M.

(2017) Nat. Struct. Mol. Biol. 24: 507-514

  • DOI: 10.1038/nsmb.3407
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The universally conserved enzyme CTP synthase (CTPS) forms filaments in bacteria and eukaryotes. In bacteria, polymerization inhibits CTPS activity and is required for nucleotide homeostasis. Here we show that for human CTPS, polymerization increases ...

    The universally conserved enzyme CTP synthase (CTPS) forms filaments in bacteria and eukaryotes. In bacteria, polymerization inhibits CTPS activity and is required for nucleotide homeostasis. Here we show that for human CTPS, polymerization increases catalytic activity. The cryo-EM structures of bacterial and human CTPS filaments differ considerably in overall architecture and in the conformation of the CTPS protomer, explaining the divergent consequences of polymerization on activity. The structure of human CTPS filament, the first structure of the full-length human enzyme, reveals a novel active conformation. The filament structures elucidate allosteric mechanisms of assembly and regulation that rely on a conserved conformational equilibrium. The findings may provide a mechanism for increasing human CTPS activity in response to metabolic state and challenge the assumption that metabolic filaments are generally storage forms of inactive enzymes. Allosteric regulation of CTPS polymerization by ligands likely represents a fundamental mechanism underlying assembly of other metabolic filaments.


    Organizational Affiliation

    Department of Biochemistry, University of Washington, Seattle, Washington, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CTP synthase
A, B, C, D
545Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: pyrG
EC: 6.3.4.2
Find proteins for P0A7E5 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A7E5
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 7.9 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-04-26
    Type: Initial release
  • Version 1.1: 2017-05-17
    Type: Database references
  • Version 1.2: 2017-06-21
    Type: Database references
  • Version 1.3: 2018-07-18
    Type: Data collection