5U03

Cryo-EM structure of the human CTP synthase filament


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.10 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

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:  
    5TKV, 5U03, 5U05, 5U3C, 5U6R

  • 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 catalytic activity ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CTP synthase 1A, B, C, D591Homo sapiensMutation(s): 0 
Gene Names: CTPS1CTPS
EC: 6.3.4.2
UniProt & NIH Common Fund Data Resources
Find proteins for P17812 (Homo sapiens)
Explore P17812 
Go to UniProtKB:  P17812
PHAROS:  P17812
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.10 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

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