5DOT

Crystal Structure of Human Carbamoyl phosphate synthetase I (CPS1), apo form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.165 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structure of human carbamoyl phosphate synthetase: deciphering the on/off switch of human ureagenesis.

de Cima, S.Polo, L.M.Diez-Fernandez, C.Martinez, A.I.Cervera, J.Fita, I.Rubio, V.

(2015) Sci Rep 5: 16950-16950

  • DOI: 10.1038/srep16950
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Human carbamoyl phosphate synthetase (CPS1), a 1500-residue multidomain enzyme, catalyzes the first step of ammonia detoxification to urea requiring N-acetyl-L-glutamate (NAG) as essential activator to prevent ammonia/amino acids depletion. Here we p ...

    Human carbamoyl phosphate synthetase (CPS1), a 1500-residue multidomain enzyme, catalyzes the first step of ammonia detoxification to urea requiring N-acetyl-L-glutamate (NAG) as essential activator to prevent ammonia/amino acids depletion. Here we present the crystal structures of CPS1 in the absence and in the presence of NAG, clarifying the on/off-switching of the urea cycle by NAG. By binding at the C-terminal domain of CPS1, NAG triggers long-range conformational changes affecting the two distant phosphorylation domains. These changes, concerted with the binding of nucleotides, result in a dramatic remodeling that stabilizes the catalytically competent conformation and the building of the ~35 Å-long tunnel that allows migration of the carbamate intermediate from its site of formation to the second phosphorylation site, where carbamoyl phosphate is produced. These structures allow rationalizing the effects of mutations found in patients with CPS1 deficiency (presenting hyperammonemia, mental retardation and even death), as exemplified here for some mutations.


    Organizational Affiliation

    Instituto de Biomedicina de Valencia del Consejo Superior de Investigaciones Científicas (IBV-CSIC), Jaime Roig 11, 46010 Valencia, Spain.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Carbamoyl-phosphate synthase [ammonia], mitochondrial
A, B
1489Homo sapiensMutation(s): 0 
Gene Names: CPS1
EC: 6.3.4.16
Find proteins for P31327 (Homo sapiens)
Go to Gene View: CPS1
Go to UniProtKB:  P31327
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download SDF File 
Download CCD File 
A, B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
EDO
Query on EDO

Download SDF File 
Download CCD File 
A, B
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
NI
Query on NI

Download SDF File 
Download CCD File 
A, B
NICKEL (II) ION
Ni
VEQPNABPJHWNSG-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.165 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 99.337α = 90.00
b = 133.482β = 102.51
c = 142.907γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
PHASERphasing
XSCALEdata reduction
PDB_EXTRACTdata extraction
SCALAdata scaling
REFMACrefinement
XSCALEdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Fundacion Alicia KoplowitzSpainNo grant number
Valencian GovernmentSpainPrometeo 2009/051
Spanish GovernmentSpainBFU2011-30407

Revision History 

  • Version 1.0: 2015-12-09
    Type: Initial release