5Z6M

High-pressure Crystal Structure Analysis of M20 loop closed DHFR at 800 MPa


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.306 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.236 

wwPDB Validation 3D Report Full Report



Literature

High-pressure protein crystal structure analysis of Escherichia coli dihydrofolate reductase complexed with folate and NADP.

Nagae, T.Yamada, H.Watanabe, N.

(2018) Acta Crystallogr D Struct Biol 74: 895-905

  • DOI: 10.1107/S2059798318009397
  • Primary Citation of Related Structures:  
    4X5I, 4X5J, 4X5F, 4X5G, 4X5H, 5Z6J, 5Z6L, 5Z6K, 5Z6M, 5Z6F

  • PubMed Abstract: 
  • A high-pressure crystallographic study was conducted on Escherichia coli dihydrofolate reductase (ecDHFR) complexed with folate and NADP + in crystal forms containing both the open and closed conformations of the M20 loop under high-press ...

    A high-pressure crystallographic study was conducted on Escherichia coli dihydrofolate reductase (ecDHFR) complexed with folate and NADP + in crystal forms containing both the open and closed conformations of the M20 loop under high-pressure conditions of up to 800 MPa. At pressures between 270 and 500 MPa the crystal form containing the open conformation exhibited a phase transition from P2 1 to C2. Several structural changes in ecDHFR were observed at high pressure that were also accompanied by structural changes in the NADP + cofactor and the hydration structure. In the crystal form with the closed conformation the M20 loop moved as the pressure changed, with accompanying conformational changes around the active site, including NADP + and folate. These movements were consistent with the suggested hypothesis that movement of the M20 loop was necessary for ecDHFR to catalyze the reaction. In the crystal form with the open conformation the nicotinamide ring of the NADP + cofactor undergoes a large flip as an intermediate step in the reaction, despite being in a crystalline state. Furthermore, observation of the water molecules between Arg57 and folate elucidated an early step in the substrate-binding pathway. These results demonstrate the possibility of using high-pressure protein crystallography as a method to capture high-energy substates or transient structures related to the protein reaction cycle.


    Organizational Affiliation

    Synchrotron Radiation Research Center, Nagoya University, Chikusa, Nagoya 464-8603, Japan.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Dihydrofolate reductaseA162Escherichia coli K-12Mutation(s): 0 
Gene Names: folAtmrAb0048JW0047
EC: 1.5.1.3
Find proteins for P0ABQ4 (Escherichia coli (strain K12))
Explore P0ABQ4 
Go to UniProtKB:  P0ABQ4
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAP
Query on NAP

Download CCD File 
A
NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H28 N7 O17 P3
XJLXINKUBYWONI-NNYOXOHSSA-N
 Ligand Interaction
FOL
Query on FOL

Download CCD File 
A
FOLIC ACID
C19 H19 N7 O6
OVBPIULPVIDEAO-LBPRGKRZSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
CME
Query on CME
AL-PEPTIDE LINKINGC5 H11 N O3 S2CYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.306 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.236 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 33.915α = 90
b = 41.849β = 90
c = 97.525γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
JSPS KAKENHIJapan21657027
JSPS KAKENHIJapan24657071

Revision History 

  • Version 1.0: 2018-09-19
    Type: Initial release