8VHD

Crystal Structure of Human IDH1 R132Q in complex with NADPH and Isocitrate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.38 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 

Starting Model: experimental
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Literature

Active site remodeling in tumor-relevant IDH1 mutants drives distinct kinetic features and potential resistance mechanisms.

Mealka, M.Sierra, N.A.Avellaneda Matteo, D.Albekioni, E.Khoury, R.Mai, T.Conley, B.M.Coleman, N.J.Sabo, K.A.Komives, E.A.Bobkov, A.A.Cooksy, A.L.Silletti, S.Schiffer, J.M.Huxford, T.Sohl, C.D.

(2024) Nat Commun 15: 3785-3785

  • DOI: https://doi.org/10.1038/s41467-024-48277-2
  • Primary Citation of Related Structures:  
    8VH9, 8VHA, 8VHB, 8VHC, 8VHD, 8VHE

  • PubMed Abstract: 

    Mutations in human isocitrate dehydrogenase 1 (IDH1) drive tumor formation in a variety of cancers by replacing its conventional activity with a neomorphic activity that generates an oncometabolite. Little is understood of the mechanistic differences among tumor-driving IDH1 mutants. We previously reported that the R132Q mutant unusually preserves conventional activity while catalyzing robust oncometabolite production, allowing an opportunity to compare these reaction mechanisms within a single active site. Here, we employ static and dynamic structural methods and observe that, compared to R132H, the R132Q active site adopts a conformation primed for catalysis with optimized substrate binding and hydride transfer to drive improved conventional and neomorphic activity over R132H. This active site remodeling reveals a possible mechanism of resistance to selective mutant IDH1 therapeutic inhibitors. This work enhances our understanding of fundamental IDH1 mechanisms while pinpointing regions for improving inhibitor selectivity.


  • Organizational Affiliation

    Department of Chemistry & Biochemistry, San Diego State University, San Diego, CA, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Isocitrate dehydrogenase [NADP] cytoplasmic
A, B, C, D
430Homo sapiensMutation(s): 1 
Gene Names: IDH1PICD
EC: 1.1.1.42
UniProt & NIH Common Fund Data Resources
Find proteins for O75874 (Homo sapiens)
Explore O75874 
Go to UniProtKB:  O75874
PHAROS:  O75874
GTEx:  ENSG00000138413 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO75874
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
NAP (Subject of Investigation/LOI)
Query on NAP

Download Ideal Coordinates CCD File 
E [auth A],
I [auth B],
N [auth C],
Q [auth D]
NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H28 N7 O17 P3
XJLXINKUBYWONI-NNYOXOHSSA-N
ICT (Subject of Investigation/LOI)
Query on ICT

Download Ideal Coordinates CCD File 
L [auth C]ISOCITRIC ACID
C6 H8 O7
ODBLHEXUDAPZAU-ZAFYKAAXSA-N
IOD
Query on IOD

Download Ideal Coordinates CCD File 
F [auth A],
J [auth B],
O [auth C],
T [auth D]
IODIDE ION
I
XMBWDFGMSWQBCA-UHFFFAOYSA-M
GOL
Query on GOL

Download Ideal Coordinates CCD File 
H [auth B],
M [auth C],
R [auth D],
S [auth D]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
CA
Query on CA

Download Ideal Coordinates CCD File 
G [auth A],
K [auth B],
P [auth C],
U [auth D]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.38 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84.408α = 90
b = 103.894β = 98.54
c = 108.272γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
American Cancer SocietyUnited StatesRSG-19-075-01-TBE
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesR35 GM137773

Revision History  (Full details and data files)

  • Version 1.0: 2024-04-24
    Type: Initial release
  • Version 1.1: 2024-05-22
    Changes: Database references