Crystal structure of human PHGDH complexed with Compound 1

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 

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Inhibition of 3-phosphoglycerate dehydrogenase (PHGDH) by indole amides abrogates de novo serine synthesis in cancer cells.

Mullarky, E.Xu, J.Robin, A.D.Huggins, D.J.Jennings, A.Noguchi, N.Olland, A.Lakshminarasimhan, D.Miller, M.Tomita, D.Michino, M.Su, T.Zhang, G.Stamford, A.W.Meinke, P.T.Kargman, S.Cantley, L.C.

(2019) Bioorg Med Chem Lett 29: 2503-2510

  • DOI: https://doi.org/10.1016/j.bmcl.2019.07.011
  • Primary Citation of Related Structures:  
    6PLF, 6PLG

  • PubMed Abstract: 

    Cancer cells reprogram their metabolism to support growth and to mitigate cellular stressors. The serine synthesis pathway has been identified as a metabolic pathway frequently altered in cancers and there has been considerable interest in developing pharmacological agents to target this pathway. Here, we report a series of indole amides that inhibit human 3-phosphoglycerate dehydrogenase (PHGDH), the enzyme that catalyzes the first committed step of the serine synthesis pathway. Using X-ray crystallography, we show that the indole amides bind the NAD + pocket of PHGDH. Through structure-based optimization we were able to develop compounds with low nanomolar affinities for PHGDH in an enzymatic IC 50 assay. In cellular assays, the most potent compounds inhibited de novo serine synthesis with low micromolar to sub-micromolar activities and these compounds successfully abrogated the proliferation of cancer cells in serine free media. The indole amide series reported here represent an important improvement over previously published PHGDH inhibitors as they are markedly more potent and their mechanism of action is better defined.

  • Organizational Affiliation

    Proteomics and Metabolomics Core Facility, Weill Cornell Medicine, New York, NY 10021, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
D-3-phosphoglycerate dehydrogenase
A, B
314Homo sapiensMutation(s): 0 
Gene Names: PHGDHPGDH3
EC: (PDB Primary Data), (PDB Primary Data), (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for O43175 (Homo sapiens)
Explore O43175 
Go to UniProtKB:  O43175
GTEx:  ENSG00000092621 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO43175
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.202α = 90
b = 126.192β = 99.76
c = 59.504γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-07-24
    Type: Initial release
  • Version 1.1: 2019-08-07
    Changes: Data collection, Database references
  • Version 1.2: 2019-09-04
    Changes: Data collection, Database references