Inhibitor of TTK



  • TTK
  • Inhibitor
  • 1-10 uM

In Vitro Validations

Uniprot ID: P33981
Target Class: Protein kinase
Target SubClass: Ser/Thr Kinase
Potency: Ki
Potency Value: 27 nM
Potency Assay: Ambit KinomeScan In vitro kinase assay IC50 = 367 nM
PDB ID for probe-target interaction (3D structure): 3GFW
Target aliases:
Dual specificity protein kinase TTK, MPS1L1, MPS1, ...

DOI Reference: 10.1038/nchembio.345

In Cell Validations

In Vivo Data

No in Vivo Validations

Off-Target Selectivity Assesments

Potency end-point : Ki ALK 21 nM, ERK2 900 nM, PYK2 280 nM, FAK 440 nM, IGF1R 750 nM, INSR 470 nM, LTK 29 nM
Potency assay (off target): Ambit KinomeScan
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SERP ratings and comments

SERP Ratings

In Cell Rating

SERP Comments:

While MPS1-IN-1 is a relatively selective kinase inhibitor, it displays only moderate biochemical (~0.5 uM) and cellular (3-10 uM) potency. The original study does provide evidence of the engagement of MPS1 in cells using a wild-type vs M602Q-mutant cell system. Nonetheless, when used at the high concentrations (10 uM) in cells, interaction with additional (nonkinase) targets may occur. Additionally, no ADME, PK or in vivo data are available from the primary reference. Accordingly, MPS1-IN-1 should be used with caution in cellular assays (preferably in conjunction with additional MPS1 inhibitors based on alternative chemical scaffolds), and its use is not recommended for in vivo experiments. Multiple recent publications describe the identification and characterization of more advanced MPS1 inhibitors, likely better suited for interrogation of MPS1 function in cells and in vivo. For example, compound 27b from PMID 25625617 displays a biochemical IC50 of 2.7 nM and a cellular IC50 for pMPS1 of 0.7 nM. Its utility in vivo may be limited by toxicity at higher doses. Similarly, NMS-P715 (PMID 21723120), MPI-0479605 (PMID 22632936) and 34h (PMID 27055065) all provide good MPS1 potency and kinome selectivity while having been used in vivo.

(last updated: 5 May 2016 )

SERP Ratings

In Cell Rating
In Model Organisms

SERP Comments:

MPS1-IN-1 is only a moderately potent kinase inhibitor. In vitro IC50 = 350-650 nM for enzyme inhibition. Doses of 2-10 uM are required to inhibit MPS1-dependent activities in cells. The probe needs to be more potent and is only useful in cells at micromolar concentrations. Kinase inhibition profile and potency would need to determined on the kinases from the model organism for use in vivo. Additional controls are required to ensure that phenotypic activity is not due to off targets - examples include an inactive analog or another inhibitor from a different chemotype.

(last updated: 18 May 2016 )

SERP Ratings

In Cell Rating

SERP Comments:

MPS1-IN-1 shows cellular activity in the range of 1-10 µM. Ideally the potency would be well below micromolar, but the compound is still useful for interrogating cellular biology. However, given the tight binding of ATP to MPS1 (Km < 1 µM), further potency optimization may be challenging. I suggest that 10 µM is not exceeded. If possible, a minimal dose response experiment would be useful (e.g., 0.3, 1.0, 3.0, and 10 µM). There is no available pharmacokinetic data for this compound. The utility of MPS1-IN-1 to probe MPS1 function is enhanced by the availability of the dual MPS1/PLK1 inhibitor MPS1-IN-2. Both compounds are known to inhibit other kinases, and their concurrent usage will help to increase confidence in MPS1 as the molecular target if they phenocopy. 

(last updated: 1 Jul 2016 )