7SIU

Crystal structure of HPK1 (MAP4K1) complex with inhibitor A-745

Summary for 7SIU

• Entry DOI: 10.2210/pdb7siu/pdb
• Descriptor: Mitogen-activated protein kinase kinase kinase kinase 1, 6-[(5R)-5-benzamidocyclohex-1-en-1-yl]-3-[(1-methyl-1H-pyrazol-4-yl)amino]pyrazine-2-carboxamide, SULFATE ION, ... (4 entities in total)
• Functional Keywords: protein kinase, signaling protein, transferase
• Biological source: Homo sapiens (Human)
• Total number of polymer chains: 2
• Total formula weight: 70318.95

Authors

Longenecker, K.L.,Korepanova, A.,Qiu, W. (deposition date: 2021-10-14, release date: 2022-03-02, Last modification date: 2023-10-18)

Primary citation

Malchow, S.,Korepanova, A.,Panchal, S.C.,McClure, R.A.,Longenecker, K.L.,Qiu, W.,Zhao, H.,Cheng, M.,Guo, J.,Klinge, K.L.,Trusk, P.,Pratt, S.D.,Li, T.,Kurnick, M.D.,Duan, L.,Shoemaker, A.R.,Gopalakrishnan, S.M.,Warder, S.E.,Shotwell, J.B.,Lai, A.,Sun, C.,Osuma, A.T.,Pappano, W.N.
The HPK1 Inhibitor A-745 Verifies the Potential of Modulating T Cell Kinase Signaling for Immunotherapy.
Acs Chem.Biol., 17:556-566, 2022

PubMed Abstract: Hematopoietic progenitor kinase 1 (HPK1) is an MAP4K family member within the Ste20-like serine/threonine branch of the kinome. HPK1 expression is limited to hematopoietic cells and has a predominant role as a negative regulator of T cell function. Because of the central/dominant role in negatively regulating T cell function, HPK1 has long been in the center of interest as a potential pharmacological target for immune therapy. The development of a small molecule HPK1 inhibitor remains challenging because of the need for high specificity relative to other kinases, including additional MAP4K family members, that are required for efficient immune cell activation. Here, we report the identification of the selective and potent HPK1 chemical probe, A-745. In unbiased cellular kinase-binding assays, A-745 demonstrates an excellent cellular selectivity binding profile within pharmacologically relevant concentrations. This HPK1 selectivity translates to an immune cell activation phenotype reminiscent of Hpk1-deficient and Hpk1-kinase-dead T cells, including augmented proliferation and cytokine production. The results from this work give a path forward for further developmental efforts to generate additional selective and potent small molecule HPK1 inhibitors with the pharmacological properties for immunotherapy.

PubMed: 35188729
DOI: 10.1021/acschembio.1c00819

Experimental method

X-RAY DIFFRACTION (1.786 Å)