A high-affinity human PD-1/PD-L2 complex informs avenues for small-molecule immune checkpoint drug discovery
Abstract
Immune checkpoint blockade of programmed death-1 (PD-1) by monoclonal antibody drugs has delivered breakthroughs in the treatment of cancer. Nonetheless, small-molecule PD-1 inhibitors could lead to increases in treatment efficacy, safety, and global access. While the ligand-binding surface of apo-PD-1 is relatively flat, it harbors a striking pocket in the murine PD-1/PD-L2 structure. An analogous pocket in human PD-1 may serve as a small-molecule drug target, but the structure of the human complex is unknown. Because the CC' and FG loops in murine PD-1 adopt new conformations upon binding PD-L2, we hypothesized that mutations in these two loops could be coupled to pocket formation and alter PD-1’s affinity for PD-L2. Here, we conducted deep mutational scanning in these loops and used yeast surface display to select for enhanced PD-L2 binding. A PD-1 variant with three substitutions binds PD-L2 with an affinity two orders of magnitude higher than that of the wild-type protein, permitting crystallization of the complex. We determined the X-ray crystal structures of the human triple-mutant PD-1/PD-L2 complex and the apo triple-mutant PD-1 variant at 2.0 Å and 1.2 Å resolution, respectively. Binding of PD-L2 is accompanied by formation of a prominent pocket in human PD-1, as well asmore »
- Authors:
-
- Stanford Univ., CA (United States); Stanford Univ. School of Medicine, CA (United States)
- Stanford Univ., CA (United States); Stanford Univ. School of Medicine, CA (United States); Chan Zuckerberg Biohub, San Francisco, CA (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1594989
- Grant/Contract Number:
- AC02-76SF00515; DP1 DA043893; P41GM103393
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Proceedings of the National Academy of Sciences of the United States of America
- Additional Journal Information:
- Journal Volume: 116; Journal Issue: 49; Journal ID: ISSN 0027-8424
- Publisher:
- National Academy of Sciences
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; PD-1; PD-L2; immune checkpoint; drug discovery
Citation Formats
Tang, Shaogeng, and Kim, Peter S. A high-affinity human PD-1/PD-L2 complex informs avenues for small-molecule immune checkpoint drug discovery. United States: N. p., 2019.
Web. doi:10.1073/pnas.1916916116.
Tang, Shaogeng, & Kim, Peter S. A high-affinity human PD-1/PD-L2 complex informs avenues for small-molecule immune checkpoint drug discovery. United States. https://doi.org/10.1073/pnas.1916916116
Tang, Shaogeng, and Kim, Peter S. Thu .
"A high-affinity human PD-1/PD-L2 complex informs avenues for small-molecule immune checkpoint drug discovery". United States. https://doi.org/10.1073/pnas.1916916116. https://www.osti.gov/servlets/purl/1594989.
@article{osti_1594989,
title = {A high-affinity human PD-1/PD-L2 complex informs avenues for small-molecule immune checkpoint drug discovery},
author = {Tang, Shaogeng and Kim, Peter S.},
abstractNote = {Immune checkpoint blockade of programmed death-1 (PD-1) by monoclonal antibody drugs has delivered breakthroughs in the treatment of cancer. Nonetheless, small-molecule PD-1 inhibitors could lead to increases in treatment efficacy, safety, and global access. While the ligand-binding surface of apo-PD-1 is relatively flat, it harbors a striking pocket in the murine PD-1/PD-L2 structure. An analogous pocket in human PD-1 may serve as a small-molecule drug target, but the structure of the human complex is unknown. Because the CC' and FG loops in murine PD-1 adopt new conformations upon binding PD-L2, we hypothesized that mutations in these two loops could be coupled to pocket formation and alter PD-1’s affinity for PD-L2. Here, we conducted deep mutational scanning in these loops and used yeast surface display to select for enhanced PD-L2 binding. A PD-1 variant with three substitutions binds PD-L2 with an affinity two orders of magnitude higher than that of the wild-type protein, permitting crystallization of the complex. We determined the X-ray crystal structures of the human triple-mutant PD-1/PD-L2 complex and the apo triple-mutant PD-1 variant at 2.0 Å and 1.2 Å resolution, respectively. Binding of PD-L2 is accompanied by formation of a prominent pocket in human PD-1, as well as substantial conformational changes in the CC' and FG loops. The structure of the apo triple-mutant PD-1 shows that the CC' loop adopts the ligand-bound conformation, providing support for allostery between the loop and pocket. This human PD-1/PD-L2 structure provide critical insights for the design and discovery of small-molecule PD-1 inhibitors.},
doi = {10.1073/pnas.1916916116},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 49,
volume = 116,
place = {United States},
year = {2019},
month = {11}
}
Web of Science
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