1
|
Azzam T, Du JJ, Flowers MW, Ali AV, Hunn JC, Vijayvargiya N, Knagaram R, Bogacz M, Maravillas KE, Sastre DE, Fields JK, Mirzaei A, Pierce BG, Sundberg EJ. Combinatorially restricted computational design of protein-protein interfaces to produce IgG heterodimers. Sci Adv 2024; 10:eadk8157. [PMID: 38598628 PMCID: PMC11006224 DOI: 10.1126/sciadv.adk8157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Accepted: 03/08/2024] [Indexed: 04/12/2024]
Abstract
Redesigning protein-protein interfaces is an important tool for developing therapeutic strategies. Interfaces can be redesigned by in silico screening, which allows for efficient sampling of a large protein space before experimental validation. However, computational costs limit the number of combinations that can be reasonably sampled. Here, we present combinatorial tyrosine (Y)/serine (S) selection (combYSelect), a computational approach combining in silico determination of the change in binding free energy (ΔΔG) of an interface with a highly restricted library composed of just two amino acids, tyrosine and serine. We used combYSelect to design two immunoglobulin G (IgG) heterodimers-combYSelect1 (L368S/D399Y-K409S/T411Y) and combYSelect2 (D399Y/K447S-K409S/T411Y)-that exhibit near-optimal heterodimerization, without affecting IgG stability or function. We solved the crystal structures of these heterodimers and found that dynamic π-stacking interactions and polar contacts drive preferential heterodimeric interactions. Finally, we demonstrated the utility of our combYSelect heterodimers by engineering both a bispecific antibody and a cytokine trap for two unique therapeutic applications.
Collapse
Affiliation(s)
- Tala Azzam
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Jonathan J. Du
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Maria W. Flowers
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Adeela V. Ali
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Jeremy C. Hunn
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Nina Vijayvargiya
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Rushil Knagaram
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Marek Bogacz
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Kino E. Maravillas
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Diego E. Sastre
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - James K. Fields
- Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Ardalan Mirzaei
- Sydney Pharmacy School, Faculty of Medicine and Health, The University of Sydney, Camperdown, NSW, Australia
| | - Brian G. Pierce
- University of Maryland Institute for Bioscience and Biotechnology Research, Rockville, MD 20850, USA
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, MD 20850, USA
| | - Eric J. Sundberg
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| |
Collapse
|
2
|
Fields JK, Gyllenbäck EJ, Bogacz M, Obi J, Birkedal GS, Sjöström K, Maravillas K, Grönberg C, Rattik S, Kihn K, Flowers M, Smith AK, Hansen N, Fioretos T, Huyhn C, Liberg D, Deredge D, Sundberg EJ. Antibodies targeting the shared cytokine receptor IL-1 receptor accessory protein invoke distinct mechanisms to block all cytokine signaling. Cell Rep 2024:114099. [PMID: 38636519 DOI: 10.1016/j.celrep.2024.114099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 02/24/2024] [Accepted: 03/27/2024] [Indexed: 04/20/2024] Open
Abstract
Interleukin-1 (IL-1)-family cytokines are potent modulators of inflammation, coordinating a vast array of immunological responses across innate and adaptive immune systems. Dysregulated IL-1-family cytokine signaling, however, is involved in a multitude of adverse health effects, such as chronic inflammatory conditions, autoimmune diseases, and cancer. Within the IL-1 family of cytokines, six-IL-1α, IL-1β, IL-33, IL-36α, IL-36β, and IL-36γ-require the IL-1 receptor accessory protein (IL-1RAcP) as their shared co-receptor. Common features of cytokine signaling include redundancy of signaling pathways, sharing of cytokines and receptors, pleiotropy of the cytokines themselves, and multifaceted immune responses. Accordingly, targeting multiple cytokines simultaneously is an emerging therapeutic strategy and can provide advantages over targeting a single cytokine pathway. Here, we show that two monoclonal antibodies, CAN10 and 3G5, which target IL-1RAcP for broad blockade of all associated cytokines, do so through distinct mechanisms and provide therapeutic opportunities for the treatment of inflammatory diseases.
Collapse
Affiliation(s)
- James K Fields
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA; Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD 21201, USA
| | | | - Marek Bogacz
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Juliet Obi
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD 21201, USA
| | | | | | - Kino Maravillas
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | | | | | - Kyle Kihn
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD 21201, USA
| | - Maria Flowers
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Ally K Smith
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD 21201, USA
| | - Nils Hansen
- Division of Clinical Genetics, Department of Laboratory Medicine, Lund University, Lund, Sweden
| | - Thoas Fioretos
- Division of Clinical Genetics, Department of Laboratory Medicine, Lund University, Lund, Sweden
| | - Chau Huyhn
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA
| | | | - Daniel Deredge
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD 21201, USA
| | - Eric J Sundberg
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA.
| |
Collapse
|
3
|
Fields JK, Hicks CW, Wolberger C. Diverse modes of regulating methyltransferase activity by histone ubiquitination. Curr Opin Struct Biol 2023; 82:102649. [PMID: 37429149 PMCID: PMC10527252 DOI: 10.1016/j.sbi.2023.102649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 05/29/2023] [Accepted: 06/11/2023] [Indexed: 07/12/2023]
Abstract
Post-translational modification of histones plays a central role in regulating transcription. Methylation of histone H3 at lysines 4 (H3K4) and 79 (H3K79) play roles in activating transcription whereas methylation of H3K27 is a repressive mark. These modifications, in turn, depend upon prior monoubiquitination of specific histone residues in a phenomenon known as histone crosstalk. Earlier work had provided insights into the mechanism by which monoubiquitination histone H2BK120 stimulates H3K4 methylation by COMPASS/MLL1 and H3K79 methylation by DOT1L, and monoubiquitinated H2AK119 stimulates methylation of H3K27 by the PRC2 complex. Recent studies have shed new light on the role of individual subunits and paralogs in regulating the activity of PRC2 and how additional post-translational modifications regulate yeast Dot1 and human DOT1L, as well as provided new insights into the regulation of MLL1 by H2BK120ub.
Collapse
Affiliation(s)
- James K Fields
- Department of Biophysics and Biophysical Chemistry, Johns Hopkins School of Medicine, Baltimore, MD, 21205, USA
| | - Chad W Hicks
- Department of Biophysics and Biophysical Chemistry, Johns Hopkins School of Medicine, Baltimore, MD, 21205, USA
| | - Cynthia Wolberger
- Department of Biophysics and Biophysical Chemistry, Johns Hopkins School of Medicine, Baltimore, MD, 21205, USA.
| |
Collapse
|
4
|
Haile ST, Rahman S, Fields JK, Orsburn BC, Bumpus NN, Wolberger C. The SAGA HAT module is tethered by its SWIRM domain and modulates activity of the SAGA DUB module. Biochim Biophys Acta Gene Regul Mech 2023; 1866:194929. [PMID: 36965704 PMCID: PMC10226619 DOI: 10.1016/j.bbagrm.2023.194929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 03/12/2023] [Accepted: 03/19/2023] [Indexed: 03/27/2023]
Abstract
The SAGA (Spt-Ada-Gcn5 acetyltransferase) complex is a transcriptional co-activator that both acetylates and deubiquitinates histones. The histone acetyltransferase (HAT) subunit, Gcn5, is part of a subcomplex of SAGA called the HAT module. A minimal HAT module complex containing Gcn5 bound to Ada2 and Ada3 is required for full Gcn5 activity on nucleosomes. Deletion studies have suggested that the Ada2 SWIRM domain plays a role in tethering the HAT module to the remainder of SAGA. While recent cryo-EM studies have resolved the structure of the core of the SAGA complex, the HAT module subunits and molecular details of its interactions with the SAGA core could not be resolved. Here we show that the SWIRM domain is required for incorporation of the HAT module into the yeast SAGA complex, but not the ADA complex, a distinct six-protein acetyltransferase complex that includes the SAGA HAT module proteins. In the isolated Gcn5/Ada2/Ada3 HAT module, deletion of the SWIRM domain modestly increased activity but had negligible effect on nucleosome binding. Loss of the HAT module due to deletion of the SWIRM domain decreases the H2B deubiquitinating activity of SAGA, indicating a role for the HAT module in regulating SAGA DUB module activity. A model of the HAT module created with Alphafold Multimer provides insights into the structural basis for our biochemical data, as well as prior deletion studies.
Collapse
Affiliation(s)
- Sara T Haile
- Department of Biophysics and Biophysical Chemistry, The Johns Hopkins University School of Medicine, 725 N. Wolfe Street, Baltimore, MD 21205, United States of America
| | - Sanim Rahman
- Department of Biophysics and Biophysical Chemistry, The Johns Hopkins University School of Medicine, 725 N. Wolfe Street, Baltimore, MD 21205, United States of America
| | - James K Fields
- Department of Biophysics and Biophysical Chemistry, The Johns Hopkins University School of Medicine, 725 N. Wolfe Street, Baltimore, MD 21205, United States of America
| | - Benjamin C Orsburn
- Department of Pharmacology and Molecular Sciences, The Johns Hopkins University School of Medicine, 725 N. Wolfe Street, Baltimore, MD 21205, United States of America
| | - Namandjé N Bumpus
- Department of Pharmacology and Molecular Sciences, The Johns Hopkins University School of Medicine, 725 N. Wolfe Street, Baltimore, MD 21205, United States of America
| | - Cynthia Wolberger
- Department of Biophysics and Biophysical Chemistry, The Johns Hopkins University School of Medicine, 725 N. Wolfe Street, Baltimore, MD 21205, United States of America.
| |
Collapse
|
5
|
Fields JK, Kihn K, Birkedal GS, Klontz EH, Sjöström K, Günther S, Beadenkopf R, Forsberg G, Liberg D, Snyder GA, Deredge D, Sundberg EJ. Molecular Basis of Selective Cytokine Signaling Inhibition by Antibodies Targeting a Shared Receptor. Front Immunol 2022; 12:779100. [PMID: 35003094 PMCID: PMC8740070 DOI: 10.3389/fimmu.2021.779100] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Accepted: 12/07/2021] [Indexed: 12/21/2022] Open
Abstract
Interleukin-1 (IL-1) family cytokines are potent mediators of inflammation, acting to coordinate local and systemic immune responses to a wide range of stimuli. Aberrant signaling by IL-1 family cytokine members, however, is linked to myriad inflammatory syndromes, autoimmune conditions and cancers. As such, blocking the inflammatory signals inherent to IL-1 family signaling is an established and expanding therapeutic strategy. While several FDA-approved IL-1 inhibitors exist, including an Fc fusion protein, a neutralizing antibody, and an antagonist cytokine, none specifically targets the co-receptor IL-1 receptor accessory protein (IL-1RAcP). Most IL-1 family cytokines form productive signaling complexes by binding first to their cognate receptors – IL-1RI for IL-1α and IL-1β; ST2 for IL-33; and IL-36R for IL-36α, IL-36β and IL-36γ – after which they recruit the shared secondary receptor IL-1RAcP to form a ternary cytokine/receptor/co-receptor complex. Recently, IL-1RAcP was identified as a biomarker for both AML and CML. IL-1RAcP has also been implicated in tumor progression in solid tumors and an anti-IL1RAP antibody (nadunolimab, CAN04) is in phase II clinical studies in pancreatic cancer and non-small cell lung cancer (NCT03267316). As IL-1RAcP is common to all of the abovementioned IL-1 family cytokines, targeting this co-receptor raises the possibility of selective signaling inhibition for different IL-1 family cytokines. Indeed, previous studies of IL-1β and IL-33 signaling complexes have revealed that these cytokines employ distinct mechanisms of IL-1RAcP recruitment even though their overall cytokine/receptor/co-receptor complexes are structurally similar. Here, using functional, biophysical, and structural analyses, we show that antibodies specific for IL-1RAcP can differentially block signaling by IL-1 family cytokines depending on the distinct IL-1RAcP epitopes that they engage. Our results indicate that targeting a shared cytokine receptor is a viable therapeutic strategy for selective cytokine signaling inhibition.
Collapse
Affiliation(s)
- James K Fields
- Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD, United States.,Department of Microbiology & Immunology, University of Maryland School of Medicine, Baltimore, MD, United States.,Program in Molecular Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Kyle Kihn
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD, United States
| | | | - Erik H Klontz
- Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD, United States.,Department of Microbiology & Immunology, University of Maryland School of Medicine, Baltimore, MD, United States.,Program in Molecular Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD, United States
| | | | - Sebastian Günther
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany
| | - Robert Beadenkopf
- Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD, United States
| | | | | | - Greg A Snyder
- Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD, United States.,Department of Microbiology & Immunology, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Daniel Deredge
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD, United States
| | - Eric J Sundberg
- Department of Biochemistry, Emory School of Medicine, Atlanta, GA, United States
| |
Collapse
|
6
|
Harberts EM, Varisco DJ, Fields JK, Izac JR, Gardner FM, Sundberg EJ, Snyder GA, Ernst RK. Lipid A mimetics BECC438 and BECC470 potentiate durable and balanced immune responses using an ovalbumin murine vaccine model. The Journal of Immunology 2021. [DOI: 10.4049/jimmunol.206.supp.59.02] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
Abstract
The need for effective infectious disease vaccines has become an inescapable topic over the past year. Continued development of next-generation vaccines that provide robust protective immunity is imperative. Such vaccines will likely include an adjuvant that avoids excessive adverse reactions and allows for dose and antigen sparing. Bacterial lipid A mimetics BECC438 and BECC470 have recently emerged as lead adjuvant candidates across several experimental models of infectious disease including Yersinia pestis (plague), human papilloma virus (HPV), and influenza-A (flu). To further define BECC438 and BECC470 as immuno-adjuvants, even without antigen from an infectious pathogen, studies presented here use ovalbumin (Ova) as a model antigen in a murine prime-boost vaccine model. Higher magnitude and more balanced production of antibody isotypes IgG1 and IgG2 are observed when BECC adjuvants are compared to classic adjuvants alum and PHAD. This optimal antibody response is durable and maintained for at least 12 weeks post-vaccination. Initial experiments use C57BL6 mice and are expanded to include BALBc and CD-1 (outbred) mice. Observed immune metrics maintained similar trends across male and females, and genetic backgrounds tested. Biacore immunogenicity analysis of C57BL6 serum found an increased half-life of Ova-specific antibodies in BECC438-adjuvanted animals potentially indicative of a higher antigen binding affinity. Toxicity studies conducted in New Zealand White rabbits report that BECC438 was well tolerated with no significant reactogenicity after 50μg and 100μg intra-muscular adjuvant injection. These studies provide continued evidence supporting development of BECC adjuvants in vaccines for human use.
Collapse
Affiliation(s)
- Erin M Harberts
- 1Department of Microbial Pathogenesis, University of Maryland School of Dentistry, Baltimore
| | - David J Varisco
- 1Department of Microbial Pathogenesis, University of Maryland School of Dentistry, Baltimore
| | - James K Fields
- 2Program in Molecular Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD
- 3Department of Microbiology and Immunology, School of Medicine, University of Maryland, Baltimore
- 4Institute of Human Virology, University of Maryland, School of Medicine, Baltimore, MD
| | - Jerilyn R Izac
- 1Department of Microbial Pathogenesis, University of Maryland School of Dentistry, Baltimore
| | - Francesca M Gardner
- 1Department of Microbial Pathogenesis, University of Maryland School of Dentistry, Baltimore
| | - Eric J Sundberg
- 5Department of Biochemistry, Emory University School of Medicine, Atlanta
| | - Greg A Snyder
- 3Department of Microbiology and Immunology, School of Medicine, University of Maryland, Baltimore
- 4Institute of Human Virology, University of Maryland, School of Medicine, Baltimore, MD
| | - Robert K Ernst
- 1Department of Microbial Pathogenesis, University of Maryland School of Dentistry, Baltimore
| |
Collapse
|
7
|
Klontz EH, Li C, Kihn K, Fields JK, Beckett D, Snyder GA, Wintrode PL, Deredge D, Wang LX, Sundberg EJ. Structure and dynamics of an α-fucosidase reveal a mechanism for highly efficient IgG transfucosylation. Nat Commun 2020; 11:6204. [PMID: 33277506 PMCID: PMC7718225 DOI: 10.1038/s41467-020-20044-z] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 09/15/2020] [Indexed: 11/26/2022] Open
Abstract
Fucosylation is important for the function of many proteins with biotechnical and medical applications. Alpha-fucosidases comprise a large enzyme family that recognizes fucosylated substrates with diverse α-linkages on these proteins. Lactobacillus casei produces an α-fucosidase, called AlfC, with specificity towards α(1,6)-fucose, the only linkage found in human N-glycan core fucosylation. AlfC and certain point mutants thereof have been used to add and remove fucose from monoclonal antibody N-glycans, with significant impacts on their effector functions. Despite the potential uses for AlfC, little is known about its mechanism. Here, we present crystal structures of AlfC, combined with mutational and kinetic analyses, hydrogen–deuterium exchange mass spectrometry, molecular dynamic simulations, and transfucosylation experiments to define the molecular mechanisms of the activities of AlfC and its transfucosidase mutants. Our results indicate that AlfC creates an aromatic subsite adjacent to the active site that specifically accommodates GlcNAc in α(1,6)-linkages, suggest that enzymatic activity is controlled by distinct open and closed conformations of an active-site loop, with certain mutations shifting the equilibrium towards open conformations to promote transfucosylation over hydrolysis, and provide a potentially generalizable framework for the rational creation of AlfC transfucosidase mutants. AlfC transfucosidase is used to modulate fucosylation of glycans decorating monoclonal antibodies. Herein, structural and biophysical characterization reveals the enzymatic mechanism of AlfC and a blueprint for the design of AlfC mutants with novel specificities and functions.
Collapse
Affiliation(s)
- Erik H Klontz
- Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD, 21201, USA.,Department of Microbiology & Immunology, University of Maryland School of Medicine, Baltimore, MD, 21201, USA.,Program in Molecular Microbiology & Immunology, University of Maryland School of Medicine, Baltimore, MD, 21201, USA
| | - Chao Li
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD, 20742, USA
| | - Kyle Kihn
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, College Park, MD, 21201, USA
| | - James K Fields
- Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD, 21201, USA.,Department of Microbiology & Immunology, University of Maryland School of Medicine, Baltimore, MD, 21201, USA.,Program in Molecular Microbiology & Immunology, University of Maryland School of Medicine, Baltimore, MD, 21201, USA
| | - Dorothy Beckett
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD, 20742, USA
| | - Greg A Snyder
- Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD, 21201, USA
| | - Patrick L Wintrode
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, College Park, MD, 21201, USA
| | - Daniel Deredge
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, College Park, MD, 21201, USA
| | - Lai-Xi Wang
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD, 20742, USA
| | - Eric J Sundberg
- Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD, 21201, USA. .,Department of Microbiology & Immunology, University of Maryland School of Medicine, Baltimore, MD, 21201, USA. .,Department of Medicine, University of Maryland School of Medicine, Baltimore, MD, 21201, USA. .,Department of Biochemistry, Emory University School of Medicine, Atlanta, GA, 30322, USA.
| |
Collapse
|
8
|
Zhang Y, Du X, Liu M, Tang F, Zhang P, Ai C, Fields JK, Sundberg EJ, Latinovic OS, Devenport M, Zheng P, Liu Y. Abstract B3: Hijacking antibody-induced CTLA-4 lysosomal degradation for safer and more effective cancer immunotherapy. Cancer Immunol Res 2020. [DOI: 10.1158/2326-6074.tumimm19-b3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
It remains unclear why the clinically used anti-CTLA-4 antibodies, popularly called checkpoint inhibitors, have severe immunotherapy-related adverse effects (irAEs) and yet suboptimal cancer immunotherapeutic effects (CITE). Here we report that while irAE-prone Ipilimumab and TremeIgG1 rapidly direct cell surface CTLA-4 for lysosomal degradation, the non-irAE-prone antibodies we generated, HL12 or HL32, dissociate from CTLA-4 after endocytosis and allow CTLA-4 recycling to cell surface by the LRBA-dependent mechanism. Disrupting CTLA-4 recycling results in robust CTLA-4 downregulation by all anti-CTLA-4 antibodies and confers toxicity to a non-irAE-prone anti-CTLA-4 mAb. Conversely, increasing the pH sensitivity of TremeIgG1 by introducing designed tyrosine-to-histidine mutations prevents antibody-triggered lysosomal CTLA-4 downregulation and dramatically attenuates irAE. Surprisingly, by avoiding CTLA-4 downregulation and due to their increased bioavailability, pH-sensitive anti-CTLA-4 antibodies are more effective in intratumor regulatory T-cell depletion and rejection of large established tumors. Our data establish a new paradigm for cancer research that allows for abrogating irAE while increasing CITE of anti-CTLA-4 antibodies.
Citation Format: Yan Zhang, Xuexiang Du, Mingyue Liu, Fei Tang, Peng Zhang, Chunxia Ai, James K. Fields, Eric J. Sundberg, Olga S. Latinovic, Martin Devenport, Pan Zheng, Yang Liu. Hijacking antibody-induced CTLA-4 lysosomal degradation for safer and more effective cancer immunotherapy [abstract]. In: Proceedings of the AACR Special Conference on Tumor Immunology and Immunotherapy; 2019 Nov 17-20; Boston, MA. Philadelphia (PA): AACR; Cancer Immunol Res 2020;8(3 Suppl):Abstract nr B3.
Collapse
Affiliation(s)
- Yan Zhang
- 1University of Maryland School of Medicine, Baltimore, MD,
| | - Xuexiang Du
- 1University of Maryland School of Medicine, Baltimore, MD,
| | - Mingyue Liu
- 1University of Maryland School of Medicine, Baltimore, MD,
| | - Fei Tang
- 1University of Maryland School of Medicine, Baltimore, MD,
| | - Peng Zhang
- 1University of Maryland School of Medicine, Baltimore, MD,
| | - Chunxia Ai
- 1University of Maryland School of Medicine, Baltimore, MD,
| | | | | | | | | | - Pan Zheng
- 1University of Maryland School of Medicine, Baltimore, MD,
| | - Yang Liu
- 1University of Maryland School of Medicine, Baltimore, MD,
| |
Collapse
|
9
|
Abstract
Interleukin-1 (IL-1) family cytokines are key signaling molecules in both the innate and adaptive immune systems, mediating inflammation in response to a wide range of stimuli. The basic mechanism of signal initiation is a stepwise process in which an agonist cytokine binds its cognate receptor. Together, this cytokine-receptor complex recruits an often-common secondary receptor. Intracellularly, the Toll/IL-1 Receptor (TIR) domains of the two receptors are brought into close proximity, initiating an NF-κB signal transduction cascade. Due to the potent inflammatory response invoked by IL-1 family cytokines, several physiological mechanisms exist to inhibit IL-1 family signaling, including antagonist cytokines and decoy receptors. The numerous cytokines and receptors in the IL-1 superfamily are further classified into four subfamilies, dependent on their distinct cognate receptors—the IL-1, IL-33, and IL-36 subfamilies share IL-1RAcP as their secondary receptor, while IL-18 subfamily utilizes a distinct secondary receptor. Here, we describe how structural biology has informed our understanding of IL-1 family cytokine signaling, with a particular focus on molecular mechanisms of signaling complex formation and antagonism at the atomic level, as well as how these findings have advanced therapeutics to treat some chronic inflammatory diseases that are the result of dysregulated IL-1 signaling.
Collapse
Affiliation(s)
- James K Fields
- Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD, United States.,Department of Microbiology & Immunology, University of Maryland School of Medicine, Baltimore, MD, United States.,Program in Molecular Microbiology & Immunology, University of Maryland School of Medicine, Baltimore, MD, United States
| | | | - Eric J Sundberg
- Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD, United States.,Department of Microbiology & Immunology, University of Maryland School of Medicine, Baltimore, MD, United States.,Department of Medicine, University of Maryland School of Medicine, Baltimore, MD, United States
| |
Collapse
|
10
|
Klontz EH, Trastoy B, Deredge D, Fields JK, Li C, Orwenyo J, Marina A, Beadenkopf R, Günther S, Flores J, Wintrode PL, Wang LX, Guerin ME, Sundberg EJ. Molecular Basis of Broad Spectrum N-Glycan Specificity and Processing of Therapeutic IgG Monoclonal Antibodies by Endoglycosidase S2. ACS Cent Sci 2019; 5:524-538. [PMID: 30937380 PMCID: PMC6439443 DOI: 10.1021/acscentsci.8b00917] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Indexed: 06/02/2023]
Abstract
Immunoglobulin G (IgG) glycosylation critically modulates antibody effector functions. Streptococcus pyogenes secretes a unique endo-β-N-acetylglucosaminidase, EndoS2, which deglycosylates the conserved N-linked glycan at Asn297 on IgG Fc to eliminate its effector functions and evade the immune system. EndoS2 and specific point mutants have been used to chemoenzymatically synthesize antibodies with customizable glycosylation for gain of functions. EndoS2 is useful in these schemes because it accommodates a broad range of N-glycans, including high-mannose, complex, and hybrid types; however, its mechanism of substrate recognition is poorly understood. We present crystal structures of EndoS2 alone and bound to complex and high-mannose glycans; the broad N-glycan specificity is governed by critical loops that shape the binding site of EndoS2. Furthermore, hydrolytic experiments, domain-swap chimeras, and hydrogen-deuterium exchange mass spectrometry reveal the importance of the carbohydrate-binding module in the mechanism of IgG recognition by EndoS2, providing insights into engineering enzymes to catalyze customizable glycosylation reactions.
Collapse
Affiliation(s)
- Erik H. Klontz
- Institute
of Human Virology, Department of Microbiology & Immunology, and Program in Molecular
Microbiology & Immunology, University
of Maryland School of Medicine, Baltimore, Maryland 21201, United States
| | - Beatriz Trastoy
- Structural
Biology Unit, CIC bioGUNE, Bizkaia Technology Park, 48160 Derio, Spain
| | - Daniel Deredge
- Department
of Pharmaceutical Sciences, University of
Maryland School of Pharmacy, Baltimore, Maryland 21201, United States
| | - James K. Fields
- Institute
of Human Virology, Department of Microbiology & Immunology, and Program in Molecular
Microbiology & Immunology, University
of Maryland School of Medicine, Baltimore, Maryland 21201, United States
| | - Chao Li
- Department
of Chemistry and Biochemistry, University
of Maryland, College Park, Maryland 20742, United States
| | - Jared Orwenyo
- Department
of Chemistry and Biochemistry, University
of Maryland, College Park, Maryland 20742, United States
| | - Alberto Marina
- Structural
Biology Unit, CIC bioGUNE, Bizkaia Technology Park, 48160 Derio, Spain
| | - Robert Beadenkopf
- Institute
of Human Virology, Department of Microbiology & Immunology, and Program in Molecular
Microbiology & Immunology, University
of Maryland School of Medicine, Baltimore, Maryland 21201, United States
| | - Sebastian Günther
- Institute
of Human Virology, Department of Microbiology & Immunology, and Program in Molecular
Microbiology & Immunology, University
of Maryland School of Medicine, Baltimore, Maryland 21201, United States
- Photon
Science, Deutsches Elektronen-Synchrotron, Hamburg 22607, Germany
| | - Jair Flores
- Institute
of Human Virology, Department of Microbiology & Immunology, and Program in Molecular
Microbiology & Immunology, University
of Maryland School of Medicine, Baltimore, Maryland 21201, United States
| | - Patrick L. Wintrode
- Department
of Pharmaceutical Sciences, University of
Maryland School of Pharmacy, Baltimore, Maryland 21201, United States
| | - Lai-Xi Wang
- Department
of Chemistry and Biochemistry, University
of Maryland, College Park, Maryland 20742, United States
| | - Marcelo E. Guerin
- Structural
Biology Unit, CIC bioGUNE, Bizkaia Technology Park, 48160 Derio, Spain
- IKERBASQUE,
Basque Foundation for Science, 48013 Bilbao, Spain
| | - Eric J. Sundberg
- Institute
of Human Virology, Department of Microbiology & Immunology, and Program in Molecular
Microbiology & Immunology, University
of Maryland School of Medicine, Baltimore, Maryland 21201, United States
- Department
of Medicine, University of Maryland School
of Medicine, Baltimore, Maryland 21201, United States
| |
Collapse
|
11
|
Ronish LA, Lillehoj E, Fields JK, Sundberg EJ, Piepenbrink KH. The structure of PilA from Acinetobacter baumannii AB5075 suggests a mechanism for functional specialization in Acinetobacter type IV pili. J Biol Chem 2018; 294:218-230. [PMID: 30413536 DOI: 10.1074/jbc.ra118.005814] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 10/19/2018] [Indexed: 11/06/2022] Open
Abstract
Type IV pili (T4P) are bacterial appendages composed of protein subunits, called pilins, noncovalently assembled into helical fibers. T4P are essential, in many bacterial species, for processes as diverse as twitching motility, natural competence, biofilm or microcolony formation, and host cell adhesion. The genes encoding type IV pili are found universally in the Gram-negative, aerobic, nonflagellated, and pathogenic coccobacillus Acinetobacter baumannii, but there is considerable variation in PilA, the major protein subunit, both in amino acid sequence and in glycosylation patterns. Here we report the X-ray crystal structure of PilA from AB5075, a recently characterized, highly virulent isolate, at 1.9 Å resolution and compare it to homologues from A. baumannii strains ACICU and BIDMC57, which are C-terminally glycosylated. These structural comparisons revealed that PilAAB5075 exhibits a distinctly electronegative surface chemistry. To understand the functional consequences of this change in surface electrostatics, we complemented a ΔpilA knockout strain with divergent pilA genes from ACICU, BIDMC57, and AB5075. The resulting transgenic strains showed differential twitching motility and biofilm formation while maintaining the ability to adhere to epithelial cells. PilAAB5075 and PilAACICU, although structurally similar, promote different characteristics, favoring twitching motility and biofilm formation, respectively. These results support a model in which differences in pilus electrostatics affect the equilibrium of microcolony formation, which in turn alters the balance between motility and biofilm formation in Acinetobacter.
Collapse
Affiliation(s)
- Leslie A Ronish
- Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588
| | - Erik Lillehoj
- Department of Pediatrics, University of Maryland School of Medicine, Baltimore, Maryland 21201
| | - James K Fields
- Institute of Human Virology, University of Maryland School of Medicine, Baltimore, Maryland 21201
| | - Eric J Sundberg
- Institute of Human Virology, University of Maryland School of Medicine, Baltimore, Maryland 21201; Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland 21201; Departments of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland 21201
| | - Kurt H Piepenbrink
- Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588; Departments of Food Science and Technology, University of Nebraska-Lincoln, Lincoln, Nebraska 68588; Nebraska Food for Health Center, University of Nebraska-Lincoln, Lincoln, Nebraska 68588; Center for Integrated Biomolecular Communication, University of Nebraska-Lincoln, Lincoln, Nebraska 68588.
| |
Collapse
|
12
|
Kaur K, Wu X, Fields JK, Johnson DK, Lan L, Pratt M, Somoza AD, Wang CCC, Karanicolas J, Oakley BR, Xu L, De Guzman RN. The fungal natural product azaphilone-9 binds to HuR and inhibits HuR-RNA interaction in vitro. PLoS One 2017; 12:e0175471. [PMID: 28414767 PMCID: PMC5393604 DOI: 10.1371/journal.pone.0175471] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Accepted: 03/27/2017] [Indexed: 11/18/2022] Open
Abstract
The RNA-binding protein Hu antigen R (HuR) binds to AU-rich elements (ARE) in the 3'-untranslated region (UTR) of target mRNAs. The HuR-ARE interactions stabilize many oncogenic mRNAs that play important roles in tumorigenesis. Thus, small molecules that interfere with the HuR-ARE interaction could potentially inhibit cancer cell growth and progression. Using a fluorescence polarization (FP) competition assay, we identified the compound azaphilone-9 (AZA-9) derived from the fungal natural product asperbenzaldehyde, binds to HuR and inhibits HuR-ARE interaction (IC50 ~1.2 μM). Results from surface plasmon resonance (SPR) verified the direct binding of AZA-9 to HuR. NMR methods mapped the RNA-binding interface of HuR and identified the involvement of critical RNA-binding residues in binding of AZA-9. Computational docking was then used to propose a likely binding site for AZA-9 in the RNA-binding cleft of HuR. Our results show that AZA-9 blocks key RNA-binding residues of HuR and disrupts HuR-RNA interactions in vitro. This knowledge is needed in developing more potent AZA-9 derivatives that could lead to new cancer therapy.
Collapse
Affiliation(s)
- Kawaljit Kaur
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, United States of America
| | - Xiaoqing Wu
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, United States of America
| | - James K Fields
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, United States of America
| | - David K Johnson
- Molecular Graphics and Modeling Laboratory and the Computational Chemical Biology Core, University of Kansas, Lawrence, Kansas, United States of America
| | - Lan Lan
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, United States of America
| | - Miranda Pratt
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, United States of America
| | - Amber D Somoza
- Department of Chemistry, University of Southern California, Los Angeles, California, United States of America
| | - Clay C C Wang
- Department of Chemistry, University of Southern California, Los Angeles, California, United States of America.,Department of Pharmacology and Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, California United States of America
| | - John Karanicolas
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, United States of America.,Center for Computational Biology, University of Kansas, Lawrence, Kansas, United States of America
| | - Berl R Oakley
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, United States of America
| | - Liang Xu
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, United States of America
| | - Roberto N De Guzman
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, United States of America
| |
Collapse
|
13
|
|