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Schmitt S, Machui P, Mai I, Herterich S, Wunder S, Cyprys P, Gerlach M, Ochtrop P, Hackenberger CP, Schumacher D, Helma J, Vogl AM, Kasper MA. Design and Evaluation of Phosphonamidate-Linked Exatecan Constructs for Highly Loaded, Stable, and Efficacious Antibody-Drug Conjugates. Mol Cancer Ther 2024; 23:199-211. [PMID: 37828728 PMCID: PMC10831470 DOI: 10.1158/1535-7163.mct-23-0359] [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: 06/10/2023] [Revised: 08/30/2023] [Accepted: 10/10/2023] [Indexed: 10/14/2023]
Abstract
Topoisomerase I (TOP1) Inhibitors constitute an emerging payload class to engineer antibody-drug conjugates (ADC) as next-generation biopharmaceutical for cancer treatment. Existing ADCs are using camptothecin payloads with lower potency and suffer from limited stability in circulation. With this study, we introduce a novel camptothecin-based linker-payload platform based on the highly potent camptothecin derivative exatecan. First, we describe general challenges that arise from the hydrophobic combination of exatecan and established dipeptidyl p-aminobenzyl-carbamate (PAB) cleavage sites such as reduced antibody conjugation yields and ADC aggregation. After evaluating several linker-payload structures, we identified ethynyl-phosphonamidates in combination with a discrete PEG24 chain to compensate for the hydrophobic PAB-exatecan moiety. Furthermore, we demonstrate that the identified linker-payload structure enables the construction of highly loaded DAR8 ADCs with excellent solubility properties. Head-to-head comparison with Enhertu, an approved camptothecin-based ADC, revealed improved target-mediated killing of tumor cells, excellent bystander killing, drastically improved linker stability in vitro and in vivo and superior in vivo efficacy over four tested dose levels in a xenograft model. Moreover, we show that ADCs based on the novel exatecan linker-payload platform exhibit antibody-like pharmacokinetic properties, even when the ADCs are highly loaded with eight drug molecules per antibody. This ADC platform constitutes a new and general solution to deliver TOP1 inhibitors with highest efficiency to the site of the tumor, independent of the antibody and its target, and is thereby broadly applicable to various cancer indications.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Christian P.R. Hackenberger
- Chemical Biology Department, Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Berlin, Germany
- Department of Chemistry, Humboldt Universität zu Berlin, Berlin, Germany
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Kulich I, Vogler F, Bleckmann A, Cyprys P, Lindemeier M, Fuchs I, Krassini L, Schubert T, Steinbrenner J, Beynon J, Falter-Braun P, Längst G, Dresselhaus T, Sprunck S. Author Correction: ARMADILLO REPEAT ONLY proteins confine Rho GTPase signalling to polar growth sites. Nat Plants 2021; 7:234. [PMID: 33408348 DOI: 10.1038/s41477-020-00841-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Affiliation(s)
- Ivan Kulich
- Cell Biology and Plant Biochemistry, University of Regensburg, Regensburg, Germany
| | - Frank Vogler
- Cell Biology and Plant Biochemistry, University of Regensburg, Regensburg, Germany
| | - Andrea Bleckmann
- Cell Biology and Plant Biochemistry, University of Regensburg, Regensburg, Germany
| | - Philipp Cyprys
- Cell Biology and Plant Biochemistry, University of Regensburg, Regensburg, Germany
| | - Maria Lindemeier
- Cell Biology and Plant Biochemistry, University of Regensburg, Regensburg, Germany
| | - Ingrid Fuchs
- Cell Biology and Plant Biochemistry, University of Regensburg, Regensburg, Germany
| | - Laura Krassini
- Cell Biology and Plant Biochemistry, University of Regensburg, Regensburg, Germany
| | | | - Jens Steinbrenner
- School of Life Sciences, Warwick University, Coventry, UK
- Institute for Phytopathology and Applied Zoology, University of Giessen, Giessen, Germany
| | - Jim Beynon
- School of Life Sciences, Warwick University, Coventry, UK
| | - Pascal Falter-Braun
- Department of Plant Systems Biology, Center of Life and Food Sciences Weihenstephan, Technische Universität München, Freising, Germany
- Institute of Network Biology (INET), Helmholtz Zentrum München, Neuherberg, Germany
- Microbe-Host Interactions, Faculty of Biology, Ludwig-Maximilians-Universität (LMU) München, Munich, Germany
| | - Gernot Längst
- Biochemistry III, Biochemistry Centre Regensburg, University of Regensburg, Regensburg, Germany
| | - Thomas Dresselhaus
- Cell Biology and Plant Biochemistry, University of Regensburg, Regensburg, Germany
| | - Stefanie Sprunck
- Cell Biology and Plant Biochemistry, University of Regensburg, Regensburg, Germany.
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Kulich I, Vogler F, Bleckmann A, Cyprys P, Lindemeier M, Fuchs I, Krassini L, Schubert T, Steinbrenner J, Beynon J, Falter-Braun P, Längst G, Dresselhaus T, Sprunck S. ARMADILLO REPEAT ONLY proteins confine Rho GTPase signalling to polar growth sites. Nat Plants 2020; 6:1275-1288. [PMID: 33020609 DOI: 10.1038/s41477-020-00781-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Accepted: 09/03/2020] [Indexed: 06/11/2023]
Abstract
Polar growth requires the precise tuning of Rho GTPase signalling at distinct plasma membrane domains. The activity of Rho of plant (ROP) GTPases is regulated by the opposing action of guanine nucleotide-exchange factors (GEFs) and GTPase-activating proteins (GAPs). Whereas plant-specific ROPGEFs have been shown to be embedded in higher-level regulatory mechanisms involving membrane-bound receptor-like kinases, the regulation of GAPs has remained enigmatic. Here, we show that three Arabidopsis ARMADILLO REPEAT ONLY (ARO) proteins are essential for the stabilization of growth sites in root hair cells and trichomes. AROs interact with ROP1 enhancer GAPs (RENGAPs) and bind to the plasma membrane via a conserved polybasic region at the ARO amino terminus. The ectopic spreading of ROP2 in aro2/3/4 mutant root hair cells and the preferential interaction of AROs with active ROPs and anionic phospholipids suggests that AROs recruit RENGAPs into complexes with ROPs to confine ROP signalling to distinct membrane regions.
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Affiliation(s)
- Ivan Kulich
- Cell Biology and Plant Biochemistry, University of Regensburg, Regensburg, Germany
| | - Frank Vogler
- Cell Biology and Plant Biochemistry, University of Regensburg, Regensburg, Germany
| | - Andrea Bleckmann
- Cell Biology and Plant Biochemistry, University of Regensburg, Regensburg, Germany
| | - Philipp Cyprys
- Cell Biology and Plant Biochemistry, University of Regensburg, Regensburg, Germany
| | - Maria Lindemeier
- Cell Biology and Plant Biochemistry, University of Regensburg, Regensburg, Germany
| | - Ingrid Fuchs
- Cell Biology and Plant Biochemistry, University of Regensburg, Regensburg, Germany
| | - Laura Krassini
- Cell Biology and Plant Biochemistry, University of Regensburg, Regensburg, Germany
| | | | - Jens Steinbrenner
- School of Life Sciences, Warwick University, Coventry, UK
- Institute for Phytopathology and Applied Zoology, University of Giessen, Giessen, Germany
| | - Jim Beynon
- School of Life Sciences, Warwick University, Coventry, UK
| | - Pascal Falter-Braun
- Department of Plant Systems Biology, Center of Life and Food Sciences Weihenstephan, Technische Universität München, Freising, Germany
- Institute of Network Biology (INET), Helmholtz Zentrum München, Neuherberg, Germany
- Microbe-Host Interactions, Faculty of Biology, Ludwig-Maximilians-Universität (LMU) München, Munich, Germany
| | - Gernot Längst
- Biochemistry III, Biochemistry Centre Regensburg, University of Regensburg, Regensburg, Germany
| | - Thomas Dresselhaus
- Cell Biology and Plant Biochemistry, University of Regensburg, Regensburg, Germany
| | - Stefanie Sprunck
- Cell Biology and Plant Biochemistry, University of Regensburg, Regensburg, Germany.
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Resentini F, Cyprys P, Steffen JG, Alter S, Morandini P, Mizzotti C, Lloyd A, Drews GN, Dresselhaus T, Colombo L, Sprunck S, Masiero S. SUPPRESSOR OF FRIGIDA (SUF4) Supports Gamete Fusion via Regulating Arabidopsis EC1 Gene Expression. Plant Physiol 2017; 173:155-166. [PMID: 27920160 PMCID: PMC5210714 DOI: 10.1104/pp.16.01024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2016] [Accepted: 12/05/2016] [Indexed: 05/03/2023]
Abstract
The EGG CELL1 (EC1) gene family of Arabidopsis (Arabidopsis thaliana) comprises five members that are specifically expressed in the egg cell and redundantly control gamete fusion during double fertilization. We investigated the activity of all five EC1 promoters in promoter-deletion studies and identified SUF4 (SUPPRESSOR OF FRIGIDA4), a C2H2 transcription factor, as a direct regulator of the EC1 gene expression. In particular, we demonstrated that SUF4 binds to all five Arabidopsis EC1 promoters, thus regulating their expression. The down-regulation of SUF4 in homozygous suf4-1 ovules results in reduced EC1 expression and delayed sperm fusion, which can be rescued by expressing SUF4-β-glucuronidase under the control of the SUF4 promoter. To identify more gene products able to regulate EC1 expression together with SUF4, we performed coexpression studies that led to the identification of MOM1 (MORPHEUS' MOLECULE1), a component of a silencing mechanism that is independent of DNA methylation marks. In mom1-3 ovules, both SUF4 and EC1 genes are down-regulated, and EC1 genes show higher levels of histone 3 lysine-9 acetylation, suggesting that MOM1 contributes to the regulation of SUF4 and EC1 gene expression.
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Affiliation(s)
- Francesca Resentini
- Dipartimento di Bioscienze, Università degli Studi di Milano, 20133 Milan, Italy (F.R., P.M., C.M., L.C., S.M.)
- Lehrstuhl Zellbiologie und Pflanzenbiochemie, Biochemie-Zentrum Regensburg, Universität Regensburg, D-93053 Regensburg, Germany (P.C., S.A., T.D., S.S.)
- Department of Biology, University of Utah, Salt Lake City, Utah 84112 (J.G.S., A.L., G.N.D.); and
- Istituto di Biofisica, Consiglio Nazionale delle Ricerche, Università di Milano, 20133 Milan, Italy (P.M., L.C.)
| | - Philipp Cyprys
- Dipartimento di Bioscienze, Università degli Studi di Milano, 20133 Milan, Italy (F.R., P.M., C.M., L.C., S.M.)
- Lehrstuhl Zellbiologie und Pflanzenbiochemie, Biochemie-Zentrum Regensburg, Universität Regensburg, D-93053 Regensburg, Germany (P.C., S.A., T.D., S.S.)
- Department of Biology, University of Utah, Salt Lake City, Utah 84112 (J.G.S., A.L., G.N.D.); and
- Istituto di Biofisica, Consiglio Nazionale delle Ricerche, Università di Milano, 20133 Milan, Italy (P.M., L.C.)
| | - Joshua G Steffen
- Dipartimento di Bioscienze, Università degli Studi di Milano, 20133 Milan, Italy (F.R., P.M., C.M., L.C., S.M.)
- Lehrstuhl Zellbiologie und Pflanzenbiochemie, Biochemie-Zentrum Regensburg, Universität Regensburg, D-93053 Regensburg, Germany (P.C., S.A., T.D., S.S.)
- Department of Biology, University of Utah, Salt Lake City, Utah 84112 (J.G.S., A.L., G.N.D.); and
- Istituto di Biofisica, Consiglio Nazionale delle Ricerche, Università di Milano, 20133 Milan, Italy (P.M., L.C.)
| | - Svenja Alter
- Dipartimento di Bioscienze, Università degli Studi di Milano, 20133 Milan, Italy (F.R., P.M., C.M., L.C., S.M.)
- Lehrstuhl Zellbiologie und Pflanzenbiochemie, Biochemie-Zentrum Regensburg, Universität Regensburg, D-93053 Regensburg, Germany (P.C., S.A., T.D., S.S.)
- Department of Biology, University of Utah, Salt Lake City, Utah 84112 (J.G.S., A.L., G.N.D.); and
- Istituto di Biofisica, Consiglio Nazionale delle Ricerche, Università di Milano, 20133 Milan, Italy (P.M., L.C.)
| | - Piero Morandini
- Dipartimento di Bioscienze, Università degli Studi di Milano, 20133 Milan, Italy (F.R., P.M., C.M., L.C., S.M.)
- Lehrstuhl Zellbiologie und Pflanzenbiochemie, Biochemie-Zentrum Regensburg, Universität Regensburg, D-93053 Regensburg, Germany (P.C., S.A., T.D., S.S.)
- Department of Biology, University of Utah, Salt Lake City, Utah 84112 (J.G.S., A.L., G.N.D.); and
- Istituto di Biofisica, Consiglio Nazionale delle Ricerche, Università di Milano, 20133 Milan, Italy (P.M., L.C.)
| | - Chiara Mizzotti
- Dipartimento di Bioscienze, Università degli Studi di Milano, 20133 Milan, Italy (F.R., P.M., C.M., L.C., S.M.)
- Lehrstuhl Zellbiologie und Pflanzenbiochemie, Biochemie-Zentrum Regensburg, Universität Regensburg, D-93053 Regensburg, Germany (P.C., S.A., T.D., S.S.)
- Department of Biology, University of Utah, Salt Lake City, Utah 84112 (J.G.S., A.L., G.N.D.); and
- Istituto di Biofisica, Consiglio Nazionale delle Ricerche, Università di Milano, 20133 Milan, Italy (P.M., L.C.)
| | - Alan Lloyd
- Dipartimento di Bioscienze, Università degli Studi di Milano, 20133 Milan, Italy (F.R., P.M., C.M., L.C., S.M.)
- Lehrstuhl Zellbiologie und Pflanzenbiochemie, Biochemie-Zentrum Regensburg, Universität Regensburg, D-93053 Regensburg, Germany (P.C., S.A., T.D., S.S.)
- Department of Biology, University of Utah, Salt Lake City, Utah 84112 (J.G.S., A.L., G.N.D.); and
- Istituto di Biofisica, Consiglio Nazionale delle Ricerche, Università di Milano, 20133 Milan, Italy (P.M., L.C.)
| | - Gary N Drews
- Dipartimento di Bioscienze, Università degli Studi di Milano, 20133 Milan, Italy (F.R., P.M., C.M., L.C., S.M.)
- Lehrstuhl Zellbiologie und Pflanzenbiochemie, Biochemie-Zentrum Regensburg, Universität Regensburg, D-93053 Regensburg, Germany (P.C., S.A., T.D., S.S.)
- Department of Biology, University of Utah, Salt Lake City, Utah 84112 (J.G.S., A.L., G.N.D.); and
- Istituto di Biofisica, Consiglio Nazionale delle Ricerche, Università di Milano, 20133 Milan, Italy (P.M., L.C.)
| | - Thomas Dresselhaus
- Dipartimento di Bioscienze, Università degli Studi di Milano, 20133 Milan, Italy (F.R., P.M., C.M., L.C., S.M.)
- Lehrstuhl Zellbiologie und Pflanzenbiochemie, Biochemie-Zentrum Regensburg, Universität Regensburg, D-93053 Regensburg, Germany (P.C., S.A., T.D., S.S.)
- Department of Biology, University of Utah, Salt Lake City, Utah 84112 (J.G.S., A.L., G.N.D.); and
- Istituto di Biofisica, Consiglio Nazionale delle Ricerche, Università di Milano, 20133 Milan, Italy (P.M., L.C.)
| | - Lucia Colombo
- Dipartimento di Bioscienze, Università degli Studi di Milano, 20133 Milan, Italy (F.R., P.M., C.M., L.C., S.M.)
- Lehrstuhl Zellbiologie und Pflanzenbiochemie, Biochemie-Zentrum Regensburg, Universität Regensburg, D-93053 Regensburg, Germany (P.C., S.A., T.D., S.S.)
- Department of Biology, University of Utah, Salt Lake City, Utah 84112 (J.G.S., A.L., G.N.D.); and
- Istituto di Biofisica, Consiglio Nazionale delle Ricerche, Università di Milano, 20133 Milan, Italy (P.M., L.C.)
| | - Stefanie Sprunck
- Dipartimento di Bioscienze, Università degli Studi di Milano, 20133 Milan, Italy (F.R., P.M., C.M., L.C., S.M.);
- Lehrstuhl Zellbiologie und Pflanzenbiochemie, Biochemie-Zentrum Regensburg, Universität Regensburg, D-93053 Regensburg, Germany (P.C., S.A., T.D., S.S.);
- Department of Biology, University of Utah, Salt Lake City, Utah 84112 (J.G.S., A.L., G.N.D.); and
- Istituto di Biofisica, Consiglio Nazionale delle Ricerche, Università di Milano, 20133 Milan, Italy (P.M., L.C.)
| | - Simona Masiero
- Dipartimento di Bioscienze, Università degli Studi di Milano, 20133 Milan, Italy (F.R., P.M., C.M., L.C., S.M.);
- Lehrstuhl Zellbiologie und Pflanzenbiochemie, Biochemie-Zentrum Regensburg, Universität Regensburg, D-93053 Regensburg, Germany (P.C., S.A., T.D., S.S.);
- Department of Biology, University of Utah, Salt Lake City, Utah 84112 (J.G.S., A.L., G.N.D.); and
- Istituto di Biofisica, Consiglio Nazionale delle Ricerche, Università di Milano, 20133 Milan, Italy (P.M., L.C.)
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Hou Y, Guo X, Cyprys P, Zhang Y, Bleckmann A, Cai L, Huang Q, Luo Y, Gu H, Dresselhaus T, Dong J, Qu LJ. Maternal ENODLs Are Required for Pollen Tube Reception in Arabidopsis. Curr Biol 2016; 26:2343-50. [PMID: 27524487 DOI: 10.1016/j.cub.2016.06.053] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Revised: 05/31/2016] [Accepted: 06/22/2016] [Indexed: 01/02/2023]
Abstract
During the angiosperm (flowering-plant) life cycle, double fertilization represents the hallmark between diploid and haploid generations [1]. The success of double fertilization largely depends on compatible communication between the male gametophyte (pollen tube) and the maternal tissues of the flower, culminating in precise pollen tube guidance to the female gametophyte (embryo sac) and its rupture to release sperm cells. Several important factors involved in the pollen tube reception have been identified recently [2-6], but the underlying signaling pathways are far from being understood. Here, we report that a group of female-specific small proteins, early nodulin-like proteins (ENODLs, or ENs), are required for pollen tube reception. ENs are featured with a plastocyanin-like (PCNL) domain, an arabinogalactan (AG) glycomodule, and a predicted glycosylphosphatidylinositol (GPI) anchor motif. We show that ENs are asymmetrically distributed at the plasma membrane of the synergid cells and accumulate at the filiform apparatus, where arriving pollen tubes communicate with the embryo sac. EN14 strongly and specifically interacts with the extracellular domain of the receptor-like kinase FERONIA, localized at the synergid cell surface and known to critically control pollen tube reception [6]. Wild-type pollen tubes failed to arrest growth and to rupture after entering the ovules of quintuple loss-of-function EN mutants, indicating a central role of ENs in male-female communication and pollen tube reception. Moreover, overexpression of EN15 by the endogenous promoter caused disturbed pollen tube guidance and reduced fertility. These data suggest that female-derived GPI-anchored ENODLs play an essential role in male-female communication and fertilization.
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Affiliation(s)
- Yingnan Hou
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at School of Life Sciences, Peking University, Beijing 100871, PRC
| | - Xinyang Guo
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at School of Life Sciences, Peking University, Beijing 100871, PRC
| | - Philipp Cyprys
- Department of Cell Biology and Plant Biochemistry, Biochemie-Zentrum Regensburg, University of Regensburg, 93053 Regensburg, Germany
| | - Ying Zhang
- Waksman Institute of Microbiology, Rutgers, State University of New Jersey, Piscataway, NJ 08854, USA
| | - Andrea Bleckmann
- Department of Cell Biology and Plant Biochemistry, Biochemie-Zentrum Regensburg, University of Regensburg, 93053 Regensburg, Germany
| | - Le Cai
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at School of Life Sciences, Peking University, Beijing 100871, PRC
| | - Qingpei Huang
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at School of Life Sciences, Peking University, Beijing 100871, PRC
| | - Yu Luo
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at School of Life Sciences, Peking University, Beijing 100871, PRC
| | - Hongya Gu
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at School of Life Sciences, Peking University, Beijing 100871, PRC; National Plant Gene Research Center (Beijing), Beijing 100101, PRC
| | - Thomas Dresselhaus
- Department of Cell Biology and Plant Biochemistry, Biochemie-Zentrum Regensburg, University of Regensburg, 93053 Regensburg, Germany
| | - Juan Dong
- Waksman Institute of Microbiology, Rutgers, State University of New Jersey, Piscataway, NJ 08854, USA
| | - Li-Jia Qu
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at School of Life Sciences, Peking University, Beijing 100871, PRC; National Plant Gene Research Center (Beijing), Beijing 100101, PRC.
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