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Harnessing a catalytic lysine residue for the one-step preparation of homogeneous antibody-drug conjugates. Nat Commun 2017; 8:1112. [PMID: 29062027 PMCID: PMC5653646 DOI: 10.1038/s41467-017-01257-1] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Accepted: 09/01/2017] [Indexed: 01/09/2023] Open
Abstract
Current strategies to produce homogeneous antibody-drug conjugates (ADCs) rely on mutations or inefficient conjugation chemistries. Here we present a strategy to produce site-specific ADCs using a highly reactive natural buried lysine embedded in a dual variable domain (DVD) format. This approach is mutation free and drug conjugation proceeds rapidly at neutral pH in a single step without removing any charges. The conjugation chemistry is highly robust, enabling the use of crude DVD for ADC preparation. In addition, this strategy affords the ability to precisely monitor the efficiency of drug conjugation with a catalytic assay. ADCs targeting HER2 were prepared and demonstrated to be highly potent and specific in vitro and in vivo. Furthermore, the modular DVD platform was used to prepare potent and specific ADCs targeting CD138 and CD79B, two clinically established targets overexpressed in multiple myeloma and non-Hodgkin lymphoma, respectively. Current strategies for producing antibody-drug conjugates often rely on inefficient conjugation chemistry or on generating mutations in the antibody sequence. Here the authors demonstrate a mutation-free, single-step conjugation platform utilizing a buried lysine residue.
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Vallabhapurapu SD, Noothi SK, Pullum DA, Lawrie CH, Pallapati R, Potluri V, Kuntzen C, Khan S, Plas DR, Orlowski RZ, Chesi M, Kuehl WM, Bergsagel PL, Karin M, Vallabhapurapu S. Transcriptional repression by the HDAC4-RelB-p52 complex regulates multiple myeloma survival and growth. Nat Commun 2015; 6:8428. [PMID: 26455434 DOI: 10.1038/ncomms9428] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Accepted: 08/21/2015] [Indexed: 12/12/2022] Open
Abstract
Although transcriptional activation by NF-κB is well appreciated, physiological importance of transcriptional repression by NF-κB in cancer has remained elusive. Here we show that an HDAC4-RelB-p52 complex maintains repressive chromatin around proapoptotic genes Bim and BMF and regulates multiple myeloma (MM) survival and growth. Disruption of RelB-HDAC4 complex by a HDAC4-mimetic polypeptide blocks MM growth. RelB-p52 also represses BMF translation by regulating miR-221 expression. While the NIK-dependent activation of RelB-p52 in MM has been reported, we show that regardless of the activation status of NIK and the oncogenic events that cause plasma cell malignancy, several genetically diverse MM cells including Bortezomib-resistant MM cells are addicted to RelB-p52 for survival. Importantly, RelB is constitutively phosphorylated in MM and ERK1 is a RelB kinase. Phospho-RelB remains largely nuclear and is essential for Bim repression. Thus, ERK1-dependent regulation of nuclear RelB is critical for MM survival and explains the NIK-independent role of RelB in MM.
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Affiliation(s)
- Subrahmanya D Vallabhapurapu
- The Vontz Center for Molecular Studies, Department of Cancer and Cell Biology, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267, USA
| | - Sunil K Noothi
- The Vontz Center for Molecular Studies, Department of Cancer and Cell Biology, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267, USA
| | - Derek A Pullum
- The Vontz Center for Molecular Studies, Department of Cancer and Cell Biology, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267, USA
| | - Charles H Lawrie
- Department of Oncology, Biodonostia Research Institute, San Sebastián 20014, Spain.,Nuffield Department of Clinical Laboratory Sciences, University of Oxford, Oxford OX3 9DU, UK
| | - Rachel Pallapati
- The Vontz Center for Molecular Studies, Department of Cancer and Cell Biology, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267, USA
| | - Veena Potluri
- The Vontz Center for Molecular Studies, Department of Cancer and Cell Biology, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267, USA
| | - Christian Kuntzen
- Department of Medicine, Bridgeport Hospital, 267 Grant Street, Bridgeport, Connecticut 06610, USA
| | - Sohaib Khan
- The Vontz Center for Molecular Studies, Department of Cancer and Cell Biology, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267, USA
| | - David R Plas
- The Vontz Center for Molecular Studies, Department of Cancer and Cell Biology, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267, USA
| | - Robert Z Orlowski
- Department of Lymphoma/Myeloma, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, Texas 77030, USA
| | - Marta Chesi
- Department of Hematology/Oncology , Mayo Clinic, 13400 E. Shea Boulevard, Scottsdale, Arizona 85259, USA
| | - W Michael Kuehl
- Genetics Branch, Center for Cancer Research, National Cancer Institute, Building 37, Room 6002C, Bethesda, Maryland 20892, USA
| | - P Leif Bergsagel
- Department of Hematology/Oncology , Mayo Clinic, 13400 E. Shea Boulevard, Scottsdale, Arizona 85259, USA
| | - Michael Karin
- Laboratory of Gene Regulation and Signal Transduction, Departments of Pharmacology and Pathology, University of California, San Diego, California 92093, USA
| | - Sivakumar Vallabhapurapu
- The Vontz Center for Molecular Studies, Department of Cancer and Cell Biology, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267, USA
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