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Jacobs M, Bansal P, Shukla D, Schroeder CM. Understanding Supramolecular Assembly of Supercharged Proteins. ACS Cent Sci 2022; 8:1350-1361. [PMID: 36188338 PMCID: PMC9523778 DOI: 10.1021/acscentsci.2c00730] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Indexed: 06/16/2023]
Abstract
Ordered supramolecular assemblies have recently been created using electrostatic interactions between oppositely charged proteins. Despite recent progress, the fundamental mechanisms governing the assembly of oppositely supercharged proteins are not fully understood. Here, we use a combination of experiments and computational modeling to systematically study the supramolecular assembly process for a series of oppositely supercharged green fluorescent protein variants. We show that net charge is a sufficient molecular descriptor to predict the interaction fate of oppositely charged proteins under a given set of solution conditions (e.g., ionic strength), but the assembled supramolecular structures critically depend on surface charge distributions. Interestingly, our results show that a large excess of charge is necessary to nucleate assembly and that charged residues not directly involved in interprotein interactions contribute to a substantial fraction (∼30%) of the interaction energy between oppositely charged proteins via long-range electrostatic interactions. Dynamic subunit exchange experiments further show that relatively small, 16-subunit assemblies of oppositely charged proteins have kinetic lifetimes on the order of ∼10-40 min, which is governed by protein composition and solution conditions. Broadly, our results inform how protein supercharging can be used to create different ordered supramolecular assemblies from a single parent protein building block.
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Affiliation(s)
- Michael
I. Jacobs
- Beckman
Institute for Advanced Science and Technology, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Prateek Bansal
- Department
of Chemical and Biomolecular Engineering, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Diwakar Shukla
- Beckman
Institute for Advanced Science and Technology, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
- Department
of Chemical and Biomolecular Engineering, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Charles M. Schroeder
- Beckman
Institute for Advanced Science and Technology, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
- Department
of Chemical and Biomolecular Engineering, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
- Department
of Materials Science and Engineering, University
of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
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Chou L, Callmann CE, Dominguez D, Zhang B, Mirkin CA. Disrupting the Interplay between Programmed Cell Death Protein 1 and Programmed Death Ligand 1 with Spherical Nucleic Acids in Treating Cancer. ACS Cent Sci 2022; 8:1299-1305. [PMID: 36188343 PMCID: PMC9523766 DOI: 10.1021/acscentsci.2c00717] [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] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/19/2022] [Indexed: 06/16/2023]
Abstract
Disrupting the interplay between programmed cell death protein 1 (PD-1) and programmed death ligand 1 (PD-L1) is a powerful immunotherapeutic approach to cancer treatment. Herein, spherical nucleic acid (SNA) liposomal nanoparticle conjugates that incorporate a newly designed antisense DNA sequence specifically against PD-L1 (immune checkpoint inhibitor SNAs, or IC-SNAs) are explored as a strategy for blocking PD-1/PD-L1 signaling within the tumor microenvironment (TME). Concentration-dependent PD-L1 silencing with IC-SNAs is observed in MC38 colon cancer cells, where IC-SNAs decrease both surface PD-L1 (sPD-L1) and total PD-L1 expression. Furthermore, peritumoral administration of IC-SNAs in a syngeneic mouse model of MC38 colon cancer leads to reduced sPD-L1 expression in multiple cell populations within the TME, including tumor cells, dendritic cells, and myeloid derived suppressor cells. The treatment effectively increases CD8+ T cells accumulation and functionality in the TME, which ultimately inhibits tumor growth and extends animal survival. Taken together, these data show that IC-SNA nanoconstructs are capable of disrupting the PD-1/PD-L1 interplay via gene regulation, thereby providing a promising avenue for cancer immunotherapy.
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Affiliation(s)
- Liyushang Chou
- Interdisciplinary
Biological Sciences Graduate Program, International Institute
for Nanotechnology, and Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Cassandra E. Callmann
- Interdisciplinary
Biological Sciences Graduate Program, International Institute
for Nanotechnology, and Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Donye Dominguez
- Feinberg
School of Medicine, Northwestern University, Chicago, Illinois 60611, United States
| | - Bin Zhang
- Feinberg
School of Medicine, Northwestern University, Chicago, Illinois 60611, United States
| | - Chad A. Mirkin
- Interdisciplinary
Biological Sciences Graduate Program, International Institute
for Nanotechnology, and Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
- Feinberg
School of Medicine, Northwestern University, Chicago, Illinois 60611, United States
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Lin M, Meckes B, Chen C, Teplensky MH, Mirkin CA. Controlling Intracellular Machinery via Polymer Pen Lithography Molecular Patterning. ACS Cent Sci 2022; 8:1282-1289. [PMID: 36188351 PMCID: PMC9523772 DOI: 10.1021/acscentsci.2c00683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Indexed: 06/16/2023]
Abstract
The plasma membrane and the actomyosin cytoskeleton play key roles in controlling how cells sense and interact with their surrounding environment. Myosin, a force-generating actin network-associated protein, is a major regulator of plasma membrane tension, which helps control endocytosis. Despite the important link between plasma membranes and actomyosin (the actin-myosin complex), little is known about how the actomyosin arrangement regulates endocytosis. Here, nanoscopic ligand arrangements defined by polymer pen lithography (PPL) are used to control actomyosin contractility and examine cell uptake. Confocal microscopy, atomic force microscopy, and flow cytometry suggest that the cytoskeletal tension imposed by the nanoscopic ligand arrangement can actively regulate cellular uptake through clathrin- and caveolin-mediated pathways. Specifically, ligand arrangements that increase cytoskeletal tension tend to reduce the cellular uptakes of cholera toxin (CTX) and spherical nucleic acids (SNAs) by regulating endocytic budding and limiting the formation of clathrin- and caveolae-coated pits. Collectively, this work demonstrates how the cell endocytic fate is regulated by actomyosin mechanical forces, which can be tuned by subcellular cues defined by PPL.
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Affiliation(s)
- Millicent Lin
- Department
of Biomedical Engineering, Northwestern
University, 2145 Sheridan Road, Evanston, Illinois 60208, United
States
- International
Institute for Nanotechnology, 2145 Sheridan Road, Evanston, Illinois 60208, United
States
| | - Brian Meckes
- International
Institute for Nanotechnology, 2145 Sheridan Road, Evanston, Illinois 60208, United
States
- Department
of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Chaojian Chen
- International
Institute for Nanotechnology, 2145 Sheridan Road, Evanston, Illinois 60208, United
States
- Department
of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Michelle H. Teplensky
- International
Institute for Nanotechnology, 2145 Sheridan Road, Evanston, Illinois 60208, United
States
- Department
of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Chad A. Mirkin
- Department
of Biomedical Engineering, Northwestern
University, 2145 Sheridan Road, Evanston, Illinois 60208, United
States
- International
Institute for Nanotechnology, 2145 Sheridan Road, Evanston, Illinois 60208, United
States
- Department
of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
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Sharma A, Ramena GT, Elble RC. Advances in Intracellular Calcium Signaling Reveal Untapped Targets for Cancer Therapy. Biomedicines 2021; 9:1077. [PMID: 34572262 PMCID: PMC8466575 DOI: 10.3390/biomedicines9091077] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 07/15/2021] [Accepted: 07/18/2021] [Indexed: 02/07/2023] Open
Abstract
Intracellular Ca2+ distribution is a tightly regulated process. Numerous Ca2+ chelating, storage, and transport mechanisms are required to maintain normal cellular physiology. Ca2+-binding proteins, mainly calmodulin and calbindins, sequester free intracellular Ca2+ ions and apportion or transport them to signaling hubs needing the cations. Ca2+ channels, ATP-driven pumps, and exchangers assist the binding proteins in transferring the ions to and from appropriate cellular compartments. Some, such as the endoplasmic reticulum, mitochondria, and lysosomes, act as Ca2+ repositories. Cellular Ca2+ homeostasis is inefficient without the active contribution of these organelles. Moreover, certain key cellular processes also rely on inter-organellar Ca2+ signaling. This review attempts to encapsulate the structure, function, and regulation of major intracellular Ca2+ buffers, sensors, channels, and signaling molecules before highlighting how cancer cells manipulate them to survive and thrive. The spotlight is then shifted to the slow pace of translating such research findings into anticancer therapeutics. We use the PubMed database to highlight current clinical studies that target intracellular Ca2+ signaling. Drug repurposing and improving the delivery of small molecule therapeutics are further discussed as promising strategies for speeding therapeutic development in this area.
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Affiliation(s)
- Aarushi Sharma
- Department of Pharmacology and Simmons Cancer Institute, Southern Illinois University School of Medicine, Springfield, IL 62702, USA;
| | - Grace T. Ramena
- Department of Aquaculture, University of Arkansas, Pine Bluff, AR 71601, USA;
| | - Randolph C. Elble
- Department of Pharmacology and Simmons Cancer Institute, Southern Illinois University School of Medicine, Springfield, IL 62702, USA;
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Zhu J, Lin H, Kim Y, Yang M, Skakuj K, Du JS, Lee B, Schatz GC, Van Duyne RP, Mirkin CA. Light-Responsive Colloidal Crystals Engineered with DNA. Adv Mater 2020; 32:e1906600. [PMID: 31944429 PMCID: PMC7061716 DOI: 10.1002/adma.201906600] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [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: 10/08/2019] [Revised: 12/10/2019] [Indexed: 05/29/2023]
Abstract
A novel method for synthesizing and photopatterning colloidal crystals via light-responsive DNA is developed. These crystals are composed of 10-30 nm gold nanoparticles interconnected with azobenzene-modified DNA strands. The photoisomerization of the azobenzene molecules leads to reversible assembly and disassembly of the base-centered cubic (bcc) and face-centered cubic (fcc) crystalline nanoparticle lattices. In addition, UV light is used as a trigger to selectively remove nanoparticles on centimeter-scale thin films of colloidal crystals, allowing them to be photopatterned into preconceived shapes. The design of the azobenzene-modified linking DNA is critical and involves complementary strands, with azobenzene moieties deliberately staggered between the bases that define the complementary code. This results in a tunable wavelength-dependent melting temperature (Tm ) window (4.5-15 °C) and one suitable for affecting the desired transformations. In addition to the isomeric state of the azobenzene groups, the size of the particles can be used to modulate the Tm window over which these structures are light-responsive.
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Affiliation(s)
- Jinghan Zhu
- Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL, 60208, USA
- International Institute for Nanotechnology, 2190 Campus Drive, Evanston, IL, 60208, USA
| | - Haixin Lin
- International Institute for Nanotechnology, 2190 Campus Drive, Evanston, IL, 60208, USA
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA
| | - Youngeun Kim
- Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL, 60208, USA
- International Institute for Nanotechnology, 2190 Campus Drive, Evanston, IL, 60208, USA
| | - Muwen Yang
- International Institute for Nanotechnology, 2190 Campus Drive, Evanston, IL, 60208, USA
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA
| | - Kacper Skakuj
- International Institute for Nanotechnology, 2190 Campus Drive, Evanston, IL, 60208, USA
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA
| | - Jingshan S Du
- Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL, 60208, USA
- International Institute for Nanotechnology, 2190 Campus Drive, Evanston, IL, 60208, USA
| | - Byeongdu Lee
- X-Ray Science Division, Argonne National Laboratory, 9700 S. Cass Ave., Lemont, IL, 60439, USA
| | - George C Schatz
- International Institute for Nanotechnology, 2190 Campus Drive, Evanston, IL, 60208, USA
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA
| | - Richard P Van Duyne
- International Institute for Nanotechnology, 2190 Campus Drive, Evanston, IL, 60208, USA
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA
| | - Chad A Mirkin
- Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL, 60208, USA
- International Institute for Nanotechnology, 2190 Campus Drive, Evanston, IL, 60208, USA
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA
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