1
|
Tu X, Yin S, Zang J, Zhang T, Lv C, Zhao G. Understanding the Role of Filamentous Actin in Food Quality: From Structure to Application. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:11885-11899. [PMID: 38747409 DOI: 10.1021/acs.jafc.4c01877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
Actin, a multifunctional protein highly expressed in eukaryotes, is widely distributed throughout cells and serves as a crucial component of the cytoskeleton. Its presence is integral to maintaining cell morphology and participating in various biological processes. As an irreplaceable component of myofibrillar proteins, actin, including G-actin and F-actin, is highly related to food quality. Up to now, purification of actin at a moderate level remains to be overcome. In this paper, we have reviewed the structures and functions of actin, the methods to obtain actin, and the relationships between actin and food texture, color, and flavor. Moreover, actin finds applications in diverse fields such as food safety, bioengineering, and nanomaterials. Developing an actin preparation method at the industrial level will help promote its further applications in food science, nutrition, and safety.
Collapse
Affiliation(s)
- Xinyi Tu
- College of Food Science & Nutritional Engineering, China Agricultural University, Beijing Key Laboratory of Functional Food from Plant Resources, Beijing 100083, People's Republic of China
| | - Shuhua Yin
- College of Food Science & Nutritional Engineering, China Agricultural University, Beijing Key Laboratory of Functional Food from Plant Resources, Beijing 100083, People's Republic of China
| | - Jiachen Zang
- College of Food Science & Nutritional Engineering, China Agricultural University, Beijing Key Laboratory of Functional Food from Plant Resources, Beijing 100083, People's Republic of China
| | - Tuo Zhang
- College of Food Science & Nutritional Engineering, China Agricultural University, Beijing Key Laboratory of Functional Food from Plant Resources, Beijing 100083, People's Republic of China
| | - Chenyan Lv
- College of Food Science & Nutritional Engineering, China Agricultural University, Beijing Key Laboratory of Functional Food from Plant Resources, Beijing 100083, People's Republic of China
| | - Guanghua Zhao
- College of Food Science & Nutritional Engineering, China Agricultural University, Beijing Key Laboratory of Functional Food from Plant Resources, Beijing 100083, People's Republic of China
| |
Collapse
|
2
|
Månsson A. The potential of myosin and actin in nanobiotechnology. J Cell Sci 2023; 136:292584. [PMID: 36861886 DOI: 10.1242/jcs.261025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/03/2023] Open
Abstract
Since the late 1990s, efforts have been made to utilize cytoskeletal filaments, propelled by molecular motors, for nanobiotechnological applications, for example, in biosensing and parallel computation. This work has led to in-depth insights into the advantages and challenges of such motor-based systems, and has yielded small-scale, proof-of-principle applications but, to date, no commercially viable devices. Additionally, these studies have also elucidated fundamental motor and filament properties, as well as providing other insights obtained from biophysical assays in which molecular motors and other proteins are immobilized on artificial surfaces. In this Perspective, I discuss the progress towards practically viable applications achieved so far using the myosin II-actin motor-filament system. I also highlight several fundamental pieces of insights derived from the studies. Finally, I consider what may be required to achieve real devices in the future or at least to allow future studies with a satisfactory cost-benefit ratio.
Collapse
Affiliation(s)
- Alf Månsson
- Department of Chemistry and Biomedical Science, Linnaeus University, SE-391 82 Kalmar, Sweden
| |
Collapse
|
3
|
Bassir Kazeruni NM, Rodriguez JB, Saper G, Hess H. Microtubule Detachment in Gliding Motility Assays Limits the Performance of Kinesin-Driven Molecular Shuttles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:7901-7907. [PMID: 32551689 DOI: 10.1021/acs.langmuir.0c01002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The creation of complex active nanosystems integrating cytoskeletal filaments propelled by surface-adhered motor proteins often relies on the filaments' ability to glide over up to meter-long distances. While theoretical considerations support this ability, we show that microtubule detachment (either spontaneous or triggered by a microtubule crossing event) is a non-negligible phenomenon that has been overlooked until now. The average gliding distance before spontaneous detachment was measured to be 30 ± 10 mm for a functional kinesin-1 density of 500 μm-2 and 9 ± 4 mm for a functional kinesin-1 density of 100 μm-2 at 1 mM ATP. Even microtubules longer than 3 μm detached, suggesting that spontaneous detachment is not caused by the stochastic absence of motors or their stochastic release due to a limited run length.
Collapse
Affiliation(s)
- Neda M Bassir Kazeruni
- Columbia University, 351L Engineering Terrace, MC 8904 1210 Amsterdam Avenue, New York, New York 10027, United States
| | - Juan B Rodriguez
- Columbia University, 351L Engineering Terrace, MC 8904 1210 Amsterdam Avenue, New York, New York 10027, United States
| | - Gadiel Saper
- Columbia University, 351L Engineering Terrace, MC 8904 1210 Amsterdam Avenue, New York, New York 10027, United States
| | - Henry Hess
- Columbia University, 351L Engineering Terrace, MC 8904 1210 Amsterdam Avenue, New York, New York 10027, United States
| |
Collapse
|
4
|
Rahman MA, Reuther C, Lindberg FW, Mengoni M, Salhotra A, Heldt G, Linke H, Diez S, Månsson A. Regeneration of Assembled, Molecular-Motor-Based Bionanodevices. NANO LETTERS 2019; 19:7155-7163. [PMID: 31512480 DOI: 10.1021/acs.nanolett.9b02738] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The guided gliding of cytoskeletal filaments, driven by biomolecular motors on nano/microstructured chips, enables novel applications in biosensing and biocomputation. However, expensive and time-consuming chip production hampers the developments. It is therefore important to establish protocols to regenerate the chips, preferably without the need to dismantle the assembled microfluidic devices which contain the structured chips. We here describe a novel method toward this end. Specifically, we use the small, nonselective proteolytic enzyme, proteinase K to cleave all surface-adsorbed proteins, including myosin and kinesin motors. Subsequently, we apply a detergent (5% SDS or 0.05% Triton X100) to remove the protein remnants. After this procedure, fresh motor proteins and filaments can be added for new experiments. Both, silanized glass surfaces for actin-myosin motility and pure glass surfaces for microtubule-kinesin motility were repeatedly regenerated using this approach. Moreover, we demonstrate the applicability of the method for the regeneration of nano/microstructured silicon-based chips with selectively functionalized areas for supporting or suppressing gliding motility for both motor systems. The results substantiate the versatility and a promising broad use of the method for regenerating a wide range of protein-based nano/microdevices.
Collapse
Affiliation(s)
- Mohammad A Rahman
- Department of Chemistry and Biomedical Sciences , Linnaeus University , Kalmar , Sweden , 39182
| | - Cordula Reuther
- B CUBE - Center for Molecular Bioengineering , Technische Universität Dresden , Sachsen , Germany , 01062
- Max Planck Institute of Molecular Cell Biology and Genetics , 01307 Dresden , Germany
| | | | - Martina Mengoni
- B CUBE - Center for Molecular Bioengineering , Technische Universität Dresden , Sachsen , Germany , 01062
- Max Planck Institute of Molecular Cell Biology and Genetics , 01307 Dresden , Germany
| | - Aseem Salhotra
- Department of Chemistry and Biomedical Sciences , Linnaeus University , Kalmar , Sweden , 39182
| | - Georg Heldt
- Fraunhofer Institute for Electronic Nano Systems , Chemnitz , Germany 09126
| | | | - Stefan Diez
- B CUBE - Center for Molecular Bioengineering , Technische Universität Dresden , Sachsen , Germany , 01062
- Max Planck Institute of Molecular Cell Biology and Genetics , 01307 Dresden , Germany
| | - Alf Månsson
- Department of Chemistry and Biomedical Sciences , Linnaeus University , Kalmar , Sweden , 39182
| |
Collapse
|
5
|
Affiliation(s)
- Gadiel Saper
- Department of Biomedical Engineering, Columbia University, New York, New York 10027, United States
| | - Henry Hess
- Department of Biomedical Engineering, Columbia University, New York, New York 10027, United States
| |
Collapse
|
6
|
Rahman MA, Salhotra A, Månsson A. Comparative analysis of widely used methods to remove nonfunctional myosin heads for the in vitro motility assay. J Muscle Res Cell Motil 2019; 39:175-187. [PMID: 30850933 PMCID: PMC6494787 DOI: 10.1007/s10974-019-09505-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Accepted: 02/27/2019] [Indexed: 11/28/2022]
Abstract
The in vitro motility assay allows studies of muscle contraction through observation of actin filament propulsion by surface-adsorbed myosin motors or motor fragments isolated from muscle. A possible problem is that motility may be compromised by nonfunctional, “dead”, motors, obtained in the isolation process. Here we investigate the effects on motile function of two approaches designed to eliminate the effects of these dead motors. We first tested the removal of heavy meromyosin (HMM) molecules with ATP-insensitive “dead” heads by pelleting them with actin filaments, using ultracentrifugation in the presence of 1 mM MgATP (“affinity purification”). Alternatively we incubated motility assay flow cells, after HMM surface adsorption, with non-fluorescent “blocking actin” (1 µM) to block the dead heads. Both affinity purification and use of blocking actin increased the fraction of motile filaments compared to control conditions. However, affinity purification significantly reduced the actin sliding speed in five out of seven experiments on silanized surfaces and in one out of four experiments on nitrocellulose surfaces. Similar effects on velocity were not observed with the use of blocking actin. However, a reduced speed was also seen (without affinity purification) if HMM or myosin subfragment 1 was mixed with 1 mM MgATP before and during surface adsorption. We conclude that affinity purification can produce unexpected effects that may complicate the interpretation of in vitro motility assays and other experiments with surface adsorbed HMM, e.g. single molecule mechanics experiments. The presence of MgATP during incubation with myosin motor fragments is critical for the complicating effects.
Collapse
Affiliation(s)
- Mohammad A Rahman
- Department of Chemistry and Biomedical Sciences, Linnaeus University, Kalmar, 391 82, Sweden
| | - Aseem Salhotra
- Department of Chemistry and Biomedical Sciences, Linnaeus University, Kalmar, 391 82, Sweden
| | - Alf Månsson
- Department of Chemistry and Biomedical Sciences, Linnaeus University, Kalmar, 391 82, Sweden.
| |
Collapse
|
7
|
Keya JJ, Suzuki R, Kabir AMR, Inoue D, Asanuma H, Sada K, Hess H, Kuzuya A, Kakugo A. DNA-assisted swarm control in a biomolecular motor system. Nat Commun 2018; 9:453. [PMID: 29386522 PMCID: PMC5792447 DOI: 10.1038/s41467-017-02778-5] [Citation(s) in RCA: 86] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Accepted: 12/22/2017] [Indexed: 01/10/2023] Open
Abstract
In nature, swarming behavior has evolved repeatedly among motile organisms because it confers a variety of beneficial emergent properties. These include improved information gathering, protection from predators, and resource utilization. Some organisms, e.g., locusts, switch between solitary and swarm behavior in response to external stimuli. Aspects of swarming behavior have been demonstrated for motile supramolecular systems composed of biomolecular motors and cytoskeletal filaments, where cross-linkers induce large scale organization. The capabilities of such supramolecular systems may be further extended if the swarming behavior can be programmed and controlled. Here, we demonstrate that the swarming of DNA-functionalized microtubules (MTs) propelled by surface-adhered kinesin motors can be programmed and reversibly regulated by DNA signals. Emergent swarm behavior, such as translational and circular motion, can be selected by tuning the MT stiffness. Photoresponsive DNA containing azobenzene groups enables switching between solitary and swarm behavior in response to stimulation with visible or ultraviolet light.
Collapse
Affiliation(s)
- Jakia Jannat Keya
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo, 060-0810, Japan
| | - Ryuhei Suzuki
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo, 060-0810, Japan
| | | | - Daisuke Inoue
- Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Hiroyuki Asanuma
- Graduate School of Engineering, Nagoya University, Osaka, 564-8680, Japan
| | - Kazuki Sada
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo, 060-0810, Japan
- Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Henry Hess
- Department of Biomedical Engineering, Columbia University, 1210 Amsterdam Avenue, New York, NY, 10027, USA
| | - Akinori Kuzuya
- Department of Chemistry and Materials Engineering, Kansai University, Osaka, 564-8680, Japan.
| | - Akira Kakugo
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo, 060-0810, Japan.
- Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan.
- Department of Biomedical Engineering, Columbia University, 1210 Amsterdam Avenue, New York, NY, 10027, USA.
| |
Collapse
|
8
|
Chaudhuri S, Korten T, Korten S, Milani G, Lana T, Te Kronnie G, Diez S. Label-Free Detection of Microvesicles and Proteins by the Bundling of Gliding Microtubules. NANO LETTERS 2018; 18:117-123. [PMID: 29202578 DOI: 10.1021/acs.nanolett.7b03619] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Development of miniaturized devices for the rapid and sensitive detection of analyte is crucial for various applications across healthcare, pharmaceutical, environmental, and other industries. Here, we report on the detection of unlabeled analyte by using fluorescently labeled, antibody-conjugated microtubules in a kinesin-1 gliding motility assay. The detection principle is based on the formation of fluorescent supramolecular assemblies of microtubule bundles and spools in the presence of multivalent analytes. We demonstrate the rapid, label-free detection of CD45+ microvesicles derived from leukemia cells. Moreover, we employ our platform for the label-free detection of multivalent proteins at subnanomolar concentrations, as well as for profiling the cross-reactivity between commercially available secondary antibodies. As the detection principle is based on the molecular recognition between antigen and antibody, our method can find general application where it identifies any analyte, including clinically relevant microvesicles and proteins.
Collapse
Affiliation(s)
- Samata Chaudhuri
- B CUBE - Center for Molecular Bioengineering, TU Dresden , 01069 Dresden, Germany
- Max Planck Institute of Molecular Cell Biology and Genetics , 01307 Dresden, Germany
| | - Till Korten
- B CUBE - Center for Molecular Bioengineering, TU Dresden , 01069 Dresden, Germany
- Max Planck Institute of Molecular Cell Biology and Genetics , 01307 Dresden, Germany
| | - Slobodanka Korten
- B CUBE - Center for Molecular Bioengineering, TU Dresden , 01069 Dresden, Germany
- Max Planck Institute of Molecular Cell Biology and Genetics , 01307 Dresden, Germany
| | - Gloria Milani
- Department of Women's and Children's Health, University of Padova , 35128 Padova, Italy
| | - Tobia Lana
- Department of Women's and Children's Health, University of Padova , 35128 Padova, Italy
| | - Geertruy Te Kronnie
- Department of Women's and Children's Health, University of Padova , 35128 Padova, Italy
| | - Stefan Diez
- B CUBE - Center for Molecular Bioengineering, TU Dresden , 01069 Dresden, Germany
- Max Planck Institute of Molecular Cell Biology and Genetics , 01307 Dresden, Germany
| |
Collapse
|
9
|
Zhang W, Chen S, Liu ML. Pathogenic roles of microvesicles in diabetic retinopathy. Acta Pharmacol Sin 2018; 39:1-11. [PMID: 28713160 DOI: 10.1038/aps.2017.77] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2016] [Accepted: 03/23/2017] [Indexed: 02/07/2023] Open
Abstract
Diabetic retinopathy (DR) is a common complication of diabetes and has been recognized as the leading cause of blindness in adults. Several interrelated molecular pathways are involved in the development of DR. Microvesicles (MVs) are cell membrane vesicles, which carry many biologic molecules, such as mRNAs, microRNAs, transcription factors, membrane lipids, membrane receptors, and other proteins. They may be involved in intercellular communication that can promote inflammation, angiogenesis, and coagulation. Recent studies have indicated that changes in the number and composition of MVs may reflect the pathologic conditions of DR. At present, MVs are well recognized as being involved in the pathophysiological conditions of tumors and cardio-metabolic diseases. However, the roles of MVs in DR have yet to be investigated. In this review, we provide an overview of DR-induced microvascular injury that is caused by MVs derived from endothelial and circulating cells, and discuss the possible mechanisms by which MVs can lead to endothelial dysfunction, coagulation and inflammation. In addition, the protective effects of preconditioned MVs and stem cell-derived MVs are also described . Understanding the involvement of MVs in the pathophysiological conditions of DR may provide insight into the disease mechanisms and may suggest novel therapeutic strategies for DR in the future.
Collapse
|
10
|
Kumar S, Mansson A. Covalent and non-covalent chemical engineering of actin for biotechnological applications. Biotechnol Adv 2017; 35:867-888. [PMID: 28830772 DOI: 10.1016/j.biotechadv.2017.08.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2017] [Revised: 08/09/2017] [Accepted: 08/16/2017] [Indexed: 12/26/2022]
Abstract
The cytoskeletal filaments are self-assembled protein polymers with 8-25nm diameters and up to several tens of micrometres length. They have a range of pivotal roles in eukaryotic cells, including transportation of intracellular cargoes (primarily microtubules with dynein and kinesin motors) and cell motility (primarily actin and myosin) where muscle contraction is one example. For two decades, the cytoskeletal filaments and their associated motor systems have been explored for nanotechnological applications including miniaturized sensor systems and lab-on-a-chip devices. Several developments have also revolved around possible exploitation of the filaments alone without their motor partners. Efforts to use the cytoskeletal filaments for applications often require chemical or genetic engineering of the filaments such as specific conjugation with fluorophores, antibodies, oligonucleotides or various macromolecular complexes e.g. nanoparticles. Similar conjugation methods are also instrumental for a range of fundamental biophysical studies. Here we review methods for non-covalent and covalent chemical modifications of actin filaments with focus on critical advantages and challenges of different methods as well as critical steps in the conjugation procedures. We also review potential uses of the engineered actin filaments in nanotechnological applications and in some key fundamental studies of actin and myosin function. Finally, we consider possible future lines of investigation that may be addressed by applying chemical conjugation of actin in new ways.
Collapse
Affiliation(s)
- Saroj Kumar
- Department of Biotechnology, Delhi Technological University, Delhi 110042, India; Department of Chemistry and Biomedical Sciences, Faculty of Health and Life Sciences, Linnaeus University, SE-391 82 Kalmar, Sweden.
| | - Alf Mansson
- Department of Chemistry and Biomedical Sciences, Faculty of Health and Life Sciences, Linnaeus University, SE-391 82 Kalmar, Sweden.
| |
Collapse
|
11
|
Milani G, Lana T, Bresolin S, Aveic S, Pastò A, Frasson C, Te Kronnie G. Expression Profiling of Circulating Microvesicles Reveals Intercellular Transmission of Oncogenic Pathways. Mol Cancer Res 2017; 15:683-695. [PMID: 28202504 DOI: 10.1158/1541-7786.mcr-16-0307] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Revised: 09/26/2016] [Accepted: 02/01/2017] [Indexed: 02/07/2023]
Abstract
Circulating microvesicles have been described as important players in cell-to-cell communication carrying biological information under normal or pathologic condition. Microvesicles released by cancer cells may incorporate diverse biomolecules (e.g., active lipids, proteins, and RNA), which can be delivered and internalized by recipient cells, potentially altering the gene expression of recipient cells and eventually impacting disease progression. Leukemia in vitro model systems were used to investigate microvesicles as vehicles of protein-coding messages. Several leukemic cells (K562, LAMA-87, TOM-1, REH, and SHI-1), each carrying a specific chromosomal translocation, were analyzed. In the leukemic cells, these chromosomal translocations are transcribed into oncogenic fusion transcripts and the transfer of these transcripts was monitored from leukemic cells to microvesicles for each of the cell lines. Microarray gene expression profiling was performed to compare transcriptomes of K562-derived microvesicles and parental K562 cells. The data show that oncogenic BCR-ABL1 transcripts and mRNAs related to basic functions of leukemic cells were included in microvesicles. Further analysis of microvesicles cargo revealed a remarkable enrichment of transcripts related to cell membrane activity, cell surface receptors, and extracellular communication when compared with parental K562 cells. Finally, coculturing of healthy mesenchymal stem cells (MSC) with K562-derived microvesicles displayed the transfer of the oncogenic message, and confirmed the increase of target cell proliferation as a function of microvesicle dosage.Implications: This study provides novel insight into tumor-derived microvesicles as carriers of oncogenic protein-coding messages that can potentially jeopardize cell-directed therapy, and spread to other compartments of the body. Mol Cancer Res; 15(6); 683-95. ©2017 AACR.
Collapse
Affiliation(s)
- Gloria Milani
- Department of Women's and Children's Health, University of Padova, Padova, Italy
| | - Tobia Lana
- Department of Women's and Children's Health, University of Padova, Padova, Italy
| | - Silvia Bresolin
- Department of Women's and Children's Health, University of Padova, Padova, Italy
| | - Sanja Aveic
- Istituto di Ricerca Pediatrica Città della Speranza (IRP), Padova, Italy
| | - Anna Pastò
- Istituto Oncologico Veneto IRCCS, Padova, Italy
| | - Chiara Frasson
- Department of Women's and Children's Health, University of Padova, Padova, Italy.,Istituto di Ricerca Pediatrica Città della Speranza (IRP), Padova, Italy
| | - Geertruy Te Kronnie
- Department of Women's and Children's Health, University of Padova, Padova, Italy.
| |
Collapse
|
12
|
Månsson A. Actomyosin based contraction: one mechanokinetic model from single molecules to muscle? J Muscle Res Cell Motil 2016; 37:181-194. [PMID: 27864648 PMCID: PMC5383694 DOI: 10.1007/s10974-016-9458-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Accepted: 11/09/2016] [Indexed: 12/26/2022]
Abstract
Bridging the gaps between experimental systems on different hierarchical scales is needed to overcome remaining challenges in the understanding of muscle contraction. Here, a mathematical model with well-characterized structural and biochemical actomyosin states is developed to that end. We hypothesize that this model accounts for generation of force and motion from single motor molecules to the large ensembles of muscle. In partial support of this idea, a wide range of contractile phenomena are reproduced without the need to invoke cooperative interactions or ad hoc states/transitions. However, remaining limitations exist, associated with ambiguities in available data for model definition e.g.: (1) the affinity of weakly bound cross-bridges, (2) the characteristics of the cross-bridge elasticity and (3) the exact mechanistic relationship between the force-generating transition and phosphate release in the actomyosin ATPase. Further, the simulated number of attached myosin heads in the in vitro motility assay differs several-fold from duty ratios, (fraction of strongly attached ATPase cycle times) derived in standard analysis. After addressing the mentioned issues the model should be useful in fundamental studies, for engineering of myosin motors as well as for studies of muscle disease and drug development.
Collapse
Affiliation(s)
- Alf Månsson
- Department of Chemistry and Biomedical Sciences, Faculty of Health and Life Sciences, Linnaeus University, 39182, Kalmar, Sweden.
| |
Collapse
|
13
|
Hanson KL, Fulga F, Dobroiu S, Solana G, Kaspar O, Tokarova V, Nicolau DV. Polymer surface properties control the function of heavy meromyosin in dynamic nanodevices. Biosens Bioelectron 2016; 93:305-314. [PMID: 27591903 DOI: 10.1016/j.bios.2016.08.061] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Revised: 08/16/2016] [Accepted: 08/18/2016] [Indexed: 11/30/2022]
Abstract
The actin-myosin system, responsible for muscle contraction, is also the force-generating element in dynamic nanodevices operating with surface-immobilized motor proteins. These devices require materials that are amenable to micro- and nano-fabrication, but also preserve the bioactivity of molecular motors. The complexity of the protein-surface systems is greatly amplified by those of the polymer-fluid interface; and of the structure and function of molecular motors, making the study of these interactions critical to the success of molecular motor-based nanodevices. We measured the density of the adsorbed motor protein (heavy meromyosin, HMM) using quartz crystal microbalance; and motor bioactivity with ATPase assay, on a set of model surfaces, i.e., nitrocellulose, polystyrene, poly(methyl methacrylate), and poly(butyl methacrylate), poly(tert-butyl methacrylate). A higher hydrophobicity of the adsorbing material translates in a higher total number of HMM molecules per unit area, but also in a lower uptake of water, and a lower ratio of active per total HMM molecules per unit area. We also measured the motility characteristics of actin filaments on the model surfaces, i.e., velocity, smoothness and deflection of movement, determined via in vitro motility assays. The filament velocities were found to be controlled by the relative number of active HMM per total motors, rather than their absolute surface density. The study allowed the formulation of the general engineering principles for the selection of polymeric materials for the manufacturing of dynamic nanodevices using protein molecular motors.
Collapse
Affiliation(s)
- Kristi L Hanson
- Industrial Research Institute Swinburne, Swinburne University of Technology, Hawthorn, Victoria, 3122 Australia
| | - Florin Fulga
- Department of Electrical Engineering and Electronics, The University of Liverpool, Liverpool, L693GJ United Kingdom
| | - Serban Dobroiu
- Department of Electrical Engineering and Electronics, The University of Liverpool, Liverpool, L693GJ United Kingdom
| | - Gerardin Solana
- Industrial Research Institute Swinburne, Swinburne University of Technology, Hawthorn, Victoria, 3122 Australia
| | - Ondrej Kaspar
- Department of Bioengineering, McGill University, Montreal, Quebec, H3A0C3 Canada
| | - Viola Tokarova
- Department of Bioengineering, McGill University, Montreal, Quebec, H3A0C3 Canada
| | - Dan V Nicolau
- Industrial Research Institute Swinburne, Swinburne University of Technology, Hawthorn, Victoria, 3122 Australia; Department of Electrical Engineering and Electronics, The University of Liverpool, Liverpool, L693GJ United Kingdom; Department of Bioengineering, McGill University, Montreal, Quebec, H3A0C3 Canada.
| |
Collapse
|