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Cino EA, Tieleman DP. Curvature-based sorting of eight lipid types in asymmetric buckled plasma membrane models. Biophys J 2022; 121:2060-2068. [PMID: 35524412 DOI: 10.1016/j.bpj.2022.05.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 04/13/2022] [Accepted: 05/02/2022] [Indexed: 11/02/2022] Open
Abstract
Curvature is a fundamental property of biological membranes and has essential roles in cellular function. Bending of membranes can be induced by their lipid and protein compositions, as well as peripheral proteins, such as those that make up the cytoskeleton. An important aspect of membrane function is the grouping of lipid species into microdomains, or rafts, which serve as platforms for specific biochemical processes. The fluid mosaic model of membranes has evolved to recognize the importance of curvature and leaflet asymmetry, and there are efforts towards evaluating their functional roles. This work investigates the effect of curvature on the sorting of lipids in buckled asymmetric bilayers containing eight lipid types, approximating an average mammalian plasma membrane, through coarse-grained (CG) molecular dynamics (MD) simulations with the Martini force field. The simulations reveal that i) leaflet compositional asymmetry can induce curvature asymmetry, ii) lipids are sorted by curvature to different extents, and iii) curvature-based partitioning trends show moderate to strong correlations with lipid molecular volumes and head to tail bead ratios, respectively. The findings provide unique insights into the role of curvature in membrane organization, and the curvature-based sorting trends should be useful references for later investigations, and potentially interpreting the functional roles of specific lipids.
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Affiliation(s)
- Elio A Cino
- Centre for Molecular Simulation and Department of Biological Sciences, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
| | - D Peter Tieleman
- Centre for Molecular Simulation and Department of Biological Sciences, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada.
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Wang H, Wang Z, Liu Z, Wang K, Xu W. Membrane disruption of Fusarium oxysporum f. sp. niveum induced by myriocin from Bacillus amyloliquefaciens LZN01. Microb Biotechnol 2021; 14:517-534. [PMID: 32954686 PMCID: PMC7936314 DOI: 10.1111/1751-7915.13659] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 08/10/2020] [Accepted: 08/14/2020] [Indexed: 12/28/2022] Open
Abstract
Myriocin, which is produced by Bacillus amyloliquefaciens LZN01, can inhibit the growth of Fusarium oxysporum f. sp. niveum (Fon). In the present study, the antifungal mechanism of myriocin against Fon was investigated with a focus on the effects of myriocin on the cell membrane. Myriocin decreased the membrane fluidity and destroyed the membrane integrity of Fon. Significant microscopic morphological changes, including conidial shrinkage, the appearance of larger vacuoles and inhomogeneity of electron density, were observed in myriocin-treated cells. A membrane-targeted mechanism of action was also supported by transcriptomic and proteomic analyses; a total of 560 common differentially expressed genes (DEGs) and 285 common differentially expressed proteins (DEPs) were identified. The DEGs were further verified by using RT-qPCR. The combined analysis between the transcriptome and proteome revealed that the expression of some membrane-related genes and proteins, mainly those related to sphingolipid metabolism, glycerophospholipid metabolism, steroid biosynthesis, ABC transporters and protein processing in the endoplasmic reticulum, was disordered. Myriocin affected the serine palmitoyl transferase (SPT) activity as evidenced through molecular docking. Our results indicate that myriocin has significant antifungal activity owing to its ability to induce membrane damage in Fon.
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Affiliation(s)
- Hengxu Wang
- College of Life Science and AgroforestryQiqihar UniversityQiqihar161006China
- Key Laboratory of Urban AgricultureMinistry of Agriculture and Rural AffairsShanghai200240China
- Heilongjiang Provincial Technology Innovation Center of Agromicrobial Preparation IndustrializationQiqihar161006China
| | - Zhigang Wang
- College of Life Science and AgroforestryQiqihar UniversityQiqihar161006China
- Key Laboratory of Urban AgricultureMinistry of Agriculture and Rural AffairsShanghai200240China
- Heilongjiang Provincial Technology Innovation Center of Agromicrobial Preparation IndustrializationQiqihar161006China
| | - Zeping Liu
- College of Life Science and AgroforestryQiqihar UniversityQiqihar161006China
- Heilongjiang Provincial Technology Innovation Center of Agromicrobial Preparation IndustrializationQiqihar161006China
| | - Kexin Wang
- College of Life Science and AgroforestryQiqihar UniversityQiqihar161006China
- Heilongjiang Provincial Technology Innovation Center of Agromicrobial Preparation IndustrializationQiqihar161006China
| | - Weihui Xu
- College of Life Science and AgroforestryQiqihar UniversityQiqihar161006China
- Key Laboratory of Urban AgricultureMinistry of Agriculture and Rural AffairsShanghai200240China
- Heilongjiang Provincial Technology Innovation Center of Agromicrobial Preparation IndustrializationQiqihar161006China
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Using Phosphatidylinositol Phosphorylation as Markers for Hyperglycemic Related Breast Cancer. Int J Mol Sci 2020; 21:ijms21072320. [PMID: 32230859 PMCID: PMC7177416 DOI: 10.3390/ijms21072320] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2020] [Revised: 03/23/2020] [Accepted: 03/25/2020] [Indexed: 02/06/2023] Open
Abstract
Studies have suggested that type 2 diabetes (T2D) is associated with a higher incidence of breast cancer and related mortality rates. T2D postmenopausal women have an ~20% increased chance of developing breast cancer, and women with T2D and breast cancer have a 50% increase in mortality compared to breast cancer patients without diabetes. This correlation has been attributed to the general activation of insulin receptor signaling, glucose metabolism, phosphatidylinositol (PI) kinases, and growth pathways. Furthermore, the presence of breast cancer specific PI kinase and/or phosphatase mutations enhance metastatic breast cancer phenotypes. We hypothesized that each of the breast cancer subtypes may have characteristic PI phosphorylation profiles that are changed in T2D conditions. Therefore, we sought to characterize the PI phosphorylation when equilibrated in normal glycemic versus hyperglycemic serum conditions. Our results suggest that hyperglycemia leads to: 1) A reduction in PI3P and PIP3, with increased PI4P that is later converted to PI(3,4)P2 at the cell surface in hormone receptor positive breast cancer; 2) a reduction in PI3P and PI4P with increased PIP3 surface expression in human epidermal growth factor receptor 2-positive (HER2+) breast cancer; and 3) an increase in di- and tri-phosphorylated PIs due to turnover of PI3P in triple negative breast cancer. This study begins to describe some of the crucial changes in PIs that play a role in T2D related breast cancer incidence and metastasis.
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Hall L, Donovan E, Araya M, Idowa E, Jiminez-Segovia I, Folck A, Wells CD, Kimble-Hill AC. Identification of Specific Lysines and Arginines That Mediate Angiomotin Membrane Association. ACS OMEGA 2019; 4:6726-6736. [PMID: 31179409 PMCID: PMC6547806 DOI: 10.1021/acsomega.9b00165] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Accepted: 03/28/2019] [Indexed: 05/17/2023]
Abstract
The family of Angiomotin (Amot) proteins regulate several biological pathways associated with cellular differentiation, proliferation, and migration. These adaptor proteins target proteins to the apical membrane, actin fibers, or the nucleus. A major function of the Amot coiled-coil homology (ACCH) domain is to initiate protein interactions with the cellular membrane, particularly those containing phosphatidylinositol lipids. The work presented in this article uses several ACCH domain lysine/arginine mutants to probe the relative importance of individual residues for lipid binding. This identified four lysine and three arginine residues that mediate full lipid binding. Based on these findings, three of these residues were mutated to glutamates in the Angiomotin 80 kDa splice form and were incorporated into human mammary cell lines. Results show that mutating three of these residues in the context of full-length Angiomotin reduced the residence of the protein at the apical membrane. These findings provide new insight into how the ACCH domain mediates lipid binding to enable Amot proteins to control epithelial cell growth.
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Affiliation(s)
- Le’Celia Hall
- Department of Biochemistry
and Molecular Biology, Indiana University
School of Medicine, Room MS 4053, 635 Barnhill Drive, Indianapolis, Indiana 46202, United
States
| | - Emily Donovan
- Department of Biochemistry
and Molecular Biology, Indiana University
School of Medicine, Room MS 4053, 635 Barnhill Drive, Indianapolis, Indiana 46202, United
States
| | - Michael Araya
- Department of Biochemistry
and Molecular Biology, Indiana University
School of Medicine, Room MS 4053, 635 Barnhill Drive, Indianapolis, Indiana 46202, United
States
| | - Eniola Idowa
- Department of Biochemistry
and Molecular Biology, Indiana University
School of Medicine, Room MS 4053, 635 Barnhill Drive, Indianapolis, Indiana 46202, United
States
| | - Ilse Jiminez-Segovia
- Department of Biochemistry
and Molecular Biology, Indiana University
School of Medicine, Room MS 4053, 635 Barnhill Drive, Indianapolis, Indiana 46202, United
States
| | - Anthony Folck
- Department of Biochemistry
and Molecular Biology, Indiana University
School of Medicine, Room MS 4053, 635 Barnhill Drive, Indianapolis, Indiana 46202, United
States
| | - Clark D. Wells
- Department of Biochemistry
and Molecular Biology, Indiana University
School of Medicine, Room MS 4053, 635 Barnhill Drive, Indianapolis, Indiana 46202, United
States
| | - Ann C. Kimble-Hill
- Department of Biochemistry
and Molecular Biology, Indiana University
School of Medicine, Room MS 4053, 635 Barnhill Drive, Indianapolis, Indiana 46202, United
States
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