1
|
Gao YG, Zhai X, Boldyrev IA, Molotkovsky JG, Patel DJ, Malinina L, Brown RE. Ceramide-1-phosphate transfer protein (CPTP) regulation by phosphoinositides. J Biol Chem 2021; 296:100600. [PMID: 33781749 PMCID: PMC8091061 DOI: 10.1016/j.jbc.2021.100600] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 03/19/2021] [Accepted: 03/25/2021] [Indexed: 12/25/2022] Open
Abstract
Ceramide-1-phosphate transfer proteins (CPTPs) are members of the glycolipid transfer protein (GLTP) superfamily that shuttle ceramide-1-phosphate (C1P) between membranes. CPTPs regulate cellular sphingolipid homeostasis in ways that impact programmed cell death and inflammation. CPTP downregulation specifically alters C1P levels in the plasma and trans-Golgi membranes, stimulating proinflammatory eicosanoid production and autophagy-dependent inflammasome-mediated cytokine release. However, the mechanisms used by CPTP to target the trans-Golgi and plasma membrane are not well understood. Here, we monitored C1P intervesicular transfer using fluorescence energy transfer (FRET) and showed that certain phosphoinositides (phosphatidylinositol 4,5 bisphosphate (PI-(4,5)P2) and phosphatidylinositol 4-phosphate (PI-4P)) increased CPTP transfer activity, whereas others (phosphatidylinositol 3-phosphate (PI-3P) and PI) did not. PIPs that stimulated CPTP did not stimulate GLTP, another superfamily member. Short-chain PI-(4,5)P2, which is soluble and does not remain membrane-embedded, failed to activate CPTP. CPTP stimulation by physiologically relevant PI-(4,5)P2 levels surpassed that of phosphatidylserine (PS), the only known non-PIP stimulator of CPTP, despite PI-(4,5)P2 increasing membrane equilibrium binding affinity less effectively than PS. Functional mapping of mutations that led to altered FRET lipid transfer and assessment of CPTP membrane interaction by surface plasmon resonance indicated that di-arginine motifs located in the α-6 helix and the α3-α4 helix regulatory loop of the membrane-interaction region serve as PI-(4,5)P2 headgroup-specific interaction sites. Haddock modeling revealed specific interactions involving the PI-(4,5)P2 headgroup that left the acyl chains oriented favorably for membrane embedding. We propose that PI-(4,5)P2 interaction sites enhance CPTP activity by serving as preferred membrane targeting/docking sites that favorably orient the protein for function.
Collapse
Affiliation(s)
- Yong-Guang Gao
- Hormel Institute, University of Minnesota, Austin, Minnesota, USA
| | - Xiuhong Zhai
- Hormel Institute, University of Minnesota, Austin, Minnesota, USA
| | - Ivan A Boldyrev
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation
| | - Julian G Molotkovsky
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation
| | - Dinshaw J Patel
- Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, New York, USA
| | - Lucy Malinina
- Hormel Institute, University of Minnesota, Austin, Minnesota, USA
| | | |
Collapse
|
2
|
Gao YG, My Le LT, Zhai X, Boldyrev IA, Mishra SK, Tischer A, Murayama T, Nishida A, Molotkovsky JG, Alam A, Brown RE. Measuring Lipid Transfer Protein Activity Using Bicelle-Dilution Model Membranes. Anal Chem 2020; 92:3417-3425. [PMID: 31970977 DOI: 10.1021/acs.analchem.9b05523] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
In vitro assessment of lipid intermembrane transfer activity by cellular proteins typically involves measurement of either radiolabeled or fluorescently labeled lipid trafficking between vesicle model membranes. Use of bilayer vesicles in lipid transfer assays usually comes with inherent challenges because of complexities associated with the preparation of vesicles and their rather short "shelf life". Such issues necessitate the laborious task of fresh vesicle preparation to achieve lipid transfer assays of high quality, precision, and reproducibility. To overcome these limitations, we have assessed model membrane generation by bicelle dilution for monitoring the transfer rates and specificity of various BODIPY-labeled sphingolipids by different glycolipid transfer protein (GLTP) superfamily members using a sensitive fluorescence resonance energy transfer approach. Robust, protein-selective sphingolipid transfer is observed using donor and acceptor model membranes generated by dilution of 0.5 q-value mixtures. The sphingolipid transfer rates are comparable to those observed between small bilayer vesicles produced by sonication or ethanol injection. Among the notable advantages of using bicelle-generated model membranes are (i) easy and straightforward preparation by means that avoid lipid fluorophore degradation and (ii) long "shelf life" after production (≥6 days) and resilience to freeze-thaw storage. The bicelle-dilution-based assay is sufficiently robust, sensitive, and stable for application, not only to purified LTPs but also for LTP activity detection in crude cytosolic fractions of cell homogenates.
Collapse
Affiliation(s)
- Yong-Guang Gao
- The Hormel Institute , University of Minnesota , 801 16th Avenue NE , Austin , Minnesota 55912 , United States
| | - Le Thi My Le
- The Hormel Institute , University of Minnesota , 801 16th Avenue NE , Austin , Minnesota 55912 , United States
| | - Xiuhong Zhai
- The Hormel Institute , University of Minnesota , 801 16th Avenue NE , Austin , Minnesota 55912 , United States
| | - Ivan A Boldyrev
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry , Russian Academy of Sciences , 117997 Moscow , Russian Federation
| | - Shrawan K Mishra
- The Hormel Institute , University of Minnesota , 801 16th Avenue NE , Austin , Minnesota 55912 , United States
| | - Alexander Tischer
- Mayo Clinic Division of Hematology , 150 Third Street SW , Stabile Building, Rochester , Minnesota 55905 , United States
| | - Toshihiko Murayama
- Graduate School of Pharmaceutical Sciences , Chiba University , Inohana 1-8-1 , Chuo-ku, Chiba 260-8675 , Japan
| | - Atsushi Nishida
- Graduate School of Pharmaceutical Sciences , Chiba University , Inohana 1-8-1 , Chuo-ku, Chiba 260-8675 , Japan
| | - Julian G Molotkovsky
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry , Russian Academy of Sciences , 117997 Moscow , Russian Federation
| | - Amer Alam
- The Hormel Institute , University of Minnesota , 801 16th Avenue NE , Austin , Minnesota 55912 , United States
| | - Rhoderick E Brown
- The Hormel Institute , University of Minnesota , 801 16th Avenue NE , Austin , Minnesota 55912 , United States
| |
Collapse
|
3
|
In Vitro Measurement of Sphingolipid Intermembrane Transport Illustrated by GLTP Superfamily Members. Methods Mol Biol 2019; 1949:237-256. [PMID: 30790260 DOI: 10.1007/978-1-4939-9136-5_17] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Herein, we describe methodological approaches for measuring in vitro transfer of sphingolipids (SLs) between membranes. The approaches rely on direct tracking of the lipid. Typically, direct tracking involves lipid labeling via attachment of fluorophores or introduction of radioactivity. Members of the GlycoLipid Transfer Protein (GLTP) superfamily are used to illustrate two broadly applicable methods for direct lipid tracking. One method relies on Förster resonance energy transfer (FRET) that enables continuous assessment of fluorophore-labeled SL transfer in real time between lipid donor and acceptor vesicles. The second method relies on tracking of radiolabeled SL transfer by separation of lipid donor and acceptor vesicles at discrete time points. The assays are readily adjustable for assessing lipid transfer (1) between various model membrane assemblies (vesicles, micelles, bicelles, nanodiscs), (2) involving other lipid types by other lipid transfer proteins, (3) with protein preparations that are either crudely or highly purified, and (4) that is spontaneous and occurs in the absence of protein.
Collapse
|
4
|
Zhai X, Gao YG, Mishra SK, Simanshu DK, Boldyrev IA, Benson LM, Bergen HR, Malinina L, Mundy J, Molotkovsky JG, Patel DJ, Brown RE. Phosphatidylserine Stimulates Ceramide 1-Phosphate (C1P) Intermembrane Transfer by C1P Transfer Proteins. J Biol Chem 2016; 292:2531-2541. [PMID: 28011644 DOI: 10.1074/jbc.m116.760256] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Revised: 12/21/2016] [Indexed: 11/06/2022] Open
Abstract
Genetic models for studying localized cell suicide that halt the spread of pathogen infection and immune response activation in plants include Arabidopsis accelerated-cell-death 11 mutant (acd11). In this mutant, sphingolipid homeostasis is disrupted via depletion of ACD11, a lipid transfer protein that is specific for ceramide 1-phosphate (C1P) and phyto-C1P. The C1P binding site in ACD11 and in human ceramide-1-phosphate transfer protein (CPTP) is surrounded by cationic residues. Here, we investigated the functional regulation of ACD11 and CPTP by anionic phosphoglycerides and found that 1-palmitoyl-2-oleoyl-phosphatidic acid or 1-palmitoyl-2-oleoyl-phosphatidylglycerol (≤15 mol %) in C1P source vesicles depressed C1P intermembrane transfer. By contrast, replacement with 1-palmitoyl-2-oleoyl-phosphatidylserine stimulated C1P transfer by ACD11 and CPTP. Notably, "soluble" phosphatidylserine (dihexanoyl-phosphatidylserine) failed to stimulate C1P transfer. Also, none of the anionic phosphoglycerides affected transfer action by human glycolipid lipid transfer protein (GLTP), which is glycolipid-specific and has few cationic residues near its glycolipid binding site. These findings provide the first evidence for a potential phosphoglyceride headgroup-specific regulatory interaction site(s) existing on the surface of any GLTP-fold and delineate new differences between GLTP superfamily members that are specific for C1P versus glycolipid.
Collapse
Affiliation(s)
- Xiuhong Zhai
- From the Hormel Institute, University of Minnesota, Austin, Minnesota 55912,
| | - Yong-Guang Gao
- From the Hormel Institute, University of Minnesota, Austin, Minnesota 55912
| | - Shrawan K Mishra
- From the Hormel Institute, University of Minnesota, Austin, Minnesota 55912
| | - Dhirendra K Simanshu
- the Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10065
| | - Ivan A Boldyrev
- the Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 117997 Moscow, Russia
| | - Linda M Benson
- the Medical Genomic Facility-Proteomics Core, Mayo Foundation, Rochester, Minnesota 55905, and
| | - H Robert Bergen
- the Medical Genomic Facility-Proteomics Core, Mayo Foundation, Rochester, Minnesota 55905, and
| | - Lucy Malinina
- From the Hormel Institute, University of Minnesota, Austin, Minnesota 55912
| | - John Mundy
- the Department of Biology, BioCenter, University of Copenhagen, DK-2200 Copenhagen N, Denmark
| | - Julian G Molotkovsky
- the Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 117997 Moscow, Russia
| | - Dinshaw J Patel
- the Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10065
| | - Rhoderick E Brown
- From the Hormel Institute, University of Minnesota, Austin, Minnesota 55912,
| |
Collapse
|
5
|
Vonmont-Bachmann PA, Walde P, Luisi PL. Lipase-catalyzed reactions in vesicles as an approach to vesicle self-reproduction. J Liposome Res 2008; 4:1135-1158. [DOI: 10.3109/08982109409018626] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
| | - Peter Walde
- Institut für Polymere, ETH-Zentrum, Universitätstrasse 6, CH-8092, Zurich, Switzerland
| | - Pier Luigi Luisi
- Institut für Polymere, ETH-Zentrum, Universitätstrasse 6, CH-8092, Zurich, Switzerland
| |
Collapse
|
6
|
Rao CS, Lin X, Pike HM, Molotkovsky JG, Brown RE. Glycolipid transfer protein mediated transfer of glycosphingolipids between membranes: a model for action based on kinetic and thermodynamic analyses. Biochemistry 2004; 43:13805-15. [PMID: 15504043 PMCID: PMC2596630 DOI: 10.1021/bi0492197] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Glycolipid transfer protein (GLTP) catalyzes the intermembrane transfer of lipids that have sugars beta-linked to either diacylglycerol or ceramide backbones, including simple glycosphingolipids (GSLs) and gangliosides. The present study provides a quantitative understanding of GLTP action involving bilayer vesicles that have high and low curvature stress, i.e., small and large unilamellar vesicles (SUVs and LUVs). When the GSL intervesicular transfer was monitored in real time using an established fluorescence resonance energy approach, the initial GSL transfer rates (v(0)) and net transfer equilibrium (K(eq)) were determined for GLTP-mediated transfer from SUVs and LUVs over the temperature range of 30-44 degrees C. v(0) exhibited a linear dependence with respect to varying GLTP concentrations (0-143 nM range) in SUVs and LUVs, suggesting a first order dependence on the GLTP bulk concentration. Thermodynamic parameters associated with the GLTP-GSL transition-state complex and GSL net transfer were determined from linear Arrhenius and van't Hoff plots, respectively. Although initial transfer rates were lower for LUVs than for SUVs, the activation energy barriers were higher for LUVs, while the Gibbs's free energy of the transition states were similar. The formation of a transition-state complex was predominantly enthalpy driven, whereas the net transfer of GSLs was mainly entropy driven. The rate-limiting step for GLTP action appeared to be the surface processes leading to the GLTP-GSL complex formation and release associated with a shuttle/carrier mode of action. Because surface processes leading to the GLTP-GSL complex formation were limiting for GLTP action with SUVs and LUVs, it was concluded that GLTP is likely to be a valuable tool to probe and manipulate GSL environments in membranes.
Collapse
Affiliation(s)
- Chetan S Rao
- The Hormel Institute, University of Minnesota, 801 16th Avenue Northeast, Austin, Minnesota 55912-3698, USA.
| | | | | | | | | |
Collapse
|
7
|
Mattjus P, Turcq B, Pike HM, Molotkovsky JG, Brown RE. Glycolipid intermembrane transfer is accelerated by HET-C2, a filamentous fungus gene product involved in the cell-cell incompatibility response. Biochemistry 2003; 42:535-42. [PMID: 12525182 PMCID: PMC2593802 DOI: 10.1021/bi026896x] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Among filamentous fungi capable of mycelial growth, het genes play crucial roles by regulating heterokaryon formation between different individuals. When fusion occurs between fungal mycelia that differ genetically at their het loci, the resulting heterokaryotic cells are quickly destroyed. It is unclear how het gene products of Podospora anserina trigger heterokaryon incompatibility. One unexplored possibility is that glycosphingolipids play a role because the het-c2 gene encodes a protein that displays 32% sequence identity and an additional 30% similarity to the mammalian glycolipid transfer protein. Here, P. anserina protoplasts containing wild-type het-c2 genes were shown to have greater glycosphingolipid transfer activity than protoplasts with disrupted het-c2 genes, a condition previously linked to altered cell compatibility following hyphal fusion. The observed glycolipid transfer activity could not be accounted for by nonspecific lipid transfer protein activity. Direct assessment showed that purified, recombinant HET-C2 accelerates the intermembrane transfer of glycolipid in vitro, but that the HET-C2 activity is mitigated much less by negatively charged membranes than the mammalian glycolipid transfer protein. The findings are discussed within the context of HET-C2 being a member of an emerging family of ancestral sphingolipid transfer proteins that play important roles in cell proliferation and accelerated death.
Collapse
Affiliation(s)
- Peter Mattjus
- The Hormel Institute, University of Minnesota, 801 16th Avenue NE Austin, Minnesota 55912, USA.
| | | | | | | | | |
Collapse
|
8
|
Ghidoni R, Sala G, Giuliani A. Use of sphingolipid analogs: benefits and risks. BIOCHIMICA ET BIOPHYSICA ACTA 1999; 1439:17-39. [PMID: 10395962 DOI: 10.1016/s1388-1981(99)00074-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- R Ghidoni
- INSERM U410, Neuroendocrinologie et Biologie Cellulaire Digestives, Faculté de Médecine Xavier Bichat, Paris, France.
| | | | | |
Collapse
|
9
|
Engelmann B, Kögl C, Kulschar R, Schaipp B. Transfer of phosphatidylcholine, phosphatidylethanolamine and sphingomyelin from low- and high-density lipoprotein to human platelets. Biochem J 1996; 315 ( Pt 3):781-9. [PMID: 8645158 PMCID: PMC1217275 DOI: 10.1042/bj3150781] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Following a 1 h incubation of human platelets with low-density lipoprotein (LDL) labelled in the apoprotein fraction (125I-apoB) or in phospholipid fractions [14C-labelled phosphatidylcholine (PC), phosphatidylethanolamine (PE) or sphingomyelin (SM)], the percentage of total 14C associated with the cells was about 3-fold higher than the percentage of 125I. Differences in temperature sensitivity also indicated differential interactions of phospholipids and apoprotein with platelets. In order to assess the amount of [14C]phospholipid transferred from LDL or high-density lipoprotein (HDL) to the cells, the quantity of bound lipoproteins was estimated by adding an excess of unlabelled lipoprotein, or by selectively degrading LDL- and HDL-associated [14C]PC and [14C]PE with phospholipase C. Incubation of platelets with LDL or HDL containing pyrenedecanoic acid-labelled PC or SM (py-PC, py-SM) increased pyrene monomer fluorescence, indicating incorporation of the phospholipids into platelets. With HDl as donor, incorporation of py-SM was greater than uptake of py-PC. Pretreating platelets with elastase dose-dependently inhibited uptake of py-SM and py-PC. Treatment of cells with phospholipase C indicated that the uptake of [14C]PC by platelets, and not the binding of lipoproteins to the cells, was partially inhibited by elastase. In conclusion, LDL and HDL rapidly deliver SM, PC and PE to platelets. Incorporation of LDL-derived phospholipids into platelets is unlikely to be mediated by endocytosis of lipoprotein particles. The uptake of the two choline-containing phospholipids appears to require the presence of specialized platelet membrane protein(s).
Collapse
Affiliation(s)
- B Engelmann
- Physiologisches Institut, Universität München, Germany
| | | | | | | |
Collapse
|
10
|
Affiliation(s)
- U Muller-Eberhard
- Department of Pediatrics/Hematology-Oncology, Cornell University Medical College, New York, NY 10021
| | | |
Collapse
|