scholarly journals Collisions of Cortical Microtubules with Membrane Associated Myosin VIII Tail

Cells ◽  
2022 ◽  
Vol 11 (1) ◽  
pp. 145
Author(s):  
Sefi Bar-Sinai ◽  
Eduard Belausov ◽  
Vikas Dwivedi ◽  
Einat Sadot
Keyword(s):  
Plasma Membrane ◽  
Lateral Diffusion ◽  
Elongation Rate ◽  
Cortical Microtubules ◽  
Cluster 2

The distribution of myosin VIII ATM1 tail in association with the plasma membrane is often observed in coordination with that of cortical microtubules (MTs). The prevailing hypothesis is that coordination between the organization of cortical MTs and proteins in the membrane results from the inhibition of free lateral diffusion of the proteins by barriers formed by MTs. Since the positioning of myosin VIII tail in the membrane is relatively stable, we ask: can it affect the organization of MTs? Myosin VIII ATM1 tail co-localized with remorin 6.6, the position of which in the plasma membrane is also relatively stable. Overexpression of myosin VIII ATM1 tail led to a larger fraction of MTs with a lower rate of orientation dispersion. In addition, collisions between MTs and cortical structures labeled by ATM1 tail or remorin 6.6 were observed. Collisions between EB1 labeled MTs and ATM1 tail clusters led to four possible outcomes: 1—Passage of MTs through the cluster; 2—Decreased elongation rate; 3—Disengagement from the membrane followed by a change in direction; and 4—retraction. EB1 tracks became straighter in the presence of ATM1 tail. Taken together, collisions of MTs with ATM1 tail labeled structures can contribute to their coordinated organization.

Lateral Mobility of Integrin αIIbβ3 (Glycoprotein IIb/IIIa) in the Plasma Membrane of a Human Megakaryocyte

1997 ◽  
Vol 77 (01) ◽  
pp. 143-149 ◽  
Author(s):  
Annelies Schootemeijer ◽  
Gijsbert van Willigen ◽  
Hans van der Vuurst ◽  
Leon G J Tertoolen ◽  
Siegfried W De Laat ◽  
...  
Keyword(s):  
Plasma Membrane ◽  
Fluorescence Recovery After Photobleaching ◽  
Cell Activation ◽  
Lateral Diffusion ◽  
Cytochalasin D ◽  
Lag Phase ◽  
Integrin Αiibβ3 ◽  
Cell Matrix ◽  
Cytoplasmic Actin ◽  
Mobile Fraction

SummaryThe migration of integrins to sites of cell-cell and cell-matrix contact is thought to be important for adhesion strengthening. We studied the lateral diffusion of integrin αIIbβ3 (glycoprotein Ilb/IIIa) in the plasma membrane of a cultured human megakaryocyte by fluorescence recovery after photobleaching of FITC-labelled monovalent Fab fragments directed against the P3 subunit. The diffusion of P3 on the unstimulated megakaryocyte showed a lateral diffusion coefficient (D) of 0.37 X10'9 cm2/s and a mobile fraction of about 50%. Stimulation with ADP (20 μM) or α-thrombin (10 U/ml) at 22° C induced transient decreases in both parameters reducing D to 0.21 X 10‘9 cm2/s and the mobile fraction to about 25%. The fall in D was observed within 1 min after stimulation but the fall in mobile fraction showed a lag phase of 5 min. The lag phase was absent in the presence of Calpain I inhibitor, whereas cytochalasin D completely abolished the decrease in mobile fraction. The data are compatible with the concept that cell activation induces anchorage of 50% of the mobile αIIbβ3 (25% of the whole population of receptor) to the cytoplasmic actin filaments, although, as discussed, other rationals are not ruled out.

scholarly journals Lateral diffusion of wild-type and mutant Ld antigens in L cells.

1984 ◽  
Vol 99 (6) ◽  
pp. 2333-2335 ◽  
Author(s):  
M Edidin ◽  
M Zuniga
Keyword(s):  
Plasma Membrane ◽  
Diffusion Coefficients ◽  
Transmembrane Protein ◽  
Transmembrane Proteins ◽  
Lateral Diffusion ◽  
Cytoplasmic Domain ◽  
Histocompatibility Antigen ◽  
Wild Type ◽  
Major Histocompatibility Antigen ◽  
Cytoplasmic Side

We have compared the lateral diffusion of intact transmembrane proteins, wild-type H-2Ld antigens, with that of mutants truncated in the cytoplasmic domain. Diffusion coefficients and mobile fractions were similar for all molecules examined, from wild-type Ld antigens with 31 residues on the cytoplasmic side of the plasma membrane to mutants with only four residues in the cytoplasmic domain. This result limits ways in which the lateral diffusion of a major histocompatibility antigen, a transmembrane protein, can be constrained by interactions with other molecules.

scholarly journals Periprotein lipidomes of Saccharomyces cerevisiae provide a flexible environment for conformational changes of membrane proteins

eLife ◽  
2020 ◽  
Vol 9 ◽  
Author(s):  
Joury S van 't Klooster ◽  
Tan-Yun Cheng ◽  
Hendrik R Sikkema ◽  
Aike Jeucken ◽  
Branch Moody ◽  
...  
Keyword(s):  
Plasma Membrane ◽  
Membrane Proteins ◽  
Small Molecules ◽  
Conformational Changes ◽  
Direct Detection ◽  
Protein Complexes ◽  
Lateral Diffusion ◽  
Low Ph ◽  
Lipid Particles ◽  
High Degree

Yeast tolerates a low pH and high solvent concentrations. The permeability of the plasma membrane (PM) for small molecules is low and lateral diffusion of proteins is slow. These findings suggest a high degree of lipid order, which raises the question of how membrane proteins function in such an environment. The yeast PM is segregated into the Micro-Compartment-of-Can1 (MCC) and Pma1 (MCP), which have different lipid compositions. We extracted proteins from these microdomains via stoichiometric capture of lipids and proteins in styrene-maleic-acid-lipid-particles (SMALPs). We purified SMALP-lipid-protein complexes by chromatography and quantitatively analyzed periprotein lipids located within the diameter defined by one SMALP. Phospholipid and sterol concentrations are similar for MCC and MCP, but sphingolipids are enriched in MCP. Ergosterol is depleted from this periprotein lipidome, whereas phosphatidylserine is enriched relative to the bulk of the plasma membrane. Direct detection of PM lipids in the 'periprotein space' supports the conclusion that proteins function in the presence of a locally disordered lipid state.

scholarly journals AMPA receptors in the synapse turnover by monomer diffusion

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Jyoji Morise ◽  
Kenichi G. N. Suzuki ◽  
Ayaka Kitagawa ◽  
Yoshihiko Wakazono ◽  
Kogo Takamiya ◽  
...  
Keyword(s):  
Endoplasmic Reticulum ◽  
Plasma Membrane ◽  
Synaptic Plasticity ◽  
Learning And Memory ◽  
Ampa Receptors ◽  
Single Molecules ◽  
Lateral Diffusion ◽  
Synaptic Function ◽  
Synaptic Activity ◽  
Monomer Diffusion

AbstractThe number and subunit compositions of AMPA receptors (AMPARs), hetero- or homotetramers composed of four subunits GluA1–4, in the synapse is carefully tuned to sustain basic synaptic activity. This enables stimulation-induced synaptic plasticity, which is central to learning and memory. The AMPAR tetramers have been widely believed to be stable from their formation in the endoplasmic reticulum until their proteolytic decomposition. However, by observing GluA1 and GluA2 at the level of single molecules, we find that the homo- and heterotetramers are metastable, instantaneously falling apart into monomers, dimers, or trimers (in 100 and 200 ms, respectively), which readily form tetramers again. In the dendritic plasma membrane, GluA1 and GluA2 monomers and dimers are far more mobile than tetramers and enter and exit from the synaptic regions. We conclude that AMPAR turnover by lateral diffusion, essential for sustaining synaptic function, is largely done by monomers of AMPAR subunits, rather than preformed tetramers.

scholarly journals A quantitative model of traffic between plasma membrane and secondary lysosomes: evaluation of inflow, lateral diffusion, and degradation.

1988 ◽  
Vol 107 (6) ◽  
pp. 2109-2115 ◽  
Author(s):  
J P Draye ◽  
P J Courtoy ◽  
J Quintart ◽  
P Baudhuin
Keyword(s):  
Plasma Membrane ◽  
Half Life ◽  
Plasma Membranes ◽  
Lateral Diffusion ◽  
Quantitative Model ◽  
Lysosomal Membrane ◽  
Membrane Area ◽  
Rat Fibroblasts ◽  
Secondary Lysosomes ◽  
Total Membrane

We present here a mathematical model that accounts for the various proportions of plasma membrane constituents occurring in the lysosomal membrane of rat fibroblasts (Draye, J.-P., J. Quintart, P. J. Courtoy, and P. Baudhuin. 1987. Eur. J. Biochem. 170: 395-403; Draye, J.-P., P. J. Courtoy, J. Quintart, and P. Baudhuin. 1987. Eur. J. Biochem. 170:405-411). It is based on contents of plasma membrane markers in purified lysosomal preparations, evaluations of their half-life in lysosomes and measurements of areas of lysosomal and plasma membranes by morphometry. In rat fibroblasts, structures labeled by a 2-h uptake of horseradish peroxidase followed by a 16-h chase (i.e., lysosomes) occupy 3% of the cellular volume and their total membrane area corresponds to 30% of the pericellular membrane area. Based on the latter values, the model predicts the rate of inflow and outflow of plasma membrane constituents into lysosomal membrane, provided their rate of degradation is known. Of the bulk of polypeptides iodinated at the cell surface, only 4% reach the lysosomes every hour, where the major part (integral of 83%) is degraded with a half-life in lysosomes of integral to 0.8 h. For specific plasma membrane constituents, this model can further account for differences in the association to the lysosomal membrane by variations in the rate either of lysosomal degradation, of inflow along the pathway from the pericellular membrane to the lysosomes, or of lateral diffusion.

scholarly journals Measuring Lateral Diffusion of Receptors On Plasma Membrane of Macrophages Using Raster Image Correlation Spectroscopy

2018 ◽  
Vol 24 (S1) ◽  
pp. 1356-1357
Author(s):  
S. Makaremi ◽  
S. Ranjit ◽  
M.A. Digman ◽  
E. Gratton ◽  
D. M.E. Bowdish ◽  
...  
Keyword(s):  
Plasma Membrane ◽  
Lateral Diffusion ◽  
Correlation Spectroscopy ◽  
Image Correlation ◽  
Raster Image ◽  
Image Correlation Spectroscopy

scholarly journals Lateral diffusion of the PH-20 protein on guinea pig sperm: evidence that barriers to diffusion maintain plasma membrane domains in mammalian sperm

1987 ◽  
Vol 104 (4) ◽  
pp. 917-923 ◽  
Author(s):  
AE Cowan ◽  
DG Myles ◽  
DE Koppel
Keyword(s):  
Plasma Membrane ◽  
Guinea Pig ◽  
Domain Boundary ◽  
Lateral Diffusion ◽  
Fold Increase ◽  
Membrane Domains ◽  
Mammalian Sperm ◽  
Acrosomal Membrane ◽  
Percent Recovery ◽  
Lipid Probe

PH-20 protein on the plasma membrane (PH-20PM) is restricted to the posterior head of acrosome-intact guinea pig sperm. During the exocytotic acrosome reaction the inner acrosomal membrane (IAM) becomes continuous with the posterior head plasma membrane, and PH-20PM migrates to the IAM. There it joins a second population of PH-20 protein localized to this region of the acrosomal membrane (PH-20AM) (Cowan, A.E., P. Primakoff, and D.G. Myles, 1986, J. Cell Biol. 103:1289-1297). To investigate how the localized distributions of PH-20 protein are maintained, the lateral mobility of PH-20 protein on these different membrane domains was determined using fluorescence redistribution after photobleaching. PH-20PM on the posterior head of acrosome-intact sperm was found to be mobile, with a diffusion coefficient and percent recovery typical of integral membrane proteins (D = 1.8 X 10(-10) cm2/s; %R = 73). This value of D was some 50-fold lower than that found for the lipid probe 1,1-ditetradecyl 3,3,3',3'-tetramethylindocarbocyanine perchlorate (C14diI) in the same region (D = 8.9 X 10(-9) cm2/s). After migration to the IAM of acrosome-reacted sperm, this same population of molecules (PH-20PM) exhibited a 30-fold increase in diffusion rate (D = 4.9 X 10(-9) cm2/s; %R = 78). This rate was similar to diffusion of the lipid probe C14diI in the IAM (D = 5.4 X 10(-9) cm2/s). The finding of free diffusion of PH-20PM in the IAM of acrosome-reacted sperm supports the proposal that PH-20 is maintained within the IAM by a barrier to diffusion at the domain boundary. The slower diffusion of PH-20PM on the posterior head of acrosome-intact sperm is also consistent with localization by barriers to diffusion, but does not rule out alternative mechanisms.

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