Results 81 to 90 of about 6,904,879 (418)

Membrane mediated aggregation of curvature inducing nematogens and membrane tubulation [PDF]

Biophysical Journal 104, 1-11 (2013), 2013
The shapes of cell membranes are largely regulated by membrane associated, curvature active, proteins. We use a numerical model of the membrane with elongated membrane inclusions, recently developed by us, which posses spontaneous directional curvatures that could be different along and perpendicular to its long axis.
arxiv   +1 more source

Spicules and the effect of rigid rods on enclosing membrane tubes

, 2005
Membrane tubes (spicules) arise in cells, or artificial membranes, in the nonlinear deformation regime due to, e.g. the growth of microtubules, actin filaments or sickle hemoglobin fibers towards a membrane.
B. Alberts, C. S. Peskin, D. Boal, D. Nelson, D. R. Daniels, D. Raucher, M. S. Turner, P. M. Chaikin, S. A. Safran, V. Heinrich, W. Helfrich   +10 more
core   +1 more source

Insertion of the FeB cofactor in cNORs lacking metal inserting chaperones

FEBS Letters, EarlyView.
Nitric oxide reductase is an enzyme found in the bacterial denitrification pathway. The NOR active site contains a non‐heme iron, often, but not always inserted with the assistance of chaperones. Here, we study the insertion of FeB in the subfamily of cNORs lacking chaperones and found a putative channel, conserved in the family, perhaps enabling the ...
Sofia Appelgren, Pia Ädelroth
wiley   +1 more source

Single-cell unroofing: probing topology and nanomechanics of native membranes [PDF]

, 2018
Cell membranes separate the cell interior from the external environment. They are constituted by a variety of lipids; their composition determines the dynamics of membrane proteins and affects the ability of the cells to adapt. Even though the study of model membranes allows to understand the interactions among lipids and the overall mechanics, little ...
arxiv   +1 more source

A Mathematical Model for Predicting the Life of PEM Fuel Cell Membranes Subjected to Hydration Cycling [PDF]

Journal of Power Sources 215 (2012) 135-144, 2013
Under typical PEM fuel cell operating conditions, part of membrane electrode assembly is subjected to humidity cycling due to variation of inlet gas RH and/or flow rate. Cyclic membrane hydration/dehydration would cause cyclic swelling/shrinking of the unconstrained membrane.
arxiv   +1 more source

Tonic inhibition of the chloride/proton antiporter ClC-7 by PI(3,5)P2 is crucial for lysosomal pH maintenance

eLife, 2022
The acidic luminal pH of lysosomes, maintained within a narrow range, is essential for proper degrative function of the organelle and is generated by the action of a V-type H+ ATPase, but other pathways for ion movement are required to dissipate the ...
Xavier Leray, Jacob K Hilton, Kamsi Nwangwu, Alissa Becerril, Vedrana Mikusevic, Gabriel Fitzgerald, Anowarul Amin, Mary R Weston, Joseph A Mindell   +8 more
doaj   +1 more source

Membrane Lipid Composition: Effect on Membrane and Organelle Structure, Function and Compartmentalization and Therapeutic Avenues

International Journal of Molecular Sciences, 2019
Biological membranes are key elements for the maintenance of cell architecture and physiology. Beyond a pure barrier separating the inner space of the cell from the outer, the plasma membrane is a scaffold and player in cell-to-cell communication and the
Doralicia Casares, P. Escribá, C. A. Rosselló   +2 more
semanticscholar   +1 more source

Structural and mechanistic basis for the regulation of the chloroplast signal recognition particle by (p)ppGpp

FEBS Letters, EarlyView.
LHCPs are transported to the thylakoid membrane via the (cp)SRP pathway. This process involves a transit complex of (cp)SRP43, (cp)SRP54 and LHCP, which interacts with (cp)FtsY and Alb3 at the membrane. GTP hydrolysis by (cp)SRP54 and (cp)FtsY triggers complex dissociation.
Victor Zegarra, Paul Weiland, Pauline Anka Plitzko, Julia Thiery, Laura Czech, Felix Willmund, Patricia Bedrunka, Gert Bange   +7 more
wiley   +1 more source

Membrane morphologies induced by arc-shaped scaffolds are determined by arc angle and coverage [PDF]

, 2019
The intricate shapes of biological membranes such as tubules and membrane stacks are induced by proteins. In this article, we systematically investigate the membrane shapes induced by arc-shaped scaffolds such as proteins and protein complexes with coarse-grained modeling and simulations.
arxiv   +1 more source

The model of stress distribution in polymer electrolyte membrane [PDF]

Journal of The Electrochemical Society, 160 (10) F1129-F1137 (2013), 2014
An analytical model of mechanical stress in a polymer electrolyte membrane (PEM) of a hydrogen/air fuel cell with porous Water Transfer Plates (WTP) is developed in this work. The model considers a mechanical stress in the membrane is a result of the cell load cycling under constant oxygen utilization.
arxiv   +1 more source