Membrane ruffling

Membrane ruffling (also known as cell ruffling) is the formation of a motile cell surface that contains a meshwork of newly polymerized actin filaments. It can also be regarded as one of the earliest structural changes observed in the cell. The GTP-binding protein Rac is the regulator of this membrane ruffling. Changes in the Polyphosphoinositide metabolism and changes in Ca2+ level of the cell may also play an important role. A number of actin-binding and organizing proteins localize to membrane ruffles and potentially target to transducing molecules.

Characteristic feature of migrating cells

Membrane ruffling is a characteristic feature of many actively migrating cells. When the membrane is unable to attach to the substrate, the membrane protrusion is recycled back into the cell. The ruffling of membranes is thought to be controlled by a group of enzymes known as Rho GTPases, specifically RhoA, Rac1 and cdc42.

Bacterial infection

Some bacteria such as enteropathogenic E. coli and enterohemorrhagic E. coli can induce membrane ruffling by secreting toxins via the type three secretion system and modifying the host cytoskeleton. Such toxins include EspT, Map, and SopE, which mimic RhoGEF and activate endogenous Rho GTPases to manipulate actin polymerisation in the infected cell.[1]

gollark: Maybe you should find a better geological engineering course somehow.
gollark: The energy requirement scales quadratically, if I remember right.
gollark: Also, I may be missing something, but this "Explosively pumped flux compression generator" is apparently a one-shot device. One which generates a brief pulse of electricity to accelerate your projectile from some chemical energy. Isn't this just an inefficient gun with a bunch of indirection?
gollark: ... a NDA? Is this not just a personal project or something?
gollark: Wait, the test thing is back?

See also

References
  1. Bulgin, Richard; Arbeloa, Ana; Goulding, David; Dougan, Gordon; Crepin, Valerie F.; Raymond, Benoit; Frankel, Gad (11 December 2009). "The T3SS Effector EspT Defines a New Category of Invasive Enteropathogenic E. coli (EPEC) Which Form Intracellular Actin Pedestals". PLOS Pathogens. 5 (12): e1000683. doi:10.1371/journal.ppat.1000683. ISSN 1553-7374. PMC 2782363.


This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.