motor proteins


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motor proteins

The protein classes of myosins, kinesins and dyneins. Also known as molecular motors. There are more than 40 myosins, they function in muscle contraction and some other processes, and move along filaments of the protein actin. Kinesins are concerned in transport of proteins, organelles and vesicles along microtubules and chromosome segregation. Dyneins are very large molecules that power cilia and flagella. All the motor proteins are powered by energy from ATP binding, hydrolysis and release. Molecular proteins convert chemical energy (ATP) into kinetic energy.
References in periodicals archive ?
The spindle matrix protein NuMA, the centrosomal protein 4D2, and the spindle motor proteins Kif2, KR[P.
The findings involve a class of DNA motor proteins called helicases.
These include (1) the shuttling of electrons and protons across the inner fatty zones of bacterial cellular membranes by quinone molecules, a key step in the cells' energy-generating process; (2) the rotary action of several enzyme complexes; and (3) the movement along a track by certain motor proteins, especially the kinesins.
They are driven along the tracks by the molecular motor proteins kinesin and dynein, assisted by ancillary proteins such as tau.
To establish and maintain such a highly complex organisation, cytoskeletal motor proteins transport basic building blocks to either axons or dendrites.
Having created a gel that can replicate contractions, Saleh and Fygenson are now looking to refine their technique and enable distinct movements, such as twisting and crawling, or using other motor proteins that would allow the gel to mimic other cell behaviors, such as shape-shifting and dividing.
Coating those lines with so-called motor proteins made microtubules scurry along the ridges.
Research into the activity of key motor proteins suggests that a unique form of random motion powered by thermal energy may play a vital role in moving enzymes and other chemicals inside cells.
Locomotion in this system is generated by the vectorial assembly of MSP filaments and their bundling into macrofibers, and motor proteins do not appear to play a major role (Roberts and Stewart, 1997).
After initial formation transport vesicles are separated from their donor membrane and this fission event seems to be coordinated with the elongation of tubular precursors pulled by motor proteins.
Nature does the same thing; in cells, so-called motor proteins -- such as kinesin and the muscle protein actin -- carry out this task.
We added crude preparations of brain MT-associated proteins (MAPs) or MT motor proteins to MTs composed of a mixture of detyrosinated and tyrosinated tubulin, together with saturating levels of antibody to either detyrosinated or tyrosinated tubulin.