from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The commonest protein in muscle cells, responsible for the elastic and contractile properties of muscle. It combines with actin to form actomyosin.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A large family of motor proteins found in eukaryotic tissues, allowing mobility in muscles.
from the GNU version of the Collaborative International Dictionary of English
- n. A protein present in muscle, serving as the principle contractile protein in muscle contraction.
from The Century Dictionary and Cyclopedia
- n. A globulin, the chief ingredient which separates from muscle-plasma on coagulation.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the commonest protein in muscle; a globulin that combines with actin to form actomyosin
The motor protein myosin, for example, is involved in the the contraction of muscle fibers in animals.
Every technical explanation in the literature (that iv'e seen) as to why myosin is a motor referrs to the actual definition of a motor.
When myosin is activated, the contractile filaments slide apart and the muscle cell relaxes.
However, dendritic proteins enable the vesicles transporting them to bind to a second motor, known as myosin, that literally walks them back into the dendrite.
Write "linear motor" on the A column and "myosin" on the B column.
Until recently, scientists thought RGS proteins, which are found only in small quantities in the heart -- a thousand times less than other, more common proteins, such as myosin and metabolic proteins -- played no key role in heart function.
: Regional alterations in the expression of smooth muscle myosin isoforms in response to partial bladder outlet obstruction.
Wu HY, Zderic SA, Wein AJ, Chacko S: Decrease in maximal force generation in the neonatal mouse bladder corresponds to shift in myosin heavy chain isoform composition.
Austin JC, Chacko SK, DiSanto M, Canning DA, Zderic SA: A male murine model of partial bladder outlet obstruction reveals changes in detrusor morphology, contractility and myosin isoform expression.
As the structural and thermodynamic data about ATP mounted, combined with the enzymatic information and the discovery of myosin, Meyerhof was finally in a position to formally propose that the release of energy in ATP hydrolysis was the primary event leading to muscle contraction and that lactic acid and creatine phosphate were only indirectly involved through their role of maintaining the ATP cycle.
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