Plus-end directed myosins accelerate actin filament sliding by single-headed myosin VI. 2012

Bhagavathi Ramamurthy, and Wenxiang Cao, and Enrique M De la Cruz, and Mark S Mooseker
Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, Connecticut 06520-8103, USA.

Myosin VI (Myo6) is unique among myosins in that it moves toward the minus (pointed) end of the actin filament. Thus to exert tension on, or move cargo along an actin filament, Myo6 is working against potentially multiple plus (barbed)-end myosins. To test the effect of plus-end motors on Myo6, the gliding actin filament assay was used to assess the motility of single-headed Myo6 in the absence and presence of cardiac myosin II (Myo2) and myosin Va (Myo5a). Myo6 alone exhibited a filament gliding velocities of 60.34 ± 13.68 nm/s. Addition of either Myo2 or Myo5a, at densities below that required to promote plus-end movement resulted in an increase in Myo6 velocity (~100-150% increase). Movement in the presence of these plus-end myosins was minus-end directed as determined using polarity tagged filaments. High densities of Myo2 or Myo5a were required to convert to plus-end directed motility indicating that Myo6 is a potent inhibitor of Myo2 and Myo5a. Previous studies have shown that two-headed Myo6 slows and then stalls in an anchored state under load. Consistent with these studies, velocity of a two headed heavy mero myosin form of Myo6 was unaffected by Myo5a at low densities, and was inhibited at high Myo5a densities.

UI MeSH Term Description Entries
D007700 Kinetics The rate dynamics in chemical or physical systems.
D008841 Actin Cytoskeleton Fibers composed of MICROFILAMENT PROTEINS, which are predominately ACTIN. They are the smallest of the cytoskeletal filaments. Actin Filaments,Microfilaments,Actin Microfilaments,Actin Cytoskeletons,Actin Filament,Actin Microfilament,Cytoskeleton, Actin,Cytoskeletons, Actin,Filament, Actin,Filaments, Actin,Microfilament,Microfilament, Actin,Microfilaments, Actin
D002465 Cell Movement The movement of cells from one location to another. Distinguish from CYTOKINESIS which is the process of dividing the CYTOPLASM of a cell. Cell Migration,Locomotion, Cell,Migration, Cell,Motility, Cell,Movement, Cell,Cell Locomotion,Cell Motility,Cell Movements,Movements, Cell
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D018995 Myosin Heavy Chains The larger subunits of MYOSINS. The heavy chains have a molecular weight of about 230 kDa and each heavy chain is usually associated with a dissimilar pair of MYOSIN LIGHT CHAINS. The heavy chains possess actin-binding and ATPase activity. Myosin Heavy Chain,Heavy Chain, Myosin,Heavy Chains, Myosin

Related Publications

Bhagavathi Ramamurthy, and Wenxiang Cao, and Enrique M De la Cruz, and Mark S Mooseker
January 1987, Nature,
Bhagavathi Ramamurthy, and Wenxiang Cao, and Enrique M De la Cruz, and Mark S Mooseker
May 2002, The EMBO journal,
Bhagavathi Ramamurthy, and Wenxiang Cao, and Enrique M De la Cruz, and Mark S Mooseker
October 1998, Biophysical journal,
Bhagavathi Ramamurthy, and Wenxiang Cao, and Enrique M De la Cruz, and Mark S Mooseker
April 2002, Nature cell biology,
Bhagavathi Ramamurthy, and Wenxiang Cao, and Enrique M De la Cruz, and Mark S Mooseker
February 2017, Proceedings of the National Academy of Sciences of the United States of America,
Bhagavathi Ramamurthy, and Wenxiang Cao, and Enrique M De la Cruz, and Mark S Mooseker
September 2000, The Journal of cell biology,
Bhagavathi Ramamurthy, and Wenxiang Cao, and Enrique M De la Cruz, and Mark S Mooseker
January 2013, Biophysics (Nagoya-shi, Japan),
Bhagavathi Ramamurthy, and Wenxiang Cao, and Enrique M De la Cruz, and Mark S Mooseker
January 1988, Bio Systems,
Bhagavathi Ramamurthy, and Wenxiang Cao, and Enrique M De la Cruz, and Mark S Mooseker
December 1989, Journal of biochemistry,
Bhagavathi Ramamurthy, and Wenxiang Cao, and Enrique M De la Cruz, and Mark S Mooseker
April 1997, Biophysical journal,
Copied contents to your clipboard!