Modulators of actin-myosin dissociation: Basis for muscle type functional differences during fatigue
dc.creator | Karatzaferi C., Adamek N., Geeves M.A. | en |
dc.date.accessioned | 2023-01-31T08:31:57Z | |
dc.date.available | 2023-01-31T08:31:57Z | |
dc.date.issued | 2017 | |
dc.identifier | 10.1152/AJPCELL.00023.2017 | |
dc.identifier.issn | 03636143 | |
dc.identifier.uri | http://hdl.handle.net/11615/74473 | |
dc.description.abstract | The muscle types present with variable fatigue tolerance, in part due to the myosin isoform expressed. However, the critical steps that define “fatigability” in vivo of fast vs. slow myosin isoforms, at the molecular level, are not yet fully understood. We examined the modulation of the ATP-induced myosin subfragment 1 (S1) dissociation from pyrene-actin by inorganic phosphate (Pi), pH, and temperature using a specially modified stopped-flow system that allowed fast kinetics measurements at physiological temperature. We contrasted the properties of rabbit psoas (fast) and bovine masseter (slow) myosins (obtained from samples collected from New Zealand rabbits and from a licensed abattoir, respectively, according to institutional and national ethics permits). To identify ATP cycling biochemical intermediates, we assessed ATP binding to a preequilibrated mixture of actomyosin and variable [ADP], pH (pH 7 vs. pH 6.2), and Pi (zero, 15, or 30 added mM Pi) in a range of temperatures (5 to 45°C). Temperature and pH variations had little, if any, effect on the ADP dissociation constant (KADP) for fast S1, but for slow S1, KADP was weakened with increasing temperature or low pH. In the absence of ADP, the dissociation constant for phosphate (KPi) was weakened with increasing temperature for fast S1. In the presence of ADP, myosin type differences were revealed at the apparent phosphate affinity, depending on pH and temperature. Overall, the newly revealed kinetic differences between myosin types could help explain the in vivo observed muscle type functional differences at rest and during fatigue. © the American Physiological Society | en |
dc.language.iso | en | en |
dc.source | American Journal of Physiology - Cell Physiology | en |
dc.source.uri | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85062743201&doi=10.1152%2fAJPCELL.00023.2017&partnerID=40&md5=6bde9119540a2ef44a7c4075cc6e10e1 | |
dc.subject | actin | en |
dc.subject | adenosine diphosphate | en |
dc.subject | adenosine triphosphate | en |
dc.subject | myosin | en |
dc.subject | phosphate | en |
dc.subject | actin | en |
dc.subject | adenosine triphosphate | en |
dc.subject | myosin | en |
dc.subject | actin myosin interaction | en |
dc.subject | animal tissue | en |
dc.subject | Article | en |
dc.subject | binding affinity | en |
dc.subject | biochemistry | en |
dc.subject | controlled study | en |
dc.subject | muscle fatigue | en |
dc.subject | New Zealand White (rabbit) | en |
dc.subject | nonhuman | en |
dc.subject | pH | en |
dc.subject | temperature measurement | en |
dc.subject | animal | en |
dc.subject | bovine | en |
dc.subject | drug effect | en |
dc.subject | Leporidae | en |
dc.subject | metabolism | en |
dc.subject | muscle fatigue | en |
dc.subject | physiology | en |
dc.subject | skeletal muscle | en |
dc.subject | Actins | en |
dc.subject | Adenosine Triphosphate | en |
dc.subject | Animals | en |
dc.subject | Cattle | en |
dc.subject | Muscle Fatigue | en |
dc.subject | Muscle, Skeletal | en |
dc.subject | Myosins | en |
dc.subject | Rabbits | en |
dc.subject | American Physiological Society | en |
dc.title | Modulators of actin-myosin dissociation: Basis for muscle type functional differences during fatigue | en |
dc.type | journalArticle | en |
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