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Related Concept Videos

Actin and Myosin in Muscle Contraction01:16

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Actin and myosin are contractile proteins that form the sarcomere found in skeletal muscle tissues for regulating muscle contraction. Actin, a globular contractile protein, interacts with myosin for muscle contraction. The skeletal tissue appears striped or striated under a microscope due to the repeated arrangement of contractile proteins actin and myosin along the length of myofibrils. Dark A bands and light I bands repeat along myofibrils, and the alignment of myofibrils in the cell causes...
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Excitation-contraction coupling is a series of events that occur between generating an action potential and initiating a muscle contraction. It occurs at the triad, a structure found in skeletal muscle fibers that comprise a T-tubule and terminal cisternae of the sarcoplasmic reticulum on each side. These triads are visible in longitudinally sectioned muscle fibers. They are typically located at the A-I junction — the junction between the A and I bands of the sarcomere.
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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
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The site of chemical communication between a motor neuron and a muscle fiber is called the neuromuscular junction (NMJ). The end of the motor neuron at the NMJ divides into a cluster of synaptic end bulbs. The cytoplasm of these bulbs consists of synaptic vesicles enclosing acetylcholine molecules, the principal neurotransmitter released at the NMJ. The region opposite the synaptic bulb that ends in the muscle fiber is called the motor end plate, which has acetylcholine receptors. Within the...
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Every cell in the body maintains a membrane potential due to an uneven distribution of positive and negative charges across its plasma membrane. The membrane potential is measured in millivolts and quantifies the difference in charge across the membrane.
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Myosin Va: Capturing cAMP for synaptic plasticity.

Rüdiger Rudolf1,2,3

  • 1Center for Mass Spectrometry and Optical Spectroscopy (CeMOS), Mannheim University of Applied Sciences, Mannheim, Germany.

Frontiers in Physiology
|January 19, 2024
PubMed
Summary
This summary is machine-generated.

Myosin Va motor protein is crucial for creating cAMP signaling microdomains at nerve-muscle synapses. This process is essential for recycling nicotinic acetylcholine receptors (nAChRs), vital for muscle contraction.

Keywords:
AKAPPKAacetylcholine receptorscAMPmicrodomainmyosin Vaneuromuscular junctionsynaptic plasticity

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Myosin Va is an actin-dependent motor protein involved in vesicular transport.
  • cAMP signaling specificity relies on microdomains coupling receptor activity to effectors.
  • Nicotinic acetylcholine receptors (nAChRs) are critical for muscle contraction.

Purpose of the Study:

  • To review the role of myosin Va in establishing cAMP microdomains at the mammalian nerve-muscle synapse.
  • To elucidate the involvement of myosin Va in the recycling of nAChRs.

Main Methods:

  • Literature review focusing on myosin Va function.
  • Analysis of molecular colocalization studies.
  • Examination of experimental data on myosin Va and protein kinase A regulatory subunit Iα function.

Main Results:

  • The nerve-muscle synapse exhibits a unique actin-dependent microstructure.
  • Myosin Va, protein kinase A regulatory subunit Iα, nAChR, and rapsyn colocalize in synaptic vesicles.
  • Impaired myosin Va or protein kinase A regulatory subunit Iα disrupts nAChR stability.

Conclusions:

  • Myosin Va plays a key role in organizing cAMP microdomains essential for nAChR recycling at the nerve-muscle synapse.
  • Proper function of myosin Va is critical for maintaining nAChR stability and synaptic function.