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Conservation of Protein Domains Over Different Proteins02:26

Conservation of Protein Domains Over Different Proteins

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Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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SNAREs and Membrane Fusion01:43

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Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
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ATP Synthase: Structure01:18

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ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...
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Recombinant &#945;- &#946;- and &#947;-Synucleins Stimulate Protein Phosphatase 2A Catalytic Subunit Activity in Cell Free Assays
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Synapsin E-domain is essential for α-synuclein function.

Alexandra Stavsky1, Leonardo A Parra-Rivas2,3, Shani Tal1

  • 1Department of Physiology and Cell Biology, Faculty of Health Sciences and School of Brain Sciences and Cognition, Ben-Gurion University of the Negev, Beer Sheva, Israel.

Biorxiv : the Preprint Server for Biology
|July 10, 2023
PubMed
Summary
This summary is machine-generated.

The synapsin E-domain binds to alpha-synuclein (α-syn), enabling its function in synaptic vesicle (SV) recycling. This interaction is crucial for maintaining healthy SV clusters at the synapse.

Keywords:
pHluorinsynapsessynapsinvesicle poolsα-synuclein

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Area of Science:

  • Neurobiology
  • Molecular Neuroscience
  • Cell Biology

Background:

  • Synaptic vesicle (SV) recycling is vital for neuronal communication.
  • Synucleins and synapsins are cytosolic proteins implicated in SV recycling.
  • The precise mechanisms of their cooperative roles remain unclear.

Conclusions:

  • Synapsin E-domain and α-synuclein (α-syn) cooperate in regulating synaptic vesicle dynamics.
  • The synapsin E-domain is essential for mediating α-syn's effects on synaptic vesicle clustering.
  • These findings provide mechanistic insight into the coordinated function of synucleins and synapsins in synaptic physiology.