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ATP Driven Pumps II: P-type Pumps01:34

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The P-type pumps are a large family of integral membrane transporter ATPases. They are divided into five major types based on substrate specificity, from I to V.
A typical P-type pump has three cytosolic domains: nucleotide-binding (N), phosphorylation (P), and activator (A) domains. These domains are connected to the membrane-spanning helices by short amino acid segments. ATP hydrolysis and covalent phosphoenzyme intermediate formation are crucial parts of the catalytic cycle. At the highly...
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ATP Driven Pumps III: V-type Pumps01:30

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V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of a few specialized eukaryotic cells, and some prokaryotes. They are also known as the V1Vo-ATPase, that couple ATP hydrolysis to transport protons against a concentration gradient.
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ATP Driven Pumps I: An Overview01:27

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ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
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ATP Synthase: Mechanism01:48

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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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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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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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The CATP-8/P5A-type ATPase functions in multiple pathways during neuronal patterning.

Leo T H Tang1, Meera Trivedi2, Jenna Freund2

  • 1Department of Genetics Albert Einstein College of Medicine, Bronx, New York, United States of America.

Plos Genetics
|July 1, 2021
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The catp-8/P5A-ATPase is crucial for nervous system development in C. elegans, regulating neuronal patterning, migration, and dendritic tree formation. This P5A-ATPase plays specific roles in various genetic pathways, impacting neuronal development.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Developmental Biology

Background:

  • Neuronal circuit assembly involves complex processes like cell migration and neurite outgrowth.
  • P5A-ATPases are a conserved family of transporters, but their function in metazoans, particularly in neural development, remains largely unknown.
  • Identifying novel regulators of neural patterning is essential for understanding nervous system development.

Purpose of the Study:

  • To investigate the role of the Caenorhabditis elegans catp-8/P5A-ATPase in nervous system development.
  • To elucidate the specific functions and pathways regulated by catp-8/P5A-ATPase in neuronal patterning, migration, and morphogenesis.
  • To determine the subcellular localization and autonomous/non-autonomous functions of catp-8/P5A-ATPase.

Main Methods:

  • Genetic screens to identify genes involved in neural patterning.
  • Analysis of catp-8/P5A-ATPase function in C. elegans using genetic mutants and reporter constructs.
  • Investigation of catp-8/P5A-ATPase localization using a reporter system.
  • Genetic analyses to determine interactions with known developmental pathways (e.g., Menorin, Wnt signaling).

Main Results:

  • catp-8/P5A-ATPase is essential for shaping dendritic trees of PVD neurons.
  • It plays critical roles in axonal guidance, midline repulsion, and both embryonic and postembryonic neuronal migrations.
  • catp-8/P5A-ATPase functions in both cell-autonomous and non-autonomous manners and localizes to the endoplasmic reticulum.
  • It acts within multiple genetic pathways, including Menorin and Wnt signaling, and is required for localizing specific transmembrane proteins for dendrite morphogenesis.

Conclusions:

  • catp-8/P5A-ATPase is a multifunctional regulator of diverse aspects of neuronal development in C. elegans.
  • Its roles are specific within different genetic pathways, suggesting a role in protein localization or regulation of transmembrane/secreted proteins.
  • This study clarifies the previously elusive function of P5A-ATPases in metazoan neural development.