Abstract
Here, we examine the synaptic function of the receptor protein tyrosine phosphatase (RPTP), Dlar, and an associated intracellular protein, Dliprin-alpha, at the Drosophila larval neuromuscular junction. We show that Dliprin-alpha and Dlar are required for normal synaptic morphology. We also find that synapse complexity is proportional to the amount of Dlar gene product, suggesting that Dlar activity determines synapse size. Ultrastructural analysis reveals that Dliprin-alpha and Dlar are required to define the size and shape of the presynaptic active zone. Accordingly, there is a concomitant decrease in synaptic transmission in both mutants. Finally, epistasis analysis indicates that Dliprin-alpha is required for Dlar's action at the synapse. These data suggest a model where Dliprin-alpha and Dlar cooperate to regulate the formation and/or maintenance of a network of presynaptic proteins.
Publication types
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Adaptor Proteins, Signal Transducing
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Amino Acid Sequence / genetics
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Animals
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Drosophila / embryology*
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Drosophila / enzymology
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Drosophila / genetics
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Drosophila / physiology
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Drosophila Proteins / genetics
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Drosophila Proteins / physiology*
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Humans
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Intracellular Signaling Peptides and Proteins
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Male
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Molecular Sequence Data
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Morphogenesis / physiology
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Mutation / genetics
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Neuromuscular Junction / enzymology
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Neuromuscular Junction / genetics
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Neuromuscular Junction / growth & development
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Neuromuscular Junction / physiology
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Phosphoproteins / genetics
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Phosphoproteins / physiology*
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Protein Tyrosine Phosphatases / genetics
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Protein Tyrosine Phosphatases / physiology*
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Receptor-Like Protein Tyrosine Phosphatases
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Synapses / enzymology
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Synapses / genetics
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Synapses / physiology*
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Synapses / ultrastructure
Substances
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Adaptor Proteins, Signal Transducing
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Drosophila Proteins
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Intracellular Signaling Peptides and Proteins
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Liprin-alpha protein, Drosophila
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PPFIA1 protein, human
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Phosphoproteins
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Lar protein, Drosophila
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Protein Tyrosine Phosphatases
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Receptor-Like Protein Tyrosine Phosphatases