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Novel function of PTP69D in giant fiber synapse formation
Title
Novel function of PTP69D in giant fiber synapse formation.
Creator
Lee, LaTasha Hoskins, Godenschwege, Tanja A., Graduate College
Abstract/Description
PTP69D is a receptor protein tyrosine phosphatase RPTP with two intracellular catalytic domains Cat1 and Cat2, which has been shown to play a role in axon outgrowth and guidance of embryonic motoneurons as well as targeting of photoreceptor neurons in the visual system of Drosophila melanogaster. Here, we characterized the developmental role of PTP69D in the giant fiber GF neurons; two interneurons in the central nervous system CNS that control the escape response of the fly. In addition to...
Show morePTP69D is a receptor protein tyrosine phosphatase RPTP with two intracellular catalytic domains Cat1 and Cat2, which has been shown to play a role in axon outgrowth and guidance of embryonic motoneurons as well as targeting of photoreceptor neurons in the visual system of Drosophila melanogaster. Here, we characterized the developmental role of PTP69D in the giant fiber GF neurons; two interneurons in the central nervous system CNS that control the escape response of the fly. In addition to guidance and targeting functions, our studies reveal an additional role for PTP69D in synaptic terminal growth in the CNS. We found that inhibition of phosphatase activity in catalytic domain Cat1 proximal to the transmembrane domain did not affect axon guidance or targeting but resulted in stunted terminal growth of the GFs. Cell autonomous rescue and knockdown experiments demonstrated a function for PTP69D in the GFs, but not its postsynaptic target neurons. In addition, complementation studies and structurefunction analyses revealed that for GF terminal growth Cat1 function of PTP69D requires the Immunoglobulin and the Cat2 domain, but not the Fibronectin III and the Membrane Proximal Region domains. In contrast, the Fibronectin III, but not the Immunoglobulin domains, were previously shown to be essential for axon targeting of photoreceptor neurons. Thus, our studies uncover a novel role for PTP69D in synaptic terminal growth in the CNS that is mechanistically distinct from its function during earlier developmental process.
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Date Issued
2014
PURL
http://purl.flvc.org/fau/fd/FA00005831
Format
Document (PDF)
Characterization of receptor protein tyrosine phosphatase PTP69D in the giant fiber circuit
Title
Characterization of receptor protein tyrosine phosphatase PTP69D in the giant fiber circuit.
Creator
Lee, LaTasha Hoskins, Godenschwege, Tanja A., Florida Atlantic University, Charles E. Schmidt College of Science, Department of Biological Sciences
Abstract/Description
PTP69D is a receptor protein tyrosine phosphatase (RPTP) with two intracellular catalytic domains (Cat1 and Cat2), which has been shown to play a role in axon outgrowth and guidance of embryonic motorneurons, as well as targeting of photoreceptor neurons in the visual system of Drosophila melanogaster. Here, we characterized the developmental role of PTP69D in the giant fiber (GF) neurons; two interneurons in the central nervous system (CNS) that control the escape response of the fly. In...
Show morePTP69D is a receptor protein tyrosine phosphatase (RPTP) with two intracellular catalytic domains (Cat1 and Cat2), which has been shown to play a role in axon outgrowth and guidance of embryonic motorneurons, as well as targeting of photoreceptor neurons in the visual system of Drosophila melanogaster. Here, we characterized the developmental role of PTP69D in the giant fiber (GF) neurons; two interneurons in the central nervous system (CNS) that control the escape response of the fly. In addition to guidance and targeting functions, our studies reveal an additional role for PTP69D in synaptic terminal growth in the CNS. We found that inhibition of phosphatase activity in catalytic domain (Cat1) proximal to the transmembrane domain did not affect axon guidance or targeting but resulted in stunted terminal growth of the GFs. Cell autonomous rescue and knockdown experiments demonstrated a function for PTP69D in the GFs, but not its postsynaptic target neurons. In addition,complementation studies and structure-function analyses revealed that for GF terminal growth, Cat1 function of PTP69D requires the immunoglobulin and the Cat2 domain but not the fibronectin type III repeats nor the membrane proximal region. In contrast, the fibronectin type III repeats, but not the immunoglobulin domains, were previously shown to be essential for axon targeting of photoreceptor neurons. Thus, our studies uncover a novel role for PTP69D in synaptic terminal growth in the CNS that is mechanistically distinct from its function during earlier developmental processes.
Show less
Date Issued
2014
PURL
http://purl.flvc.org/fau/fd/FA00004301, http://purl.flvc.org/fau/fd/FA00004301
Subject Headings
Drosophila melanogaster., Protein-tyrosine phosphatase--Metabolism., Protein-tyrosine kinase., Protein kinases--Inhibitors., Phosphoprotein phosphatases., Transcription factors., Cell receptors., Cellular signal transduction.
Format
Document (PDF)