Tubulin Polymerization Promoting Protein, Ringmaker, and MAP1B Homolog Futsch Coordinate Microtubule Organization and Synaptic Growth

Ringmaker (Ringer) is homologous to the human Tubulin Polymerization Promoting Proteins (TPPPs) that are implicated in the stabilization and bundling of microtubules (MTs) that are particularly important for neurons and are also implicated in synaptic organization and plasticity. No functional data...

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Bibliographic Details
Published inFrontiers in cellular neuroscience Vol. 13; p. 192
Main Authors Shi, Qian, Lin, Yong Qi, Saliba, Afaf, Xie, Jing, Neely, G Gregory, Banerjee, Swati
Format Journal Article
LanguageEnglish
Published Switzerland Frontiers Research Foundation 15.05.2019
Frontiers Media S.A
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Summary:Ringmaker (Ringer) is homologous to the human Tubulin Polymerization Promoting Proteins (TPPPs) that are implicated in the stabilization and bundling of microtubules (MTs) that are particularly important for neurons and are also implicated in synaptic organization and plasticity. No functional data exist that have addressed the role of TPPP in synapse organization in any system. Here, we present the phenotypic and functional characterization of mutants during larval neuromuscular junction (NMJ) synaptic development. mutants show reduced synaptic growth and transmission and display phenotypic similarities and genetic interactions with the homolog of vertebrate Microtubule Associated Protein (MAP)1B, Immunohistochemical and biochemical analyses show that individual and combined loss of Ringer and Futsch cause a significant reduction in MT loops at the NMJs and reduced acetylated-tubulin levels. Presynaptic over-expression of Ringer and Futsch causes elevated levels of acetylated-tubulin and significant increase in NMJ MT loops. These results indicate that Ringer and Futsch regulate synaptic MT organization in addition to synaptic growth. Together our findings may inform studies on the close mammalian homolog, TPPP, and provide insights into the role of MTs and associated proteins in synapse growth and organization.
Bibliography:Edited by: Davide Cervia, Università degli Studi della Tuscia, Italy
This article was submitted to Cellular Neurophysiology, a section of the journal Frontiers in Cellular Neuroscience
Reviewed by: Timothy Mosca, Thomas Jefferson University, United States; Archan Ganguly, University of California, San Diego, United States; Judit Ovadi, Hungarian Academy of Sciences (MTA), Hungary
ISSN:1662-5102
1662-5102
DOI:10.3389/fncel.2019.00192