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Elife ; 82019 10 30.
Artigo em Inglês | MEDLINE | ID: mdl-31663854

RESUMO

Glutamate secretion at excitatory synapses is tightly regulated to allow for the precise tuning of synaptic strength. Vesicular Glutamate Transporters (VGLUT) accumulate glutamate into synaptic vesicles (SV) and thereby regulate quantal size. Further, the number of release sites and the release probability of SVs maybe regulated by the organization of active-zone proteins and SV clusters. In the present work, we uncover a mechanism mediating an increased SV clustering through the interaction of VGLUT1 second proline-rich domain, endophilinA1 and intersectin1. This strengthening of SV clusters results in a combined reduction of axonal SV super-pool size and miniature excitatory events frequency. Our findings support a model in which clustered vesicles are held together through multiple weak interactions between Src homology three and proline-rich domains of synaptic proteins. In mammals, VGLUT1 gained a proline-rich sequence that recruits endophilinA1 and turns the transporter into a regulator of SV organization and spontaneous release.


Assuntos
Proteínas Adaptadoras de Transdução de Sinal/metabolismo , Glutamatos/metabolismo , Vesículas Sinápticas/metabolismo , Proteína Vesicular 1 de Transporte de Glutamato/metabolismo , Animais , Transporte Biológico , Humanos , Camundongos , Camundongos Knockout , Ratos , Proteína Vesicular 1 de Transporte de Glutamato/deficiência
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