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GTP Binding Is Required for SEPT12 to Form Filaments and to Interact with SEPT11  

Ding, Xiangming (State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Science, Fudan University)
Yu, Wenbo (State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Science, Fudan University)
Liu, Ming (State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Science, Fudan University)
Shen, ShuQing (State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Science, Fudan University)
Chen, Fang (State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Science, Fudan University)
Cao, Lihuan (State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Science, Fudan University)
Wan, Bo (State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Science, Fudan University)
Yu, Long (State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Science, Fudan University)
Abstract
Septins are a family of filament-forming GTP-binding proteins involved in a variety of cellular process such as cytokinesis, exocytosis, and membrane dynamics. Here we report the biochemical and immunocytochemical characterization of a recently identified mammalian septin, SEPT12. SEPT12 binds GTP in vitro, and a mutation (Gly56 to Asn) in the GTP-binding motif abolished binding. Immunocytochemical analysis revealed that wild-type SEPT12 formed filamentous structures when transiently expressed in Hela cells whereas $SEPT12^{G56A}$ generated large aggregates. In addition, wild-type SEPT12 failed to form filaments when coexpressed with $SEPT12^{G56A}$. We also observed that GTP-binding by SEPT12 is required for interaction with SEPT11 but not with itself.
Keywords
Co-localization; GTP-binding Domain; Protein Interaction; Septin; Subcellular Localization;
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