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Liu H, Tan R, Tong J, Wen S, Wu C, Rao M, Zhu J, Qi S, Kong E. Palmitoylation is required for Sept8-204 and Sept5 to form vesicle-like structure and colocalize with synaptophysin. J Cell Biochem 2024; 125:e30529. [PMID: 38308620 DOI: 10.1002/jcb.30529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 01/09/2024] [Accepted: 01/24/2024] [Indexed: 02/05/2024]
Abstract
Sept8 is a vesicle associated protein and there are two typical transcriptional variants (Sept8-204 and Sept8-201) expressed in mice brain. Interestingly, the coexpression of Sept8-204/Sept5 induces the formation of small sized vesicle-like structure, while that of the Sept8-201/Sept5 produces large puncta. Sept8 is previously shown to be palmitoylated. Here it was further revealed that protein palmitoylation is required for Sept8-204/Sept5 to maintain small sized vesicle-like structure and colocalize with synaptophysin, since either the expression of nonpalmitoylated Sept8-204 mutant (Sept8-204-3CA) or inhibiting Sept8-204 palmitoylation by 2-BP with Sept5 produces large puncta, which barely colocalizes with synaptophysin (SYP). Moreover, it was shown that the dynamic palmitoylation of Sept8-204 is controlled by ZDHHC17 and PPT1, loss of ZDHHC17 decreases Sept8-204 palmitoylation and induces large puncta, while loss of PPT1 increases Sept8-204 palmitoylation and induces small sized vesicle-like structure. Together, these findings suggest that palmitoylation is essential for the maintenance of the small sized vesicle-like structure for Sept8-204/Sept5, and may hint their important roles in synaptic functions.
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Affiliation(s)
- Huicong Liu
- The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
- Xinxiang Key Laboratory of Protein Palmitoylation and Major Human Diseases, Henan Health Commission Key Laboratory of Gastrointestinal Cancer Prevention and Treatment, Institute of Psychiatry and Neuroscience, Xinxiang Medical University, Xinxiang, China
| | - Rong Tan
- The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
- Xinxiang Key Laboratory of Protein Palmitoylation and Major Human Diseases, Henan Health Commission Key Laboratory of Gastrointestinal Cancer Prevention and Treatment, Institute of Psychiatry and Neuroscience, Xinxiang Medical University, Xinxiang, China
| | - Jia Tong
- The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
- Xinxiang Key Laboratory of Protein Palmitoylation and Major Human Diseases, Henan Health Commission Key Laboratory of Gastrointestinal Cancer Prevention and Treatment, Institute of Psychiatry and Neuroscience, Xinxiang Medical University, Xinxiang, China
| | - Shuo Wen
- The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
- Xinxiang Key Laboratory of Protein Palmitoylation and Major Human Diseases, Henan Health Commission Key Laboratory of Gastrointestinal Cancer Prevention and Treatment, Institute of Psychiatry and Neuroscience, Xinxiang Medical University, Xinxiang, China
| | - Can Wu
- The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
- Xinxiang Key Laboratory of Protein Palmitoylation and Major Human Diseases, Henan Health Commission Key Laboratory of Gastrointestinal Cancer Prevention and Treatment, Institute of Psychiatry and Neuroscience, Xinxiang Medical University, Xinxiang, China
| | - Muding Rao
- The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
- Xinxiang Key Laboratory of Protein Palmitoylation and Major Human Diseases, Henan Health Commission Key Laboratory of Gastrointestinal Cancer Prevention and Treatment, Institute of Psychiatry and Neuroscience, Xinxiang Medical University, Xinxiang, China
| | - Jiangli Zhu
- State Key Laboratory of Biotherapy and Cancer Center, Department of Urology, Sichuan University and National Collaborative Innovation Center, Chengdu, China
| | - Shiqian Qi
- State Key Laboratory of Biotherapy and Cancer Center, Department of Urology, Sichuan University and National Collaborative Innovation Center, Chengdu, China
| | - Eryan Kong
- The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
- Xinxiang Key Laboratory of Protein Palmitoylation and Major Human Diseases, Henan Health Commission Key Laboratory of Gastrointestinal Cancer Prevention and Treatment, Institute of Psychiatry and Neuroscience, Xinxiang Medical University, Xinxiang, China
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Adhikari N, McGill IN, Hadwiger JA. MAPK docking motif in the Dictyostelium Gα2 subunit is required for aggregation and transcription factor translocation. Cell Signal 2021; 87:110117. [PMID: 34418534 DOI: 10.1016/j.cellsig.2021.110117] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 08/06/2021] [Accepted: 08/07/2021] [Indexed: 01/05/2023]
Abstract
Some G protein alpha subunits contain a mitogen-activated protein kinase (MAPK) docking motif (D-motif) near the amino terminus that can impact cellular responses to external signals. The Dictyostelium Gα2 G protein subunit is required for chemotaxis to cAMP during the onset of multicellular development and this subunit contains a putative D-motif near the amino terminus. The Gα2 subunit D-motif was altered to examine its potential role in chemotaxis and multicellular development. In gα2- cells the expression of the D-motif mutant (Gα2D-) or wild-type subunit from high copy number vectors rescued cell aggregation but blocked the transition of mounds into slugs. This phenotype was also observed in parental strains with a wild-type gα2 locus indicating that the heterologous Gα2 subunit expression interferes with multicellular morphogenesis. Expression of the Gα2D- subunit from a low copy number vectors in gα2- cells did not rescue aggregation whereas the wild-type Gα2 subunit rescued aggregation efficiently and allowed wild-type morphological development. The Gα2D- and Gα2 subunit were both capable of restoring comparable levels of cAMP stimulated motility and the ability to co-aggregate with wild-type cells implying that the aggregation defect of Gα2D- expressing cells is due to insufficient intercellular signaling. Expression of the Gα2 subunit but not the Gα2D- subunit fully restored the ability of cAMP to stimulate the translocation of the GtaC transcription factor suggesting the D-motif is important for transcription factor regulation. These results suggest that the D-motif of Gα2 plays a role in aggregation and other developmental responses involved with cAMP signaling.
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Affiliation(s)
- Nirakar Adhikari
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK 74078-3020, United States of America
| | - Imani N McGill
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK 74078-3020, United States of America
| | - Jeffrey A Hadwiger
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK 74078-3020, United States of America.
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