Characterization of Cherax quadricarinatus prohibitin and its potential role in spermatogenesis |
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Authors: | Di-An Fang Yang Wang Juan Wang Li-Hua Liu Qun Wang |
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Affiliation: | 1. Scientific Observing and Experimental Station of Fishery Resources and Environment in the Changjiang River, Freshwater Fisheries Research Center, Wuxi, Shanshui Road 9, 214081, China;2. School of Life Science, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China |
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Abstract: | Prohibitin (PHB) proteins have diverse functions, such as cellular signaling, transcriptional control and mitochondrial biogenesis. In this study, we characterized PHB gene and its protein expression in Cherax quadricarinatus. PHB cDNA comprises 1472 nucleotides with an open reading frame of 828 bp, which encodes 275 amino acid residues. The highest transcript levels were found during the spermatogonial developmental phase, with the lowest levels detected during the resting phase in the reproductive cycle. Western blot analysis revealed that PHB is an approximately 30 kDa protein, and occurs in a number of unexpected isoforms, ranging from 30 kDa to greater than 180 kDa in the testes of different developmental phases, which may be the ubiquitinated substrates. The strongest immunolabeling signal was found in spermatogonia, with lower levels of staining in secondary spermatocytes, and weak or absent expression in mature sperm. Immunogold electron microscopy results confirmed the localization of PHB in the inner mitochondrial membranes. The results showed that PHB is a substrate protein for spermatogenesis, with a potential reproductive function involving sperm ubiquitination in invertebrates. |
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Keywords: | PHB, prohibitin IM, inner membranes Cq-PHB, Cherax quadricarinatus prohibitin RT-qPCR, real-time quantitative RT-PCR ML, maximum likelihood JTT, Jones&ndash Taylor&ndash Thornton PVDF, polyvinylidene difluoride IF, immunofluorescence PBS, phosphate-buffered saline FITC, fluorescein isothiocyanate IEM, immunogold electron microscopy TBS, Tris buffered saline H& E, hematoxylin and eosin S SPFH, tomatin/prohibitin/flotillin/HflK/C mtDNA, mitochondrial DNA |
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