Proteomics of testis from SPPL2c KO mice Version 1
External LinkSignal peptide peptidase (SPP) and the four homologous SPP-like (SPPL) proteases constitute a family of intramembrane aspartyl proteases with selectivity for type II-oriented transmembrane segments. Here, we have analysed the physiological function of the orphan protease SPPL2c, previously considered to represent a non-expressed pseudogene. We identified proteolytic activity of SPPL2c towards selected tail-anchored proteins. Despite shared ER localization, SPPL2c and SPP exhibit distinct, though partially overlapping substrate spectra and inhibitory profiles and are organised in different high molecular-weight complexes. Unexpectedly, SPPL2c is specifically expressed in murine and human testis where it is primarily localised in spermatids. In mice, SPPL2c-deficiency leads to a loss of elongated spermatids and reduced motility of mature spermatozoa, but preserved fertility. Additionally, matings of male and female SPPL2c-/- mice exhibit reduced litter sizes. Using proteomics we identified the sarco/endoplasmic reticulum Ca2+-ATPase (SERCA2)-regulating protein phospholamban (PLN) as a physiological SPPL2c substrate. Accumulation of PLN correlates with a decrease of intracellular Ca2+ levels in elongated spermatids that likely contributes to the compromised male germ cell differentiation and function of SPPL2c-/- mice.
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Created: 8th Jul 2024 at 10:45
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Version 1 (earliest) Created 8th Jul 2024 at 10:45 by Rainer Malik
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Institutions: LMU Klinikum
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This project serves as a centralized repository for omics datasets published by research groups within the SyNergy Cluster. It encompasses investigations such as proteomics and transcriptomics, which are further divided into individual studies led by SyNergy members. Each study is linked to relevant publications, assays and data files (with links to external repositories).
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Submitter: Rainer Malik
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Assays: Affinity purification coupled with mass spectrometry proteomics (human), Affinity purification coupled with mass spectrometry proteomics (human), Affinity purification coupled with mass spectrometry proteomics (human), Affinity purification coupled with mass spectrometry proteomics (human), Affinity purification coupled with mass spectrometry proteomics (human), Affinity purification coupled with mass spectrometry proteomics (human), Affinity purification coupled with mass spectrometry proteomics (human), Affinity purification coupled with mass spectrometry proteomics (human), Affinity purification coupled with mass spectrometry proteomics (human), Bottom-up proteomics (human), Bottom-up proteomics (mouse), Bottom-up proteomics (mouse), Bottom-up proteomics (mouse), Bottom-up proteomics (mouse), Gel-based experiment (human), Phosphoproteomics / Bottom-up proteomics (mouse), Proximity-proteomics-based autophagosome content profiling (human), SWATH MS (human), SWATH MS (human, mouse), SWATH MS (mouse), Shotgun proteomics (human), Shotgun proteomics (human), Shotgun proteomics (human), Shotgun proteomics (human), Shotgun proteomics (human), Shotgun proteomics (human), Shotgun proteomics (human), Shotgun proteomics (human), Shotgun proteomics (human), Shotgun proteomics (human), Shotgun proteomics (human), Shotgun proteomics (human), Shotgun proteomics (human), Shotgun proteomics (human), Shotgun proteomics (human), Shotgun proteomics (human), Shotgun proteomics (human, mouse), Shotgun proteomics (human, mouse), Shotgun proteomics (human, mouse), Shotgun proteomics (human, mouse), Shotgun proteomics (macaque), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (mouse), Shotgun proteomics (rat), Untargeted Proteomics (mouse)
Signal peptide peptidase (SPP) and the four homologous SPP-like (SPPL) proteases constitute a family of intramembrane aspartyl proteases with selectivity for type II-oriented transmembrane segments. Here, we have analysed the physiological function of the orphan protease SPPL2c, previously considered to represent a non-expressed pseudogene. We identified proteolytic activity of SPPL2c towards selected tail-anchored proteins. Despite shared ER localization, SPPL2c and SPP exhibit distinct, though ...
Post-nuclear supernatants were prepared from testis of wild type and SPPL2c-/- mice (n=5 per genotype). After removal of the tunica albuginea, testicles from two wild type mice were minced with an ultraturrax in 250 mM sucrose, 10 mM HEPES-NaOH, pH 7.4 and 1 mM EDTA (HB, homogenisation buffer) and then further homogenised by eight strokes of a Potter homogeniser. For sedimentation of nuclei, the tissue homogenate was centrifuged at 750 x g for 10 min. The supernatants were collected as post-nuclear ...
Submitter: Rainer Malik
Assay type: Proteomics
Technology type: Technology Type
Investigation: Proteomics (Published)
