26S proteasome regulatory subunit 4 (PSMC1)
The protein contains 440 amino acids for an estimated molecular weight of 49185 Da.
Component of the 26S proteasome, a multiprotein complex involved in the ATP-dependent degradation of ubiquitinated proteins. This complex plays a key role in the maintenance of protein homeostasis by removing misfolded or damaged proteins, which could impair cellular functions, and by removing proteins whose functions are no longer required. Therefore, the proteasome participates in numerous cellular processes, including cell cycle progression, apoptosis, or DNA damage repair. PSMC1 belongs to the heterohexameric ring of AAA (ATPases associated with diverse cellular activities) proteins that unfolds ubiquitinated target proteins that are concurrently translocated into a proteolytic chamber and degraded into peptides. (updated: Nov. 22, 2017)
Protein identification was indicated in the following studies:
- Goodman and co-workers. (2013) The proteomics and interactomics of human erythrocytes. Exp Biol Med (Maywood) 238(5), 509-518.
- Lange and co-workers. (2014) Annotating N termini for the human proteome project: N termini and Nα-acetylation status differentiate stable cleaved protein species from degradation remnants in the human erythrocyte proteome. J Proteome Res. 13(4), 2028-2044.
- Hegedűs and co-workers. (2015) Inconsistencies in the red blood cell membrane proteome analysis: generation of a database for research and diagnostic applications. Database (Oxford) 1-8.
- Wilson and co-workers. (2016) Comparison of the Proteome of Adult and Cord Erythroid Cells, and Changes in the Proteome Following Reticulocyte Maturation. Mol Cell Proteomics. 15(6), 1938-1946.
- Bryk and co-workers. (2017) Quantitative Analysis of Human Red Blood Cell Proteome. J Proteome Res. 16(8), 2752-2761.
- D'Alessandro and co-workers. (2017) Red blood cell proteomics update: is there more to discover? Blood Transfus. 15(2), 182-187.
- Chu and co-workers. (2018) Quantitative mass spectrometry of human reticulocytes reveal proteome-wide modifications during maturation. Br J Haematol. 180(1), 118-133.
Methods
The following articles were analysed to gather the proteome content of erythrocytes.
The gene or protein list provided in the studies were processed using the ID mapping API of Uniprot in September 2018. The number of proteins identified and mapped without ambiguity in these studies is indicated below.
Only Swiss-Prot entries (reviewed) were considered for protein evidence assignation.
| Publication | Identification 1 | Uniprot mapping 2 | Not mapped / Obsolete | TrEMBL | Swiss-Prot |
|---|---|---|---|---|---|
| Goodman (2013) | 2289 (gene list) | 2278 | 53 | 20599 | 2269 |
| Lange (2014) | 1234 | 1234 | 7 | 28 | 1224 |
| Hegedus (2015) | 2638 | 2622 | 0 | 235 | 2387 |
| Wilson (2016) | 1658 | 1528 | 170 | 291 | 1068 |
| d'Alessandro (2017) | 1826 | 1817 | 2 | 0 | 1815 |
| Bryk (2017) | 2090 | 2060 | 10 | 108 | 1942 |
| Chu (2018) | 1853 | 1804 | 55 | 362 | 1387 |
1 as available in the article and/or in supplementary material
2 uniprot mapping returns all protein isoforms as one entry
The compilation of older studies can be retrieved from the Red Blood Cell Collection database.
The data and differentiation stages presented below come from the proteomic study and analysis performed by our partners of the GReX consortium, more details are available in their published work.
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Biological Process
Anaphase-promoting complex-dependent catabolic process
Antigen processing and presentation of exogenous peptide antigen via MHC class I
Antigen processing and presentation of exogenous peptide antigen via MHC class I, TAP-dependent
Antigen processing and presentation of peptide antigen via MHC class I
Apoptotic process
Cellular nitrogen compound metabolic process
DNA damage response, signal transduction by p53 class mediator resulting in cell cycle arrest
Fc-epsilon receptor signaling pathway
G1/S transition of mitotic cell cycle
Gene expression
Interleukin-1-mediated signaling pathway
MAPK cascade
Mitotic cell cycle
Negative regulation of apoptotic process
Negative regulation of canonical Wnt signaling pathway
Negative regulation of G2/M transition of mitotic cell cycle
Negative regulation of neuron death
NIK/NF-kappaB signaling
Obsolete negative regulation of ubiquitin-protein ligase activity involved in mitotic cell cycle
Obsolete positive regulation of ubiquitin-protein ligase activity involved in regulation of mitotic cell cycle transition
Obsolete regulation of ubiquitin-protein ligase activity involved in mitotic cell cycle
Positive regulation of canonical Wnt signaling pathway
Positive regulation of RNA polymerase II transcription preinitiation complex assembly
Post-translational protein modification
Pre-replicative complex assembly
Proteasome-mediated ubiquitin-dependent protein catabolic process
Protein catabolic process
Protein deubiquitination
Protein folding
Protein polyubiquitination
Regulation of apoptotic process
Regulation of cellular amino acid metabolic process
Regulation of hematopoietic stem cell differentiation
Regulation of mitotic cell cycle phase transition
Regulation of mRNA stability
Regulation of transcription from RNA polymerase II promoter in response to hypoxia
SCF-dependent proteasomal ubiquitin-dependent protein catabolic process
Small molecule metabolic process
Stimulatory C-type lectin receptor signaling pathway
T cell receptor signaling pathway
Transmembrane transport
Tumor necrosis factor-mediated signaling pathway
Ubiquitin-dependent ERAD pathway
Viral process
Wnt signaling pathway, planar cell polarity pathway
The reference OMIM entry for this protein is 602706
Proteasome 26s subunit, atpase, 1; psmc1
Protease 26s, subunit 4; s4
DESCRIPTION
Ubiquitinated proteins are degraded by a 26S ATP-dependent protease. The protease is composed of a 20S catalytic proteasome and 2 PA700 regulatory modules. The PA700 complex is composed of multiple subunits, including at least 6 related ATPases, including PSMC1, and approximately 15 non-ATPase polypeptides. Each of the 6 ATPases, namely PSMC1, PSMC2 (154365), PSMC3 (186852), PSMC4 (602707), PSMC5 (601681), and PSMC6 (602708), contains an AAA (ATPases associated with diverse cellular activities) domain (summary by Tanahashi et al., 1998).CLONING
Dubiel et al. (1992) cloned cDNAs encoding subunit 4 (S4) of the 26S protease by screening a HeLa cell cDNA library with probes that were produced using the protein sequence. The 440-amino acid protein has a molecular mass of 51 kD by SDS-PAGE. Hoyle and Fisher (1996) found that the human and mouse PSMC1 proteins have 99% amino acid identity.GENE FUNCTION
Spinocerebellar ataxia type 7 (SCA7; 164500) is a neurodegenerative disorder characterized by ataxia and selective neuronal cell loss caused by the expansion of a translated CAG repeat encoding a polyglutamine tract in ataxin-7, the SCA7 gene product. Matilla et al. (2001) used a 2-hybrid assay to show that ataxin-7 interacts with the ATPase subunit S4 of the 19S regulatory complex of the 26S proteasome. The ataxin-7/S4 association was modulated by the length of the polyglutamine tract, whereby S4 showed a stronger association with the wildtype allele of ataxin-7. Endogenous ataxin-7 localized to discrete nuclear foci that also contained additional components of the proteasomal complex. Immunohistochemical analyses suggested alterations either of the distribution or the levels of S4 immunoreactivity in neurons that degenerate in SCA7 brains. Immunoblot analyses demonstrated reduced levels of S4 in SCA7 cerebella without evident alterations in the levels of other proteasome subunits. The authors suggested a role for S4 and ubiquitin-mediated proteasomal proteolysis in the molecular pathogenesis of SCA7.MAPPING
By fluorescence in situ hybridization, Tanahashi et al. (1998) mapped the human PSMC1 gene to chromosome 19p13.3. However, Gross (2011) mapped the PSMC1 gene to chromosome 14q32.11 based on an alignment of the PSMC1 sequence (GenBank GENBANK BT009826) with the genomic sequence (GRCh37). By analysis of an interspecific backcross, Hoyle and Fisher (1996) mapped the mouse Psmc1 gene to chromosome 12.NOMENCLATURE
The PSMC1 gene product, which Dubiel et al. (1992) called subunit 4 (S4), is distinct from the PSMC4 (602707) gene product. ... More on the omim web site
Feb. 5, 2018: Protein entry updated
Automatic update: Entry updated from uniprot information.
Feb. 2, 2018: Protein entry updated
Automatic update: Uniprot description updated
Dec. 19, 2017: Protein entry updated
Automatic update: Uniprot description updated
Nov. 23, 2017: Protein entry updated
Automatic update: Uniprot description updated
March 15, 2016: Protein entry updated
Automatic update: OMIM entry 602706 was added.