28S ribosomal protein S33, mitochondrial is a protein that in humans is encoded by the MRPS33 gene.^[5][6][7]

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MRPS33
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 3J9M
Identifiers
Aliases	MRPS33, MRP-S33, PTD003, S33mt, CGI-139, mitochondrial ribosomal protein S33
External IDs	OMIM: 611993 MGI: 1338046 HomoloGene: 7729 GeneCards: MRPS33
Gene location (Human) Chr. Chromosome 7 (human)[1] Band 7q34 Start 141,002,610 bp[1] End 141,015,228 bp[1]
Gene location (Mouse) Chr. Chromosome 6 (mouse)[2] Band 6 B1|6 Start 39,778,738 bp[2] End 39,787,922 bp[2]
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in triceps brachii muscle rectum thoracic diaphragm left ventricle islet of Langerhans biceps brachii gastrocnemius muscle body of pancreas right adrenal gland left adrenal gland Top expressed in secondary oocyte ganglionic eminence lens white adipose tissue neural tube adrenal gland quadriceps femoris muscle urinary bladder proximal tubule stomach More reference expression data BioGPS More reference expression data
Gene ontology Molecular function structural constituent of ribosome Cellular component mitochondrial inner membrane ribosome mitochondrion mitochondrial small ribosomal subunit Biological process mitochondrial translational elongation mitochondrial translational termination protein biosynthesis Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 51650 14548 Ensembl ENSG00000090263 ENSMUSG00000029918 UniProt Q9Y291 Q9D2R8 RefSeq (mRNA) NM_053035 NM_016071 NM_001010930 NM_010270 RefSeq (protein) NP_057155 NP_444263 NP_001010930 NP_034400 Location (UCSC) Chr 7: 141 – 141.02 Mb Chr 6: 39.78 – 39.79 Mb PubMed search [3] [4]
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Mammalian mitochondrial ribosomal proteins are encoded by nuclear genes and help in protein synthesis within the mitochondrion. Mitochondrial ribosomes (mitoribosomes) consist of a small 28S subunit and a large 39S subunit. They have an estimated 75% protein to rRNA composition compared to prokaryotic ribosomes, where this ratio is reversed. Another difference between mammalian mitoribosomes and prokaryotic ribosomes is that the latter contain a 5S rRNA. Among different species, the proteins comprising the mitoribosome differ greatly in sequence, and sometimes in biochemical properties, which prevents easy recognition by sequence homology. The 28S subunit of the mammalian mitoribosome may play a crucial and characteristic role in translation initiation. This gene encodes a 28S subunit protein that is one of the more highly conserved mitochondrial ribosomal proteins among mammals, Drosophila and Caenorhabditis elegans. Splice variants that differ in the 5' UTR have been found for this gene; all variants encode the same protein. Pseudogenes corresponding to this gene are found on chromosomes 1q, 4p, 4q, and 20q^[7]