MRPL45

gene
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Also known as MGC11321Mba1mL45

Summary

MRPL45 (mitochondrial ribosomal protein L45, HGNC:16651) is a protein-coding gene on chromosome 17q12, encoding Large ribosomal subunit protein mL45 (Q9BRJ2). Component of the mitochondrial large ribosomal subunit (mt-LSU). It is a selective cancer dependency (DepMap: 85.6% of cell lines).

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. This gene encodes a 39S subunit protein. Alternative splicing results in multiple transcript variants. Pseudogenes corresponding to this gene are found on chromosomes 2p and 17q.

Source: NCBI Gene 84311 — RefSeq curated summary.

At a glance

  • GWAS associations: 1
  • Clinical variants (ClinVar): 73 total
  • Cancer dependency (DepMap): dependent in 85.6% of screened cell lines
  • MANE Select transcript: NM_032351

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:16651
Approved symbolMRPL45
Namemitochondrial ribosomal protein L45
Location17q12
Locus typegene with protein product
StatusApproved
AliasesMGC11321, Mba1, mL45
Ensembl geneENSG00000278845
Ensembl biotypeprotein_coding
OMIM611850
Entrez84311

Gene structure

Transcript identifiers

Ensembl transcripts: 7 — 7 protein_coding

ENST00000613675, ENST00000619548, ENST00000862418, ENST00000862419, ENST00000862420, ENST00000862421, ENST00000923665

RefSeq mRNA: 2 — MANE Select: NM_032351 NM_001278279, NM_032351

CCDS: CCDS11326, CCDS74047

Canonical transcript exons

ENST00000613675 — 8 exons

ExonStartEnd
ENSE000037121303831868738318735
ENSE000037177283832212638322299
ENSE000037340203832250938323211
ENSE000037493323829935138299468
ENSE000037507153829844938298626
ENSE000037517133830653338306631
ENSE000037524163832061838320767
ENSE000038497433829716838297249

Expression profiles

Bgee: expression breadth ubiquitous, 134 present calls, max score 94.35.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 6.3839 / max 88.6392, expressed in 1715 samples.

FANTOM5 promoters (2 alternative TSS)

Promoter IDTPM avgSamples expressed
1604746.08451708
1604750.2994134

Top tissues by expression

134 total, by Bgee expression score (0-100, higher = more expressed):

TissueAnatomy IDExpression scoreQuality
gastrocnemiusUBERON:000138894.35gold quality
muscle of legUBERON:000138394.19gold quality
islet of LangerhansUBERON:000000693.39gold quality
cortical plateUBERON:000534393.03gold quality
body of pancreasUBERON:000115092.97gold quality
hindlimb stylopod muscleUBERON:000425292.79gold quality
rectumUBERON:000105292.73gold quality
pancreasUBERON:000126492.67gold quality
skeletal muscle tissueUBERON:000113492.14gold quality
ganglionic eminenceUBERON:000402392.14gold quality
right adrenal gland cortexUBERON:003582792.12gold quality
right adrenal glandUBERON:000123391.87gold quality
mucosa of transverse colonUBERON:000499191.76gold quality
heart left ventricleUBERON:000208491.42gold quality
body of stomachUBERON:000116191.41gold quality
fundus of stomachUBERON:000116091.03gold quality
left ovaryUBERON:000211990.94gold quality
adult mammalian kidneyUBERON:000008290.93gold quality
left adrenal glandUBERON:000123490.92gold quality
muscle tissueUBERON:000238590.90gold quality
ovaryUBERON:000099290.84gold quality
duodenumUBERON:000211490.79gold quality
smooth muscle tissueUBERON:000113590.54gold quality
heartUBERON:000094890.47gold quality
left adrenal gland cortexUBERON:003582590.39gold quality
placentaUBERON:000198790.38gold quality
lymph nodeUBERON:000002990.21gold quality
adrenal glandUBERON:000236990.19gold quality
cortex of kidneyUBERON:000122590.10gold quality
stomachUBERON:000094590.02gold quality

Single-cell (SCXA)

Detected in 1 experiment(s), a significant marker in 1.

ExperimentMarker?Max mean expression
E-ANND-3yes5.32

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

33 targeting MRPL45, top 30 by miRDB confidence (max_score; target_count = how many genes the miRNA targets in total — lower means more specific):

miRNAMax scoreAvg scoremiRNA target_count
HSA-MIR-428299.9975.366408
HSA-MIR-807599.9767.20962
HSA-MIR-684499.8270.692423
HSA-MIR-94499.8270.853042
HSA-MIR-4668-5P99.7970.583782
HSA-MIR-6752-3P99.7266.711587
HSA-MIR-494-3P99.7071.452795
HSA-MIR-58799.6470.862611
HSA-MIR-5004-3P99.5468.271371
HSA-MIR-4728-3P99.4768.94981
HSA-MIR-6731-5P99.2867.422375
HSA-MIR-808599.2867.562362
HSA-MIR-5584-3P99.2368.791351
HSA-MIR-3925-5P99.2167.901466
HSA-MIR-146A-3P99.1368.991881
HSA-MIR-6871-5P98.9066.67671
HSA-MIR-6895-3P98.7965.69996
HSA-MIR-6830-3P98.6268.071760
HSA-MIR-211798.4867.971307
HSA-MIR-93-3P98.1566.651309
HSA-MIR-4769-3P97.9568.171002
HSA-MIR-6817-5P97.9567.861026
HSA-MIR-3151-3P97.8066.16479
HSA-MIR-30C-1-3P97.8066.361499
HSA-MIR-30C-2-3P97.8066.451499
HSA-MIR-6788-5P97.8066.411532
HSA-MIR-3620-3P97.7864.88772
HSA-MIR-6511A-3P97.6066.61713
HSA-MIR-6511B-3P97.6066.61713
HSA-MIR-4732-3P97.1565.45881

Functional genomics

DepMap (CRISPR cell-line fitness): dependent in 85.6% of screened cell lines.

Cross-species orthologs

5 orthologs

OrganismSymbolGene ID
danio_reriomrpl45ENSDARG00000044942
mus_musculusMrpl45ENSMUSG00000018882
rattus_norvegicusMrpl45ENSRNOG00000010540
drosophila_melanogastermRpL45FBGN0263863
caenorhabditis_elegansWBGENE00022493

Protein

Protein identifiers

Large ribosomal subunit protein mL45Q9BRJ2 (reviewed: Q9BRJ2)

Alternative names: 39S ribosomal protein L45, mitochondrial

All UniProt accessions (2): A0A087WU62, A0A087X2D5

UniProt curated annotations — full annotation on UniProt →

Function. Component of the mitochondrial large ribosomal subunit (mt-LSU). Within the mitochondrial ribosomes, required to direct the nascent polypeptide toward the tunnel exit and position the exit at a distance from the membrane surface.

Subunit / interactions. Component of the mitochondrial large ribosomal subunit (mt-LSU). Mature mammalian 55S mitochondrial ribosomes consist of a small (28S) and a large (39S) subunit. The 28S small subunit contains a 12S ribosomal RNA (12S mt-rRNA) and 30 different proteins. The 39S large subunit contains a 16S rRNA (16S mt-rRNA), a copy of mitochondrial valine transfer RNA (mt-tRNA(Val)), which plays an integral structural role, and 52 different proteins.

Subcellular location. Mitochondrion.

Similarity. Belongs to the mitochondrion-specific ribosomal protein mL45 family.

RefSeq proteins (2): NP_001265208, NP_115727* (*=MANE)

Domains & families (InterPro)

IDNameType
IPR007379Tim44-like_domDomain
IPR032710NTF2-like_dom_sfHomologous_superfamily
IPR051975mtLSU_mL45Family

Pfam: PF04280

UniProt features (23 total): strand 9, helix 6, turn 3, transit peptide 1, chain 1, region of interest 1, sequence variant 1, sequence conflict 1

Structure

Experimental structures (PDB)

85 structures, top 30 by resolution.

PDBMethodResolution (Å)
7OF0ELECTRON MICROSCOPY2.2
7QI4ELECTRON MICROSCOPY2.21
8RRIELECTRON MICROSCOPY2.4
8QU5ELECTRON MICROSCOPY2.42
9OLFELECTRON MICROSCOPY2.46
7OF7ELECTRON MICROSCOPY2.5
7PO4ELECTRON MICROSCOPY2.56
6ZM6ELECTRON MICROSCOPY2.59
7O9MELECTRON MICROSCOPY2.6
7OF6ELECTRON MICROSCOPY2.6
9CN3ELECTRON MICROSCOPY2.62
7QI5ELECTRON MICROSCOPY2.63
7OF2ELECTRON MICROSCOPY2.7
7OF3ELECTRON MICROSCOPY2.7
7OF4ELECTRON MICROSCOPY2.7
9PR4ELECTRON MICROSCOPY2.77
9PRAELECTRON MICROSCOPY2.83
8ANYELECTRON MICROSCOPY2.85
6ZM5ELECTRON MICROSCOPY2.89
7QH7ELECTRON MICROSCOPY2.89
7ODRELECTRON MICROSCOPY2.9
7OF5ELECTRON MICROSCOPY2.9
8K2AELECTRON MICROSCOPY2.9
8OITELECTRON MICROSCOPY2.9
9PGLELECTRON MICROSCOPY2.9
9PGFELECTRON MICROSCOPY2.93
6VMIELECTRON MICROSCOPY2.96
6VLZELECTRON MICROSCOPY2.97
7QI6ELECTRON MICROSCOPY2.98
9PSMELECTRON MICROSCOPY2.98

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q9BRJ2-F180.900.52

Function

Pathways and Gene Ontology

Reactome pathways

4 pathways

IDPathway
R-HSA-5368286Mitochondrial translation initiation
R-HSA-5389840Mitochondrial translation elongation
R-HSA-5419276Mitochondrial translation termination
R-HSA-9937383Mitochondrial ribosome-associated quality control

MSigDB gene sets: 146 (showing top): TGCGCANK_UNKNOWN, MIDORIKAWA_AMPLIFIED_IN_LIVER_CANCER, GOBP_MITOCHONDRIAL_TRANSLATION, CHANDRAN_METASTASIS_DN, GOBP_TRANSLATION, GOMF_STRUCTURAL_CONSTITUENT_OF_RIBOSOME, GGARNTKYCCA_UNKNOWN, GOCC_MITOCHONDRIAL_ENVELOPE, YAO_TEMPORAL_RESPONSE_TO_PROGESTERONE_CLUSTER_13, WONG_MITOCHONDRIA_GENE_MODULE, IVANOVA_HEMATOPOIESIS_EARLY_PROGENITOR, TGGAAA_NFAT_Q4_01, GOCC_LARGE_RIBOSOMAL_SUBUNIT, GOCC_RIBOSOME, GOCC_ORGANELLAR_RIBOSOME

GO Biological Process (1): mitochondrial translation (GO:0032543)

GO Molecular Function (2): RNA binding (GO:0003723), structural constituent of ribosome (GO:0003735)

GO Cellular Component (5): mitochondrion (GO:0005739), mitochondrial inner membrane (GO:0005743), mitochondrial large ribosomal subunit (GO:0005762), ribosome (GO:0005840), ribonucleoprotein complex (GO:1990904)

Reactome top-level categories

Rollup of top-1 pathways:

CategoryPathways
Mitochondrial translation4

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
mitochondrion1
translation1
mitochondrial gene expression1
nucleic acid binding1
structural molecule activity1
ribosome1
cytoplasm1
intracellular membrane-bounded organelle1
organelle inner membrane1
mitochondrial membrane1
organellar large ribosomal subunit1
mitochondrial ribosome1
mitochondrial protein-containing complex1
intracellular membraneless organelle1
protein-containing complex1

Protein interactions and networks

STRING

1456 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
MRPL45MRPL11Q9Y3B7742
MRPL45MRPS18BQ9Y676648
MRPL45MRPL48Q96GC5646
MRPL45MRPS22P82650641
MRPL45MRPL12P52815634
MRPL45MRPL53Q96EL3616
MRPL45MRPL49Q13405616
MRPL45TIMM44O43615607
MRPL45MRPS31Q92665607
MRPL45OXA1LQ15070588
MRPL45LRPPRCP42704579
MRPL45MRPL40Q9NQ50578
MRPL45MRPS27Q92552576
MRPL45MRPS18AQ9NVS2568
MRPL45DAP3P51398566

IntAct

84 interactions, top by confidence:

ABTypeScore
MRPL37HSPD1psi-mi:“MI:0914”(association)0.710
MRPS30GTPBP10psi-mi:“MI:0914”(association)0.640
TRIM23MRPL45psi-mi:“MI:0915”(physical association)0.560
MRPL45TRIM23psi-mi:“MI:0915”(physical association)0.560
CAVIN1MRPL45psi-mi:“MI:0915”(physical association)0.560
PFDN5MRPL45psi-mi:“MI:0915”(physical association)0.560
MRPL45PLEKHA3psi-mi:“MI:0915”(physical association)0.560
EMDMRPL45psi-mi:“MI:0915”(physical association)0.560
NPKPNA6psi-mi:“MI:0914”(association)0.550
MRPL50GTPBP10psi-mi:“MI:0914”(association)0.530
ZNF324BZNF316psi-mi:“MI:0914”(association)0.530
ZNF331USP9Ypsi-mi:“MI:0914”(association)0.530
MRPL10ZZEF1psi-mi:“MI:0914”(association)0.530
MRPL42GATCpsi-mi:“MI:0914”(association)0.530
RPL6MRPS14psi-mi:“MI:0914”(association)0.530
PDGFBDKC1psi-mi:“MI:0914”(association)0.530
MRPL28MRPL3psi-mi:“MI:0914”(association)0.530
MRPL41MRPL3psi-mi:“MI:0914”(association)0.530
NDUFAB1MIEF1psi-mi:“MI:0915”(physical association)0.490
Nup188RPS3psi-mi:“MI:0914”(association)0.350
Rpl35RPS6psi-mi:“MI:0914”(association)0.350
Pip4k2cLAMA5psi-mi:“MI:0914”(association)0.350
Dctn5VWA8psi-mi:“MI:0914”(association)0.350
NCAPD3SMC2psi-mi:“MI:0914”(association)0.350
MRPL50MRPL43psi-mi:“MI:0914”(association)0.350
MRPL9MRPL43psi-mi:“MI:0914”(association)0.350
MRPL1MRPL43psi-mi:“MI:0914”(association)0.350
FOXB1DDX39Apsi-mi:“MI:0914”(association)0.350
FOXL1DDX39Apsi-mi:“MI:0914”(association)0.350

ESM2 similar proteins: A3LYQ7, A5D9T6, A5DTQ6, A6ZML5, A6ZQJ9, A7TQZ1, B3LM44, B3LPY7, B5VL46, B5VPS9, C4QWY8, C4R8C9, C4XVT2, C4XW03, C4Y2I7, C5DKM2, C5DQ08, C5DV23, C7GPZ8, C7GQ96, C8ZB86, C8ZF15, O60186, O94618, P21560, P32453, P38300, P46956, P47015, P53266, P53736, P59480, Q02204, Q03798, Q04472, Q09218, Q09705, Q10275, Q3T142, Q4QQQ4

Diamond homologs: P59480, Q3T142, Q4QQQ4, Q616T6, Q95Y71, Q9BRJ2, Q9D0Q7, Q9VCX3

SIGNOR signaling

1 interactions.

AEffectBMechanism
MRPL45“form complex”“39S mitochondrial large ribosomal subunit”binding

Enriched among interaction partners

Reactome pathways and GO biological processes over-represented among this gene’s 101 IntAct physical interaction partners (hypergeometric vs the genome-wide background, BH-FDR, gene-set size 15–500, ranked by fold). A functional readout of the neighbourhood — distinct from this gene’s own memberships above, and biased toward well-studied / hub proteins, so read it as themes rather than proof.

Reactome pathways:

PathwayPartnersFoldFDR
Mitochondrial ribosome-associated quality control2645.0×4e-35
Mitochondrial translation initiation2442.9×5e-32
Mitochondrial translation elongation2442.9×5e-32
Mitochondrial translation2242.6×2e-29
Mitochondrial translation termination2437.1×2e-30
Translation2521.9×7e-26
Influenza Infection512.4×2e-03

GO biological processes:

GO termPartnersFoldFDR
mitochondrial translation2549.9×6e-34
translation1720.1×2e-15

Disease & clinical

Clinical variants and AI predictions

ClinVar

73 variants total. Per-class counts are floors (≥ shown; pagination cap):

ClassificationCount (floor)
Pathogenic0
Likely pathogenic0
Uncertain significance63
Likely benign3
Benign0

Top pathogenic / likely-pathogenic (0)

SpliceAI

1202 predictions. Top by Δscore:

VariantEffectΔscore
17:38298447:A:AGacceptor_gain1.0000
17:38298448:G:GGacceptor_gain1.0000
17:38298448:GCCA:Gacceptor_gain1.0000
17:38299349:A:AGacceptor_gain1.0000
17:38299349:AGCT:Aacceptor_gain1.0000
17:38299350:G:GGacceptor_gain1.0000
17:38299350:GCT:Gacceptor_gain1.0000
17:38299350:GCTG:Gacceptor_gain1.0000
17:38299464:GTGTC:Gdonor_gain1.0000
17:38299466:GTC:Gdonor_gain1.0000
17:38299469:G:GGdonor_gain1.0000
17:38306531:A:AGacceptor_gain1.0000
17:38306532:G:GGacceptor_gain1.0000
17:38306627:AATAA:Adonor_gain1.0000
17:38306628:A:Gdonor_gain1.0000
17:38306628:ATAA:Adonor_gain1.0000
17:38306629:TAA:Tdonor_gain1.0000
17:38306630:AA:Adonor_gain1.0000
17:38306631:AG:Adonor_loss1.0000
17:38306632:G:GGdonor_gain1.0000
17:38306633:TAA:Tdonor_loss1.0000
17:38320612:CCTTA:Cacceptor_loss1.0000
17:38320613:CTTA:Cacceptor_loss1.0000
17:38320614:TTAG:Tacceptor_loss1.0000
17:38320616:A:AGacceptor_gain1.0000
17:38320616:A:Cacceptor_loss1.0000
17:38320616:AG:Aacceptor_gain1.0000
17:38320617:G:Aacceptor_loss1.0000
17:38320617:G:GGacceptor_gain1.0000
17:38320617:GG:Gacceptor_gain1.0000

AlphaMissense

2006 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
17:38320654:T:AW183R0.998
17:38320654:T:CW183R0.998
17:38322240:T:AW259R0.998
17:38322240:T:CW259R0.998
17:38322147:T:CF228L0.996
17:38322149:T:AF228L0.996
17:38322149:T:GF228L0.996
17:38306612:G:CA148P0.995
17:38306591:G:CA141P0.994
17:38306592:C:AA141D0.994
17:38320751:G:CR215P0.994
17:38320766:A:CQ220P0.994
17:38322154:G:CR230P0.994
17:38322242:G:CW259C0.994
17:38322242:G:TW259C0.994
17:38318704:T:CL160P0.993
17:38322132:G:CA223P0.993
17:38320656:G:CW183C0.992
17:38320656:G:TW183C0.992
17:38322142:A:TD226V0.991
17:38322245:A:CR260S0.991
17:38322245:A:TR260S0.991
17:38306613:C:AA148D0.990
17:38318719:C:TT165I0.990
17:38320655:G:CW183S0.990
17:38306579:T:CF137L0.989
17:38306581:C:AF137L0.989
17:38306581:C:GF137L0.989
17:38306625:T:CL152P0.989
17:38318704:T:AL160H0.989

dbSNP variants (sampled 300 via entrez): RS1000020856 (17:38299846 C>T), RS1000033474 (17:38318037 A>G,T), RS1000392358 (17:38322346 T>G), RS1000401130 (17:38296460 A>C), RS1000433911 (17:38295350 A>G,T), RS1000486264 (17:38295596 G>C), RS1000624972 (17:38300990 T>G), RS1000766722 (17:38307122 G>A,C), RS1000999647 (17:38319217 A>G), RS1001013794 (17:38300761 A>G), RS1001071301 (17:38319613 G>A), RS1001434573 (17:38296513 G>A), RS1001491344 (17:38296747 G>C,T), RS1001621153 (17:38302266 C>A), RS1001768648 (17:38308587 C>T)

Disease associations

OMIM: gene MIM:611850 | disease phenotypes:

GenCC curated gene-disease

Mondo (0):

Orphanet (0):

HPO phenotypes

0 total (0 of 0 shown, HPO-id order):

GWAS associations

1 associations (top):

StudyTraitp-value
GCST001941_16Ovarian cancer8.000000e-10

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

PharmGKB: 1 entry (VIP=true, CPIC=false)

CTD chemical–gene interactions

35 total (human), top 30 by PubMed support.

ChemicalActions (top 5)PubMed papers
Valproic Acidaffects cotreatment, increases expression, affects expression, decreases expression4
sodium arsenitedecreases expression2
Thapsigarginincreases reaction, increases expression, decreases expression2
bisphenol Fincreases expression1
alpha phellandreneincreases expression1
bisphenol Aincreases expression1
nobiletindecreases expression, decreases reaction1
sodium arsenatedecreases expression, decreases reaction1
arseniteincreases reaction, affects binding1
caffeic aciddecreases expression, increases reaction1
2,3,5-(triglutathion-S-yl)hydroquinoneincreases ADP-ribosylation1
4-methoxycinnamate methyl esterdecreases expression, increases reaction1
CGP 52608affects binding, increases reaction1
Sunitinibincreases expression1
Acetaminophenaffects cotreatment, decreases expression1
Air Pollutantsaffects expression, increases abundance1
Air Pollutants, Occupationalaffects expression1
Atrazinedecreases expression1
Benzo(a)pyreneincreases methylation1
Copperaffects binding, decreases expression1
Disulfiramaffects binding, decreases expression1
Drugs, Chinese Herbaldecreases expression, increases reaction1
Hydralazineaffects cotreatment, increases expression1
Ivermectindecreases expression1
Leadaffects expression1
Lipopolysaccharidesaffects cotreatment, decreases expression1
Ozoneaffects expression, increases abundance1
Ribonucleotidesaffects binding1
Tobacco Smoke Pollutiondecreases methylation1
Tretinoindecreases expression1

Cellosaurus cell lines

16 cell lines: 16 cancer cell line

First 10 cell lines (id-ordered, not curated):

CellosaurusNameCategorySex
CVCL_0179BT-474Cancer cell lineFemale
CVCL_4V65BT474-5FU[r]Cancer cell lineFemale
CVCL_4Y08BT-474/CMV-LucCancer cell lineFemale
CVCL_A2GHLR-BT474Cancer cell lineFemale
CVCL_A4AKBT-474 Tam2Cancer cell lineFemale
CVCL_A4CLBT-474 Ecadherin EmGFPCancer cell lineFemale
CVCL_AQ07BT-474 Clone 5Cancer cell lineFemale
CVCL_AR86BT-474 Tam1Cancer cell lineFemale
CVCL_AR96BT-474 EEICancer cell lineFemale
CVCL_C9CUBT-474-Luc2Cancer cell lineFemale

Clinical trials (associated diseases)

0 trials via MONDO — disease-level, not drug-specific.

  • Disease cohort memberships (association, not causation — diseases whose associated-gene cohort lists this gene; a subset are also under Associated diseases): ovarian carcinoma