InnateDB Protein
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IDBP-10144.6
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Last Modified
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2014-10-13 [Report errors or provide feedback]
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Gene Symbol
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MLST8
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Protein Name
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MTOR associated protein, LST8 homolog (S. cerevisiae)
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Synonyms
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Species
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Homo sapiens
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Ensembl Protein
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ENSP00000371888
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InnateDB Gene
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IDBG-10142 (MLST8)
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Protein Structure
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Function |
Subunit of both mTORC1 and mTORC2, which regulates cell growth and survival in response to nutrient and hormonal signals. mTORC1 is activated in response to growth factors or amino acids. Growth factor-stimulated mTORC1 activation involves a AKT1- mediated phosphorylation of TSC1-TSC2, which leads to the activation of the RHEB GTPase that potently activates the protein kinase activity of mTORC1. Amino acid-signaling to mTORC1 requires its relocalization to the lysosomes mediated by the Ragulator complex and the Rag GTPases. Activated mTORC1 up-regulates protein synthesis by phosphorylating key regulators of mRNA translation and ribosome synthesis. mTORC1 phosphorylates EIF4EBP1 and releases it from inhibiting the elongation initiation factor 4E (eiF4E). mTORC1 phosphorylates and activates S6K1 at 'Thr-389', which then promotes protein synthesis by phosphorylating PDCD4 and targeting it for degradation. Within mTORC1, LST8 interacts directly with MTOR and enhances its kinase activity. In nutrient- poor conditions, stabilizes the MTOR-RPTOR interaction and favors RPTOR-mediated inhibition of MTOR activity. mTORC2 is also activated by growth factors, but seems to be nutrient-insensitive. mTORC2 seems to function upstream of Rho GTPases to regulate the actin cytoskeleton, probably by activating one or more Rho-type guanine nucleotide exchange factors. mTORC2 promotes the serum- induced formation of stress-fibers or F-actin. mTORC2 plays a critical role in AKT1 'Ser-473' phosphorylation, which may facilitate the phosphorylation of the activation loop of AKT1 on 'Thr-308' by PDK1 which is a prerequisite for full activation. mTORC2 regulates the phosphorylation of SGK1 at 'Ser-422'. mTORC2 also modulates the phosphorylation of PRKCA on 'Ser-657'. {ECO:0000269PubMed:12718876, ECO:0000269PubMed:15467718}.
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Subcellular Localization |
Cytoplasm {ECO:0000250}.
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Disease Associations |
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Tissue Specificity |
Broadly expressed, with highest levels in skeletal muscle, heart and kidney. {ECO:0000269PubMed:12408816}.
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Comments |
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Number of Interactions
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This gene and/or its encoded proteins are associated with 46 experimentally validated interaction(s) in this database.
They are also associated with 4 interaction(s) predicted by orthology.
Experimentally validated |
Total |
46
[view]
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Protein-Protein |
46
[view]
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Protein-DNA |
0
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Protein-RNA |
0
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DNA-DNA |
0
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RNA-RNA |
0
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DNA-RNA |
0
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Predicted by orthology |
Total |
4 [view]
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Molecular Function |
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Biological Process |
GO:0007173
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epidermal growth factor receptor signaling pathway
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GO:0008286
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insulin receptor signaling pathway
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GO:0008543
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fibroblast growth factor receptor signaling pathway
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GO:0031295
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T cell costimulation
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GO:0032008
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positive regulation of TOR signaling
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GO:0032956
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regulation of actin cytoskeleton organization
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GO:0038095
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Fc-epsilon receptor signaling pathway
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GO:0045087
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innate immune response (InnateDB)
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GO:0048011
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neurotrophin TRK receptor signaling pathway
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GO:0048015
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phosphatidylinositol-mediated signaling
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Cellular Component |
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PDB ID |
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InterPro |
IPR001680
WD40 repeat
IPR017986
WD40-repeat-containing domain
IPR020472
G-protein beta WD-40 repeat
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PFAM |
PF00400
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PRINTS |
PR00320
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PIRSF |
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SMART |
SM00320
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TIGRFAMs |
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Modification |
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SwissProt |
Q9BVC4
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PhosphoSite |
PhosphoSite-Q9BVC4
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TrEMBL |
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UniProt Splice Variant |
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Entrez Gene |
64223
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UniGene |
Hs.691112
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RefSeq |
NP_001186104
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HUGO |
HGNC:24825
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OMIM |
612190
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CCDS |
CCDS58409
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HPRD |
17031
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IMGT |
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EMBL |
AC009065
AF195883
AK021536
AK022227
AK302201
AY223837
BC001313
BC017119
BC052292
BC088354
CH471112
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GenPept |
AAF04308
AAH01313
AAH17119
AAH52292
AAH88354
AAO73410
BAB13990
BAG51036
BAG63562
EAW85538
EAW85539
EAW85541
EAW85542
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