Q9BVC4 (LST8_HUMAN) Reviewed, UniProtKB/Swiss-Prot
Last modified
January 25, 2012.
Version 81.
History...
Names·Attributes·General annotation·Ontologies·Interactions·Alt products·Sequence annotation·Sequences·References·Cross-refs·Entry info·DocumentsCustomize order
Names·Attributes·General annotation·Ontologies·Interactions·Alt products·Sequence annotation·Sequences·References·Cross-refs·Entry info·DocumentsCustomize orderNames and origin
| Protein names | Recommended name: Target of rapamycin complex subunit LST8 Short name=TORC subunit LST8 Alternative name(s): G protein beta subunit-like Short name=Gable Short name=Protein GbetaL Mammalian lethal with SEC13 protein 8 Short name=mLST8 | ||||
| Gene names |
| ||||
| Organism | Homo sapiens (Human) | ||||
| Taxonomic identifier | 9606 [NCBI] | ||||
| Taxonomic lineage | Eukaryota › Metazoa › Chordata › Craniata › Vertebrata › Euteleostomi › Mammalia › Eutheria › Euarchontoglires › Primates › Haplorrhini › Catarrhini › Hominidae › Homo |
Protein attributes
| Sequence length | 326 AA. |
| Sequence status | Complete. |
| Protein existence | Evidence at protein level |
General annotation (Comments)
| 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'. Ref.8 Ref.10 |
| Subunit structure | Part of the mammalian target of rapamycin complex 1 (mTORC1) which contains MTOR, MLST8, RPTOR, AKT1S1/PRAS40 and DEPTOR. mTORC1 binds to and is inhibited by FKBP12-rapamycin. Part of the mammalian target of rapamycin complex 2 (mTORC2) which contains MTOR, MLST8, PRR5, RICTOR, MAPKAP1 and DEPTOR. Contrary to mTORC1, mTORC2 does not bind to and is not sensitive to FKBP12-rapamycin. Interacts directly with MTOR and RPTOR. Interacts with RHEB. Ref.7 Ref.8 Ref.11 |
| Subcellular location | Cytoplasm By similarity. |
| Tissue specificity | Broadly expressed, with highest levels in skeletal muscle, heart and kidney. Ref.7 |
| Sequence similarities | Belongs to the WD repeat LST8 family. Contains 7 WD repeats. |
| Sequence caution | The sequence EAW85539.1 differs from that shown. Reason: Erroneous gene model prediction. |
Ontologies
| Keywords | |
|---|---|
| Cellular component | Cytoplasm |
| Coding sequence diversity | Alternative splicing |
| Domain | Repeat WD repeat |
| PTM | Phosphoprotein |
| Technical term | Complete proteome Reference proteome |
| Gene Ontology (GO) | |
| Biological process | T cell costimulation Traceable author statement. Source: Reactome fibroblast growth factor receptor signaling pathwayTraceable author statement. Source: Reactome insulin receptor signaling pathwayTraceable author statement. Source: Reactome nerve growth factor receptor signaling pathwayTraceable author statement. Source: Reactome phosphatidylinositol-mediated signalingTraceable author statement. Source: Reactome positive regulation of TOR signaling cascadeInferred from mutant phenotype Ref.10. Source: UniProtKB |
| Cellular component | cytosol Traceable author statement. Source: Reactome |
| Molecular function | protein binding Inferred from physical interaction Ref.12. Source: IntAct |
| Complete GO annotation... | |
Binary interactions
With | Entry | #Exp. | IntAct | Notes |
|---|---|---|---|---|
| MTOR | P42345 | 4 | EBI-1387471,EBI-359260 | |
| RPTOR | Q8N122 | 3 | EBI-1387471,EBI-1567928 |
Alternative products
| This entry describes 3 isoforms produced by alternative splicing. [Align] [Select] | ||||||
| Isoform 1 (identifier: Q9BVC4-1) This isoform has been chosen as the 'canonical' sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry. | ||||||
| Isoform 2 (identifier: Q9BVC4-3) The sequence of this isoform differs from the canonical sequence as follows: 1-66: Missing. | ||||||
| Isoform 3 (identifier: Q9BVC4-4) The sequence of this isoform differs from the canonical sequence as follows: 1-1: M → MEHAPWSPGASSRARAGHTM 192-198: GNCYVWN → APRHLLG 199-326: Missing. | ||||||
| Note: Phosphorylated on Ser-7. |
Sequence annotation (Features)
| Feature key | Position(s) | Length | Description | Graphical view | Feature identifier | ||||
Molecule processing | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Chain | 1 – 326 | 326 | Target of rapamycin complex subunit LST8 | PRO_0000326499 | |||||
Regions | |||||||||
| Repeat | 1 – 37 | 37 | WD 1 | ||||||
| Repeat | 40 – 80 | 41 | WD 2 | ||||||
| Repeat | 83 – 122 | 40 | WD 3 | ||||||
| Repeat | 126 – 165 | 40 | WD 4 | ||||||
| Repeat | 168 – 207 | 40 | WD 5 | ||||||
| Repeat | 218 – 257 | 40 | WD 6 | ||||||
| Repeat | 268 – 309 | 42 | WD 7 | ||||||
Amino acid modifications | |||||||||
| Modified residue | 3 | 1 | Phosphothreonine Ref.15 | ||||||
| Modified residue | 4 | 1 | Phosphoserine Ref.14 Ref.15 | ||||||
| Modified residue | 7 | 1 | Phosphothreonine Ref.14 Ref.15 | ||||||
Natural variations | |||||||||
| Alternative sequence | 1 – 66 | 66 | Missing in isoform 2. | VSP_032665 | |||||
| Alternative sequence | 1 | 1 | M → MEHAPWSPGASSRARAGHTM in isoform 3. | VSP_032666 | |||||
| Alternative sequence | 192 – 198 | 7 | GNCYVWN → APRHLLG in isoform 3. | VSP_032667 | |||||
| Alternative sequence | 199 – 326 | 128 | Missing in isoform 3. | VSP_032668 | |||||
Experimental info | |||||||||
| Mutagenesis | 72 | 1 | S → D: Impairs interaction with MTOR. Ref.8 | ||||||
| Mutagenesis | 192 | 1 | G → D: Abolishes interaction with MTOR. Ref.8 | ||||||
| Mutagenesis | 320 | 1 | F → S: Impairs interaction with MTOR. Ref.8 | ||||||
| Sequence conflict | 44 | 1 | Missing in BAG51036. Ref.2 | ||||||
| Sequence conflict | 56 | 1 | M → V in BAB13990. Ref.2 | ||||||
| Sequence conflict | 153 | 1 | H → Y in AAH88354. Ref.5 | ||||||
| Sequence conflict | 248 | 1 | R → G in AAO73410. Ref.1 | ||||||
Sequences
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References
| « Hide 'large scale' references | |
| [1] | "Cloning and characterization of human LST8 gene." Mao Y., Li Y., Xie Y., Huo K., Hu Q. Submitted (JAN-2003) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM 2). |
| [2] | "Complete sequencing and characterization of 21,243 full-length human cDNAs." Ota T., Suzuki Y., Nishikawa T., Otsuki T., Sugiyama T., Irie R., Wakamatsu A., Hayashi K., Sato H., Nagai K., Kimura K., Makita H., Sekine M., Obayashi M., Nishi T., Shibahara T., Tanaka T., Ishii S. Sugano S.Nat. Genet. 36:40-45(2004) [PubMed: 14702039] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORMS 2 AND 3). Tissue: Embryo, Mammary gland and Testis. |
| [3] | "The sequence and analysis of duplication-rich human chromosome 16." Martin J., Han C., Gordon L.A., Terry A., Prabhakar S., She X., Xie G., Hellsten U., Chan Y.M., Altherr M., Couronne O., Aerts A., Bajorek E., Black S., Blumer H., Branscomb E., Brown N.C., Bruno W.J. Pennacchio L.A.Nature 432:988-994(2004) [PubMed: 15616553] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. |
| [4] | Mural R.J., Istrail S., Sutton G.G., Florea L., Halpern A.L., Mobarry C.M., Lippert R., Walenz B., Shatkay H., Dew I., Miller J.R., Flanigan M.J., Edwards N.J., Bolanos R., Fasulo D., Halldorsson B.V., Hannenhalli S., Turner R. Venter J.C.Submitted (SEP-2005) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. |
| [5] | "The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC)." The MGC Project Team Genome Res. 14:2121-2127(2004) [PubMed: 15489334] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORM 1). Tissue: Lymph, Placenta, Skin and Uterus. |
| [6] | "A novel G protein beta subunit (G beta 6) in human promyelocytic leukemia (HL-60) cells." Ramachandiran S., Lau S.S., Monks T.J. Submitted (OCT-1999) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [MRNA] OF 97-326 (ISOFORMS 1/2). Tissue: Promyelocytic leukemia. |
| [7] | "Two TOR complexes, only one of which is rapamycin sensitive, have distinct roles in cell growth control." Loewith R., Jacinto E., Wullschleger S., Lorberg A., Crespo J.L., Bonenfant D., Oppliger W., Jenoe P., Hall M.N. Mol. Cell 10:457-468(2002) [PubMed: 12408816] [Abstract] Cited for: INTERACTION WITH MTOR AND RPTOR, IDENTIFICATION IN THE TORC1 COMPLEX, TISSUE SPECIFICITY. |
| [8] | "GbetaL, a positive regulator of the rapamycin-sensitive pathway required for the nutrient-sensitive interaction between raptor and mTOR." Kim D.-H., Sarbassov D.D., Ali S.M., Latek R.R., Guntur K.V.P., Erdjument-Bromage H., Tempst P., Sabatini D.M. Mol. Cell 11:895-904(2003) [PubMed: 12718876] [Abstract] Cited for: FUNCTION, INTERACTION WITH MTOR, IDENTIFICATION IN THE TORC1 COMPLEX, MUTAGENESIS OF SER-72; GLY-192 AND PHE-320, MASS SPECTROMETRY. |
| [9] | "Rictor, a novel binding partner of mTOR, defines a rapamycin-insensitive and raptor-independent pathway that regulates the cytoskeleton." Sarbassov D.D., Ali S.M., Kim D.-H., Guertin D.A., Latek R.R., Erdjument-Bromage H., Tempst P., Sabatini D.M. Curr. Biol. 14:1296-1302(2004) [PubMed: 15268862] [Abstract] Cited for: IDENTIFICATION IN THE TORC1 AND TORC2 COMPLEXES. |
| [10] | "Mammalian TOR complex 2 controls the actin cytoskeleton and is rapamycin insensitive." Jacinto E., Loewith R., Schmidt A., Lin S., Ruegg M.A., Hall A., Hall M.N. Nat. Cell Biol. 6:1122-1128(2004) [PubMed: 15467718] [Abstract] Cited for: IDENTIFICATION IN THE TORC2 COMPLEX, FUNCTION. |
| [11] | "Rheb binds and regulates the mTOR kinase." Long X., Lin Y., Ortiz-Vega S., Yonezawa K., Avruch J. Curr. Biol. 15:702-713(2005) [PubMed: 15854902] [Abstract] Cited for: INTERACTION WITH RHEB. |
| [12] | "Identification of Protor as a novel Rictor-binding component of mTOR complex-2." Pearce L.R., Huang X., Boudeau J., Pawlowski R., Wullschleger S., Deak M., Ibrahim A.F.M., Gourlay R., Magnuson M.A., Alessi D.R. Biochem. J. 405:513-522(2007) [PubMed: 17461779] [Abstract] Cited for: IDENTIFICATION IN THE TORC2 COMPLEX. |
| [13] | "PRAS40 regulates mTORC1 kinase activity by functioning as a direct inhibitor of substrate binding." Wang L., Harris T.E., Roth R.A., Lawrence J.C. Jr. J. Biol. Chem. 282:20036-20044(2007) [PubMed: 17510057] [Abstract] Cited for: IDENTIFICATION IN THE TORC1 AND TORC2 COMPLEXES. |
| [14] | "Kinase-selective enrichment enables quantitative phosphoproteomics of the kinome across the cell cycle." Daub H., Olsen J.V., Bairlein M., Gnad F., Oppermann F.S., Korner R., Greff Z., Keri G., Stemmann O., Mann M. Mol. Cell 31:438-448(2008) [PubMed: 18691976] [Abstract] Cited for: PHOSPHORYLATION [LARGE SCALE ANALYSIS] AT SER-4, PHOSPHORYLATION [LARGE SCALE ANALYSIS] AT SER-7 (ISOFORM 3), MASS SPECTROMETRY. Tissue: Cervix carcinoma. |
| [15] | "Large-scale proteomics analysis of the human kinome." Oppermann F.S., Gnad F., Olsen J.V., Hornberger R., Greff Z., Keri G., Mann M., Daub H. Mol. Cell. Proteomics 8:1751-1764(2009) [PubMed: 19369195] [Abstract] Cited for: PHOSPHORYLATION [LARGE SCALE ANALYSIS] AT THR-3; SER-4 AND THR-7, PHOSPHORYLATION [LARGE SCALE ANALYSIS] AT SER-7 (ISOFORM 3), MASS SPECTROMETRY. |
| + | Additional computationally mapped references. |
Cross-references
Sequence databases | |
|---|---|
| EMBL GenBank DDBJ | AY223837 mRNA. Translation: AAO73410.1. AK021536 mRNA. Translation: BAG51036.1. AK022227 mRNA. Translation: BAB13990.1. AK302201 mRNA. Translation: BAG63562.1. AC009065 Genomic DNA. No translation available. CH471112 Genomic DNA. Translation: EAW85538.1. CH471112 Genomic DNA. Translation: EAW85539.1. Sequence problems. CH471112 Genomic DNA. Translation: EAW85541.1. CH471112 Genomic DNA. Translation: EAW85542.1. BC001313 mRNA. Translation: AAH01313.1. BC017119 mRNA. Translation: AAH17119.1. BC052292 mRNA. Translation: AAH52292.1. BC088354 mRNA. Translation: AAH88354.1. AF195883 mRNA. Translation: AAF04308.1. |
| IPI | IPI00007182. IPI00102926. IPI00420058. |
| RefSeq | NP_001186102.1. NM_001199173.1. NP_001186103.1. NM_001199174.1. NP_001186104.1. NM_001199175.1. NP_071767.3. NM_022372.4. |
| UniGene | Hs.29203. |
3D structure databases | |
| ProteinModelPortal | Q9BVC4. |
| SMR | Q9BVC4. Positions 5-323. |
| ModBase | Search... |
Protein-protein interaction databases | |
| IntAct | Q9BVC4. 15 interactions. |
| STRING | Q9BVC4. |
PTM databases | |
| PhosphoSite | Q9BVC4. |
Polymorphism databases | |
| DMDM | 74761285. |
Proteomic databases | |
| PRIDE | Q9BVC4. |
Protocols and materials databases | |
| StructuralBiologyKnowledgebase | Search... |
Genome annotation databases | |
| Ensembl | ENST00000382450; ENSP00000371888; ENSG00000167965. ENST00000397124; ENSP00000380313; ENSG00000167965. |
| GeneID | 64223. |
| KEGG | hsa:64223. |
| UCSC | uc002coy.2. human. uc002coz.1. human. uc002cpb.1. human. |
Organism-specific databases | |
| CTD | 64223. |
| GeneCards | GC16P002255. |
| H-InvDB | HIX0012725. |
| HGNC | HGNC:24825. MLST8. |
| HPA | CAB019935. |
| MIM | 612190. gene. |
| neXtProt | NX_Q9BVC4. |
| PharmGKB | PA165450213. |
| GenAtlas | Search... |
Phylogenomic databases | |
| eggNOG | prNOG09047. |
| GeneTree | ENSGT00390000014795. |
| HOVERGEN | HBG054763. |
| OMA | NNKGNCY. |
| OrthoDB | EOG4TXBS3. |
| PhylomeDB | Q9BVC4. |
Enzyme and pathway databases | |
| Pathway_Interaction_DB | pi3kciaktpathway. Class I PI3K signaling events mediated by Akt. mtor_4pathway. mTOR signaling pathway. |
| Reactome | REACT_111102. Signal Transduction. REACT_6900. Immune System. |
Gene expression databases | |
| ArrayExpress | Q9BVC4. |
| Bgee | Q9BVC4. |
| Genevestigator | Q9BVC4. |
Family and domain databases | |
| InterPro | IPR020472. G-protein_beta_WD-40_rep. IPR015943. WD40/YVTN_repeat-like_dom. IPR001680. WD40_repeat. IPR011046. WD40_repeat-like_dom. IPR019775. WD40_repeat_CS. IPR017986. WD40_repeat_dom. [Graphical view] |
| Gene3D | G3DSA:2.130.10.10. WD40/YVTN_repeat-like. 1 hit. |
| KO | K08266. |
| Pfam | PF00400. WD40. 7 hits. [Graphical view] |
| PRINTS | PR00320. GPROTEINBRPT. |
| SMART | SM00320. WD40. 6 hits. [Graphical view] |
| SUPFAM | SSF50978. WD40_like. 1 hit. |
| PROSITE | PS00678. WD_REPEATS_1. 1 hit. PS50082. WD_REPEATS_2. 3 hits. PS50294. WD_REPEATS_REGION. 1 hit. [Graphical view] |
| ProtoNet | Search... |
Other | |
| NextBio | 66155. |
| SOURCE | Search... |
Entry information
| Entry name | LST8_HUMAN | ||||||||
| Accession | Primary (citable) accession number: Q9BVC4 Secondary accession number(s): B3KMM4 Q9UJV6 | ||||||||
| Entry history |
| ||||||||
| Entry status | Reviewed (UniProtKB/Swiss-Prot) | ||||||||
| Annotation program | Chordata Protein Annotation Program | ||||||||
| Disclaimer | Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care. | ||||||||
Relevant documents
| Human chromosome 16 Human chromosome 16: entries, gene names and cross-references to MIM |
| MIM cross-references Online Mendelian Inheritance in Man (MIM) cross-references in UniProtKB/Swiss-Prot |
| SIMILARITY comments Index of protein domains and families |

Clusters with