MAX (gene)

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MYC associated factor X

Max transcription factor (blue and green cartoons) bound to DNA. PDB rendering based on 1an2[1].
Available structures
PDB Ortholog search: PDBe, RCSB
Identifiers
SymbolsMAX; bHLHd4
External IDsOMIM: 154950 MGI: 96921 HomoloGene: 1786 ChEMBL: 1250363 GeneCards: MAX Gene
RNA expression pattern
More reference expression data
Orthologs
SpeciesHumanMouse
Entrez414917187
EnsemblENSG00000125952ENSMUSG00000059436
UniProtP61244P28574
RefSeq (mRNA)NM_001271068NM_001146176
RefSeq (protein)NP_001257997NP_001139648
Location (UCSC)Chr 14:
65.47 – 65.57 Mb		Chr 12:
76.94 – 76.96 Mb
PubMed search
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Protein max also known as myc-associated factor X is a protein that in humans is encoded by the MAX gene.[2][3]

Function

The protein max is a member of the basic helix-loop-helix leucine zipper (bHLHZ) family of transcription factors. It is able to form homodimers and heterodimers with other family members, which include Mad, Mxl1 and Myc. Myc is an oncoprotein implicated in cell proliferation, differentiation and apoptosis. The homodimers and heterodimers compete for a common DNA target site (the E-box) and rearrangement among these dimer forms provides a complex system of transcriptional regulation. Multiple alternatively spliced transcript variants have been described for this gene but the full-length nature for some of them is unknown.[3]

Max binds to itself and to other transcription factors through its leucine zipper to form homo- and hetero-dimers respectively. Max itself lacks a transactivation domain so that Max homodimers have a repressive function. In contrast, Myc contains a transactivation domain but cannot homodimerize. However Myc can heterodimerize with Max to form heterodimers that can both bind DNA and transactivate. The transcriptionally active Max/Myc dimer promotes cell proliferation as well as apoptosis.[4]

Interactions

MAX (gene) has been shown to interact with:

Clinical relevance

This gene has been shown mutated in cases of hereditary pheochromocytoma.[21] More recently the MAX gene has been show to be mutated also in small cell lung cancer (SCLC). This is mutually exclusive with alterations at MYC and BRG1, the latter coding for an ATPase of the SWI/SNF complex. It was demonstrated that BRG1 regulates the expression of MAX through direct recruitment to the MAX promoter, and that depletion of BRG1 strongly hinders cell growth, specifically in MAX-deficient cells, heralding a synthetic lethal interaction. Furthermore, MAX required BRG1 to activate neuroendocrine transcriptional programs and to up-regulate MYC-targets, such as glycolytic-related genes.[22]

References

  1. ↑ Ferré-d'Amaré, A. R.; Prendergast, G. C.; Ziff, E. B.; Burley, S. K. (1993). "Recognition by Max of its cognate DNA through a dimeric b/HLH/Z domain". Nature 363 (6424): 38–45. doi:10.1038/363038a0. PMID 8479534. 
  2. ↑ Wagner AJ, Le Beau MM, Diaz MO, Hay N (May 1992). "Expression, regulation, and chromosomal localization of the Max gene". Proc Natl Acad Sci U S A 89 (7): 3111–5. doi:10.1073/pnas.89.7.3111. PMC 48814. PMID 1557420. 
  3. ↑ 3.0 3.1 "Entrez Gene: MAX MYC associated factor X". 
  4. ↑ Amati B, Land H (February 1994). "Myc-Max-Mad: a transcription factor network controlling cell cycle progression, differentiation and death". Curr. Opin. Genet. Dev. 4 (1): 102–8. doi:10.1016/0959-437X(94)90098-1. PMID 8193530. 
  5. ↑ Ewing RM, Chu P, Elisma F, Li H, Taylor P, Climie S, McBroom-Cerajewski L, Robinson MD, O'Connor L, Li M, Taylor R, Dharsee M, Ho Y, Heilbut A, Moore L, Zhang S, Ornatsky O, Bukhman YV, Ethier M, Sheng Y, Vasilescu J, Abu-Farha M, Lambert JP, Duewel HS, Stewart II, Kuehl B, Hogue K, Colwill K, Gladwish K, Muskat B, Kinach R, Adams SL, Moran MF, Morin GB, Topaloglou T, Figeys D (2007). "Large-scale mapping of human protein-protein interactions by mass spectrometry". Mol. Syst. Biol. 3: 89. doi:10.1038/msb4100134. PMC 1847948. PMID 17353931. 
  6. ↑ 6.0 6.1 McMahon SB, Wood MA, Cole MD (January 2000). "The essential cofactor TRRAP recruits the histone acetyltransferase hGCN5 to c-Myc". Mol. Cell. Biol. 20 (2): 556–62. doi:10.1128/MCB.20.2.556-562.2000. PMC 85131. PMID 10611234. 
  7. ↑ 7.0 7.1 McMahon SB, Van Buskirk HA, Dugan KA, Copeland TD, Cole MD (August 1998). "The novel ATM-related protein TRRAP is an essential cofactor for the c-Myc and E2F oncoproteins". Cell 94 (3): 363–74. doi:10.1016/S0092-8674(00)81479-8. PMID 9708738. 
  8. ↑ Cheng SW, Davies KP, Yung E, Beltran RJ, Yu J, Kalpana GV (May 1999). "c-MYC interacts with INI1/hSNF5 and requires the SWI/SNF complex for transactivation function". Nat. Genet. 22 (1): 102–5. doi:10.1038/8811. PMID 10319872. 
  9. ↑ 9.0 9.1 Mac Partlin M, Homer E, Robinson H, McCormick CJ, Crouch DH, Durant ST, Matheson EC, Hall AG, Gillespie DA, Brown R (February 2003). "Interactions of the DNA mismatch repair proteins MLH1 and MSH2 with c-MYC and MAX". Oncogene 22 (6): 819–25. doi:10.1038/sj.onc.1206252. PMID 12584560. 
  10. ↑ 10.0 10.1 10.2 Blackwood, E M; Eisenman R N (Mar 1991). "Max: a helix-loop-helix zipper protein that forms a sequence-specific DNA-binding complex with Myc". Science (UNITED STATES) 251 (4998): 1211–7. doi:10.1126/science.2006410. ISSN 0036-8075. PMID 2006410. 
  11. ↑ 11.0 11.1 11.2 Lee CM, Onésime D, Reddy CD, Dhanasekaran N, Reddy EP (October 2002). "JLP: A scaffolding protein that tethers JNK/p38MAPK signaling modules and transcription factors". Proc. Natl. Acad. Sci. U.S.A. 99 (22): 14189–94. doi:10.1073/pnas.232310199. PMC 137859. PMID 12391307. 
  12. ↑ 12.0 12.1 Billin AN, Eilers AL, Queva C, Ayer DE (December 1999). "Mlx, a novel Max-like BHLHZip protein that interacts with the Max network of transcription factors". J. Biol. Chem. 274 (51): 36344–50. doi:10.1074/jbc.274.51.36344. PMID 10593926. 
  13. ↑ 13.0 13.1 Gupta K, Anand G, Yin X, Grove L, Prochownik EV (March 1998). "Mmip1: a novel leucine zipper protein that reverses the suppressive effects of Mad family members on c-myc". Oncogene 16 (9): 1149–59. doi:10.1038/sj.onc.1201634. PMID 9528857. 
  14. ↑ 14.0 14.1 14.2 Meroni G, Reymond A, Alcalay M, Borsani G, Tanigami A, Tonlorenzi R, Lo Nigro C, Messali S, Zollo M, Ledbetter DH, Brent R, Ballabio A, Carrozzo R (May 1997). "Rox, a novel bHLHZip protein expressed in quiescent cells that heterodimerizes with Max, binds a non-canonical E box and acts as a transcriptional repressor". EMBO J. 16 (10): 2892–906. doi:10.1093/emboj/16.10.2892. PMC 1169897. PMID 9184233. 
  15. ↑ 15.0 15.1 Nair SK, Burley SK (January 2003). "X-ray structures of Myc-Max and Mad-Max recognizing DNA. Molecular bases of regulation by proto-oncogenic transcription factors". Cell 112 (2): 193–205. doi:10.1016/S0092-8674(02)01284-9. PMID 12553908. 
  16. ↑ 16.0 16.1 16.2 16.3 FitzGerald MJ, Arsura M, Bellas RE, Yang W, Wu M, Chin L, Mann KK, DePinho RA, Sonenshein GE (April 1999). "Differential effects of the widely expressed dMax splice variant of Max on E-box vs initiator element-mediated regulation by c-Myc". Oncogene 18 (15): 2489–98. doi:10.1038/sj.onc.1202611. PMID 10229200. 
  17. ↑ Meroni G, Cairo S, Merla G, Messali S, Brent R, Ballabio A, Reymond A (July 2000). "Mlx, a new Max-like bHLHZip family member: the center stage of a novel transcription factors regulatory pathway?". Oncogene 19 (29): 3266–77. doi:10.1038/sj.onc.1203634. PMID 10918583. 
  18. ↑ Ayer DE, Kretzner L, Eisenman RN (January 1993). "Mad: a heterodimeric partner for Max that antagonizes Myc transcriptional activity". Cell 72 (2): 211–22. doi:10.1016/0092-8674(93)90661-9. PMID 8425218. 
  19. ↑ Rual JF, Venkatesan K, Hao T, Hirozane-Kishikawa T, Dricot A, Li N, Berriz GF, Gibbons FD, Dreze M, Ayivi-Guedehoussou N, Klitgord N, Simon C, Boxem M, Milstein S, Rosenberg J, Goldberg DS, Zhang LV, Wong SL, Franklin G, Li S, Albala JS, Lim J, Fraughton C, Llamosas E, Cevik S, Bex C, Lamesch P, Sikorski RS, Vandenhaute J, Zoghbi HY, Smolyar A, Bosak S, Sequerra R, Doucette-Stamm L, Cusick ME, Hill DE, Roth FP, Vidal M (October 2005). "Towards a proteome-scale map of the human protein-protein interaction network". Nature 437 (7062): 1173–8. doi:10.1038/nature04209. PMID 16189514. 
  20. ↑ Gupta MP, Amin CS, Gupta M, Hay N, Zak R (July 1997). "Transcription enhancer factor 1 interacts with a basic helix-loop-helix zipper protein, Max, for positive regulation of cardiac alpha-myosin heavy-chain gene expression". Mol. Cell. Biol. 17 (7): 3924–36. PMC 232245. PMID 9199327. 
  21. ↑ Comino-Méndez I, Gracia-Aznárez FJ, Schiavi F, Landa I, Leandro-García LJ, Letón R, Honrado E, Ramos-Medina R, Caronia D, Pita G, Gómez-Graña A, de Cubas AA, Inglada-Pérez L, Maliszewska A, Taschin E, Bobisse S, Pica G, Loli P, Hernández-Lavado R, Díaz JA, Gómez-Morales M, González-Neira A, Roncador G, Rodríguez-Antona C, Benítez J, Mannelli M, Opocher G, Robledo M, Cascón A (July 2011). "Exome sequencing identifies MAX mutations as a cause of hereditary pheochromocytoma". Nat. Genet. 43 (7): 663–7. doi:10.1038/ng.861. PMID 21685915. 
  22. ↑ Romero OA, Torres-Diz M, Pros E, Savola S, Gomez A, Moran S, Saez C, Iwakawa R, Villanueva A, Montuenga LM, Kohno T, Yokota J, Sanchez-Cespedes M. (Dec 2013). "MAX inactivation in small-cell lung cancer disrupts the MYC-SWI/SNF programs and is synthetic lethal with BRG1.". Cancer Discov. Epub ahead of print. PMID 24362264. 

Further reading

External links

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