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FOX proteins



Forkhead box proteins (FOX proteins) are a family of transcription factors that play important roles in regulating the expression of genes involved in cell growth, proliferation, differentiation, and longevity. Many FOX proteins are important to embryonic development.


The defining feature of FOX proteins is the forkhead box, a sequence of 80 to 100 amino acids forming a motif that binds to DNA. This forkhead motif is also known as the winged helix due to the butterfly-like appearance of the loops in the protein structure of the domain.[1] Forkhead genes are a subgroup of the helix-turn-helix class of proteins.

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Contents

Biological roles

Many other genes encoding FOX proteins have been identified. For example, the FOXF2 gene encodes forkhead box F2, one of many human homologues of the Drosophila melanogaster transcription factor forkhead. FOXF2 is expressed in lung and placenta.

Some FOX genes are downstream targets of the hedgehog signaling pathway, which plays a role in the development of basal cell carcinomas.

History

The first protein in the FOX family that was discovered was the fork head transcription factor in Drosophila (thus the name). Since then a large number of family members have been discovered, especially in vertebrates. Originally they were given vastly different names (such as HFH, FREAC, and fkh), but in 2000 a unified nomenclature was introduced that grouped the FOX proteins into subclasses (FOXA-FOXS) based on sequence conservation.[2]

Genes

  • FOXA1, FOXA2, FOXA3 (See also Hepatocyte nuclear factors)
  • FOXB1, FOXB2
  • FOXC1, FOXC2
  • FOXD1, FOXD2, FOXD3, FOXD4, FOXD5, FOXPD6
  • FOXE1, FOXE2, FOXE3
  • FOXF1, FOXF2
  • FOXG1
  • FOXH1
  • FOXI1, FOXI2
  • FOXJ1, FOXJ2, FOXJ3
  • FOXK1, FOXK2
  • FOXL1, FOXL2
  • FOXM1
  • FOXN1, FOXN2, FOXN3, FOXN4
  • FOXO1, FOXO2, FOXO3, FOXO4
  • FOXP1, FOXP2, FOXP3, FOXP4
  • FOXQ1
  • FOXR1, FOXR2

References

  1. ^ Lehmann OJ, Sowden JC, Carlsson P, Jordan T, Bhattacharya SS (2003). "Fox's in development and disease". TRENDS in Genetics 19 (6): 339-344. PMID 12801727.
  2. ^ Kaestner KH, Knochel W, Martinez DE (2000). "Unified nomenclature for the winged helix/forkhead transcription factors.". Genes and Development 14: 142-146. PMID 10702024.

Further reading

  • Tuteja G, Kaestner KH (2007). "SnapShot: Forkhead Transcription Factors I.". Cell 130: 1160-1160e1.
  • Tuteja G, Kaestner KH (2007). "SnapShot: Forkhead Transcription Factors II.". Cell 131: 192-192e1.


v • d • e
Transcription factors and intracellular receptors
(1) Basic domains
(1.1) Basic leucine zipper (bZIP) Activating transcription factor (1, 2, 3, 4, 5, 6) • AP-1 (c-Fos, FOSB, FOSL1, FOSL2, c-Jun, JUNB, JUND) • BACH (1, 2) • C/EBP (α, β, γ, δ, ε, ζ) • CREB (1, 3) • GABPA • MAF (B, F, G, K) • NRL • NRF1 • XBP1
(1.2) Basic helix-loop-helix (bHLH) ATOH1 • AhR • AHRR • ARNT • ASCL1 • BMAL (ARNTL, ARNTL2) • CLOCK • HIF (1A, 3A) • Myogenic regulatory factors (MyoD, Myogenin, MYF5, MYF6) • NEUROD1 • Twist • USF1
(1.3) bHLH-ZIP Myc • MITF • SREBP (1, 2)
(1.6) Basic helix-span-helix (bHSH) AP-2
(2) Zinc finger
DNA-binding domains
(2.1) Nuclear receptor (Cys4) subfamily 1 (Thyroid hormone (α, β), CAR, FXR, LXR (α, β), PPAR (α, β/δ, γ), PXR, RAR (α, β, γ), ROR (α, β, γ), Rev-ErbA (α, β), VDR) • subfamily 2 (COUP-TF (I, II), Ear-2, HNF4 (α, γ), PNR, RXR (α, β, γ), Testicular receptor (2, 4), TLX) • subfamily 3 (Steroid hormone (Estrogen (α, β), Estrogen related (α, β, γ), Androgen, Glucocorticoid, Mineralocorticoid, Progesterone)) • subfamily 4 NUR (NGFIB, NOR1, NURR1) • subfamily 5 (LRH-1, SF1) • subfamily 6 (GCNF) • subfamily 0 (DAX1, SHP)
(2.2) Other Cys4 GATA (1, 2, 3, 4, 5, 6)
(2.3) Cys2His2 General transcription factors (TFIIA, TFIIB, TFIID, TFIIE, TFIIF, TFIIH: 1, 2) • GLI-Krüppel family (1, 2, 3, YY1) • KLF (2, 4, 5, 6, 10, 11, 12, 13) • Sp1 • zinc finger (3, 35, 43, 146, 148, 165, 217, 268, 281, 350) • Zbtb7 (7A) • ZBT (16, 17, 33)
(2.4) Cys6 HIVEP1
(3) Helix-turn-helix
domains
(3.1) Homeo domain ARX • Homeobox (A1, A3, A4, A5, A7, A9, A10, A11, A13, B1, B2, B3, B4, B5, B6, B7, B8, B9, B13, C4, C6, C8, C9, C13, D1, D3, D4, D9, D10, D11, D12, D13) • NANOG • NKX (2-1, 2-5, 3-1) • POU domain (PIT-1, BRN-3: 1, 2, Octamer transcription factor: 1, 2, 3/4, 6, 7)
(3.2) Paired box PAX (1, 2, 3, 4, 5, 6, 7, 8, 9)
(3.3) Fork head / winged helix E2F (1, 2, 3, 4, 5) • FOX proteins (C1, C2, E1, G1, H1, L2, M1, N3, O3, O4, P1, P2, P3)
(3.4) Heat Shock Factors HSF1
(3.5) Tryptophan clusters ELF (4, 5) • Interferon regulatory factors (1, 2, 3, 4, 5, 6, 7, 8) • MYB
(3.6) TEA domain transcriptional enhancer factor 1, 2
(4) β-Scaffold factors with
minor groove contacts
(4.1) Rel homology region NF-κB (NFKB1, NFKB2, REL, RELA, RELB) • NFAT (5, C1, C2, C3, C4)
(4.2) STAT STAT (1, 2, 3, 4, 5, 6)
(4.3) p53 p53
(4.4) MADS box Mef2 (A, B, C, D) • SRF
(4.7) High mobility group HNF (1A, 1B) • LEF1 • SOX (3, 4, 6, 9, 10, 13, 18) • SRY • SSRP1
(4.10) Cold-shock domain CSDA
(4.11) Runt CBF (RUNX1, RUNX2, RUNX3)
(0) Other
transcription factors
(0.2) HMGI(Y) HMGA (1, 2)
(0.3) Pocket domain Rb • RBL1 • RBL2
(0.6) Miscellaneous ARID (1A, 1B, 2, 3A, 3B, 4A) • CAP • Rho/Sigma • R-SMAD
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "FOX_proteins". A list of authors is available in Wikipedia.
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