White Collar-1

Last updated
White Collar-1
Identifiers
Organism N. crassa
Symbolwc-1
Entrez 3875924
RefSeq (mRNA) XM_011396849
RefSeq (Prot) XP_011395151
UniProt Q01371
Search for
Structures Swiss-model
Domains InterPro

White Collar-1 (wc-1) is a gene in Neurospora crassa encoding the protein WC-1 (127 kDa). [1] [2] WC-1 has two separate roles in the cell. First, it is the primary photoreceptor for Neurospora [3] and the founding member of the class of principle blue light photoreceptors in all of the fungi. [4] Second, it is necessary for regulating circadian rhythms in FRQ. It is a key component of a circadian molecular pathway that regulates many behavioral activities, including conidiation. [5] [6] WC-1 and WC-2, an interacting partner of WC-1, comprise the White Collar Complex (WCC) that is involved in the Neurospora circadian clock. WCC is a complex of nuclear transcription factor proteins, and contains transcriptional activation domains, PAS domains, and zinc finger DNA-binding domains (GATA). [7] WC-1 and WC-2 heterodimerize through their PAS domains to form the White Collar Complex (WCC). [8] [9]

Contents

Discovery

The Neurospora circadian clock was discovered in 1959, when Pittendrigh et al. first described timing patterns in the asexual development of spores. [10] They noticed that in the region of the growing front, mycelia laid down between the late night to early morning formed aerial hyphae, whereas those laid down at other times did not. [10] [11] This aerial growth pattern at subjective circadian times served as tentative support for the presence of circadian oscillators.

White Collar-1 was described in the 1960s by geneticists who saw a strain of Neurospora which the mycelia were albino, but the conidia were normally pigmented. [12]

The mutant gene was designated white collar (wc), for the white coloration of the mycelia below the pigmented conidia on agar slants. [13] The gene wc-1 was classified during the mapping of the chromosomal loci of Neurospora crassa (1982 by Perkins et al.). [14]

Protein structure

WC-1 and WC-2 are transcription factors encoded by the genes wc-1 and wc-2. Zinc finger DNA-binding domains (GATA) allow WC-1 and WC-2 to bind to DNA and act as transcription factors. [1] [8]

Both WC-1 and WC-2 have PAS domains that allow them to bind to other proteins. [10] [15] WC-1 and WC-2 typically heterodimerize in vivo to form the White Collar Complex (WCC), which acts as a transcription factor complex. In vitro, WC-1 can also homodimerize with itself and heterodimerize with other PAS proteins. [10]

Protein sequencing has revealed WC-1 to also contain a LOV domain, a chromophore-binding peptide region. [2] [16] This binding site is highly conserved, and is sequentially similar to the chromophore-binding domains of phototropins in plants. [17]

WC-1 and WC-2 bind to the promoter elements of the genes that they transcriptionally activate. [3] [10]

Function in the circadian clock

Photoreception

WC-1 has been shown to be a blue-light photoreceptor, and is a necessary component of the Neurospora light-induced response pathway. [3] Genetic screens of light-insensitive Neurospora mutant strains have repeatedly demonstrated abnormalities in the wc-1 gene. [16] In functional Neurospora, the WC-1 LOV domain binds to the flavin adenine dinucleotide (FAD) chromophore, [3] [18] which is responsible for the conversion of light to mechanical energy. FAD displays maximum absorption of light at 450 nm, [19] thus explaining WC-1's maximal sensitivity to blue light.

Light-induced responses are completely eliminated in WC-1 LOV knockout Neurospora mutants, although WC-1's transcription activation role persists in the dark. [16] WC-1 is widely conserved among fungi where it appears to be the principle blue light photoreceptor for the entire kingdom. [4]

Circadian regulation

Simplified Representation of Neurospora Circadian Clock. WC-1 and WC-2 (WCC) act as positive activators of frq transcription. FRQ protein binds to an RNA helicase, FRH, and to CK1 forming a complex. This complex interacts with WCC, promoting phosphorylation of WCC. Phosphorylation stabilizes WCC and promotes its export to the cytoplasm, effectively down-regulating frq transcription. Simplified Representation of Neurospora Circadian Clock.jpg
Simplified Representation of Neurospora Circadian Clock. WC-1 and WC-2 (WCC) act as positive activators of frq transcription. FRQ protein binds to an RNA helicase, FRH, and to CK1 forming a complex. This complex interacts with WCC, promoting phosphorylation of WCC. Phosphorylation stabilizes WCC and promotes its export to the cytoplasm, effectively down-regulating frq transcription.

The White Collar Complex (WCC), the heterodimer of WC-1 and WC-2, acts as a positive element in the circadian clock. WCC serves as an activator of frq gene transcription by binding to two DNA promotor elements in the nucleus: the Clock box (C box) and the Proximal Light-Response Element (PLRE). PLRE is required for maximal light induction, while the C box is required for both maximal light induction and maintaining circadian rhythmicity in constant darkness. [10] [22]

In addition, light-activated WCC is shown to induce the transcription of VIVID, a small flavin-binding blue-light photoreceptor that is required for adaptation to light-induced responses in the transcription of light-induced genes, including wc-1 and frq. [23] [24] [25] VIVID is a negative regulator of light responses, although its mechanism is not yet known. [26]

As part of the transcription-translation negative feedback-loop (TTFL), FRQ protein enters the nucleus and interacts with FRQ-interacting RNA Helicase (FRH) to promote the repression of WCC activity. This FRQ–FRH complex is suggested to recruit protein kinases such as casein kinase (CK I) and CK II to phosphorylate WCC. [27] The phosphorylation of the WCC stabilizes WCC, preventing it from binding and activating frq transcription. Protein phosphatases PP2A and PP4 are known to counterbalance kinase activity and support the reactivation and nuclear entry of WCC. [28]

FRQ has also been shown to interact with WC-2 in vitro , and a partial loss-of-function allele of wc-2 yields Neurospora with a long period length and altered temperature compensation, which is a key characteristic of circadian pacemakers. [10] [29]

Only WC-1 is required for transient light-induction, but both WC-1 and WC-2 are required for the circadian clock to run. [10] [30] Because the core of the clock is based on a rhythmic expression of frq, the acute light-induction pathway provides a direct way to reset the clock. Mammalian clocks can be reset through a similar mechanism, via the light-induction of the mammalian per genes within the SCN. [31]

Several WC-1 mutants are known. The rhy-2 mutation was localized to the polyglutamine region of the WC-1 gene product. The rhy-2 mutant is arrhythmic with regard to conidiation in constant darkness, but rhythmic in a light-dark cycle. Rhy-2 is also only weakly sensitive to light, suggesting that the polyglutamine region may be essential for both clock function and light sensing in Neurospora. [32]

See also

Related Research Articles

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References

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  7. ↑ Fungal Genomics. Elsevier. 2003.
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  13. ↑ Harding RW, Shropshire W (1980). "Photocontrol of Carotenoid Biosynthesis". Annual Review of Plant Physiology. 31 (1): 217–238. doi:10.1146/annurev.pp.31.060180.001245.
  14. ↑ Perkins DD, Radford A, Newmeyer D, Björkman M (Dec 1982). "Chromosomal loci of Neurospora crassa". Microbiological Reviews. 46 (4): 426–570. doi:10.1128/mr.46.4.426-570.1982. PMC   281555 . PMID   6219280.
  15. ↑ Talora C, Franchi L, Linden H, Ballario P, Macino G (Sep 1999). "Role of a white collar-1-white collar-2 complex in blue-light signal transduction". The EMBO Journal. 18 (18): 4961–4968. doi:10.1093/emboj/18.18.4961. PMC   1171567 . PMID   10487748.
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  17. ↑ He Q, Cheng P, Yang Y, Wang L, Gardner KH, Liu Y (Aug 2002). "White collar-1, a DNA binding transcription factor and a light sensor". Science. 297 (5582): 840–3. Bibcode:2002Sci...297..840H. doi: 10.1126/science.1072795 . PMID   12098705. S2CID   45341799.
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  19. ↑ Lewis JA, Escalante-Semerena JC (Aug 2006). "The FAD-dependent tricarballylate dehydrogenase (TcuA) enzyme of Salmonella enterica converts tricarballylate into cis-aconitate". Journal of Bacteriology. 188 (15): 5479–5486. doi:10.1128/JB.00514-06. PMC   1540016 . PMID   16855237.
  20. ↑ Baker CL, Kettenbach AN, Loros JJ, Gerber SA, Dunlap JC (May 2009). "Quantitative proteomics reveals a dynamic interactome and phase-specific phosphorylation in the Neurospora circadian clock". Molecular Cell. 34 (3): 354–63. doi:10.1016/j.molcel.2009.04.023. PMC   2711022 . PMID   19450533.
  21. ↑ Hurley J, Loros JJ, Dunlap JC (2015). "Dissecting the mechanisms of the clock in Neurospora". Circadian Rhythms and Biological Clocks, Part A. Methods in Enzymology. Vol. 551. pp. 29–52. doi:10.1016/bs.mie.2014.10.009. ISBN   9780128012185. PMC   4351707 . PMID   25662450.
  22. ↑ Gooch VD, Johnson AE, Larrondo LF, Loros JJ, Dunlap JC (Feb 2014). "Bright to dim oscillatory response of the Neurospora circadian oscillator". Journal of Biological Rhythms. 29 (1): 49–59. doi:10.1177/0748730413517983. PMC   4083493 . PMID   24492882.
  23. ↑ Schwerdtfeger C, Linden H (Sep 2003). "VIVID is a flavoprotein and serves as a fungal blue light photoreceptor for photoadaptation". The EMBO Journal. 22 (18): 4846–4855. doi:10.1093/emboj/cdg451. PMC   212719 . PMID   12970196.
  24. ↑ Heintzen C, Loros JJ, Dunlap JC (Feb 2001). "The PAS protein VIVID defines a clock-associated feedback loop that represses light input, modulates gating, and regulates clock resetting". Cell. 104 (3): 453–64. doi: 10.1016/s0092-8674(01)00232-x . PMID   11239402.
  25. ↑ Schwerdtfeger C, Linden H (Feb 2001). "Blue light adaptation and desensitization of light signal transduction in Neurospora crassa". Molecular Microbiology. 39 (4): 1080–7. doi: 10.1046/j.1365-2958.2001.02306.x . PMID   11251826.
  26. ↑ Brunner M, Káldi K (Apr 2008). "Interlocked feedback loops of the circadian clock of Neurospora crassa". Molecular Microbiology. 68 (2): 255–262. doi: 10.1111/j.1365-2958.2008.06148.x . PMID   18312266. S2CID   24217663.
  27. ↑ Shi M, Collett M, Loros JJ, Dunlap JC (Feb 2010). "FRQ-interacting RNA helicase mediates negative and positive feedback in the Neurospora circadian clock". Genetics. 184 (2): 351–361. doi:10.1534/genetics.109.111393. PMC   2828717 . PMID   19948888.
  28. ↑ Cha J, Zhou M, Liu Y (2015). "Methods to study molecular mechanisms of the Neurospora circadian clock". Circadian Rhythms and Biological Clocks, Part A. Methods in Enzymology. Vol. 551. pp. 137–151. doi:10.1016/bs.mie.2014.10.002. ISBN   9780128012185. PMC   4617788 . PMID   25662455.
  29. ↑ Wang B, Kettenbach AN, Gerber SA, Loros JJ, Dunlap JC (Sep 2014). "Neurospora WC-1 recruits SWI/SNF to remodel frequency and initiate a circadian cycle". PLOS Genetics. 10 (9): e1004599. doi: 10.1371/journal.pgen.1004599 . PMC   4177678 . PMID   25254987.
  30. ↑ Crosthwaite SK, Loros JJ, Dunlap JC (Jun 1995). "Light-induced resetting of a circadian clock is mediated by a rapid increase in frequency transcript". Cell. 81 (7): 1003–1012. doi: 10.1016/s0092-8674(05)80005-4 . PMID   7600569.
  31. ↑ Shigeyoshi Y, Taguchi K, Yamamoto S, Takekida S, Yan L, Tei H, Moriya T, Shibata S, Loros JJ, Dunlap JC, Okamura H (Dec 1997). "Light-induced resetting of a mammalian circadian clock is associated with rapid induction of the mPer1 transcript". Cell. 91 (7): 1043–1053. doi: 10.1016/s0092-8674(00)80494-8 . PMID   9428526.
  32. ↑ Toyota K, Onai K, Nakashima H (Sep 2002). "A new wc-1 mutant of Neurospora crassa shows unique light sensitivity in the circadian conidiation rhythm". Molecular Genetics and Genomics. 268 (1): 56–61. doi:10.1007/s00438-002-0722-1. PMID   12242499. S2CID   19611947.
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