Biology:EGR1

From HandWiki
Short description: Protein-coding gene in the species Homo sapiens


A representation of the 3D structure of the protein myoglobin showing turquoise α-helices.
Generic protein structure example

EGR-1 (Early growth response protein 1) also known as ZNF268 (zinc finger protein 268) or NGFI-A (nerve growth factor-induced protein A) is a protein that in humans is encoded by the EGR1 gene.

EGR-1 is a mammalian transcription factor. It was also named Krox-24, TIS8, and ZENK. It was originally discovered in mice.

Function

The protein encoded by this gene belongs to the EGR family of Cys2His2-type zinc finger proteins. It is a nuclear protein and functions as a transcriptional regulator. The products of target genes it activates are required for differentiation and mitogenesis. Studies suggest this is a tumor suppressor gene.[1]

It has a distinct pattern of expression in the brain, and its induction has been shown to be associated with neuronal activity. Several studies suggest it has a role in neuronal plasticity.[2]

EGR-1 is an important transcription factor in memory formation. It has an essential role in brain neuron epigenetic reprogramming. EGR-1 recruits the TET1 protein that initiates a pathway of DNA demethylation.[3] Removing DNA methylation marks allows the activation of downstream genes. EGR-1, together with TET1, is employed in programming the distribution of methylation sites on brain DNA during brain development, in learning and in long-term neuronal plasticity. EGR-1 has also been found to regulate the expression of VAMP2 (a protein important for synaptic exocytosis).[4]

Beside its function in the nervous system, there is significant evidence that EGR-1 along with its paralog EGR-2 is induced in fibrotic diseases has key functions in fibrinogenesis and is necessary for experimentally induced fibrosis in mice.[5]

It may also be involved in ovarian function [6]

Structure

The DNA-binding domain of EGR-1 consists of three zinc finger domains of the Cys2His2 type. The amino acid structure of the EGR-1 zinc finger domain is given in this table, using the single letter amino acid code. The fingers 1 to 3 are indicated by f1 - f3. The numbers are in reference to the residues (amino acids) of alpha helix (there is no zero). The residues marked 'x' are not part of the zinc fingers, but rather serve to connect them all together.

-1 1 2 3 4 5 6 7 8 9 x x x x x
f1 M A E E R P Y A C P V E S C D R R F S R S D E L T R H I R I H T G Q K P
f2 F Q C R I - - C M R N F S R S D H L T T H I R T H T G E K P
f3 F A C D I - - C G R K F A R S D E R K R H T K I H L R Q K D

Amino acid key: Alanine (Ala, A), Arginine (Arg, R), Asparagine (Asn, N), Aspartic acid (Asp, D), Cysteine (Cys, C), Glutamic acid (Glu, E), Glutamine (Gln, Q), Glycine (Gly, G), Histidine (His, H), Isoleucine (Ile, I), Leucine (Leu, L), Lysine (Lys, K), Methionine (Met, M), Phenylalanine (Phe, F), Proline (Pro, P), Serine (Ser, S), Threonine (Thr, T), Tryptophan (Trp, W), Tyrosine (Tyr, Y), Valine (Val, V)

The crystal structure of DNA bound by the zinc finger domain of EGR-1 was solved in 1991, which greatly aided early research in zinc finger DNA-binding domains.[7]

The human EGR-1 protein contains (in its unprocessed form) 543 amino acids with a molecular weight of 57.5 kDa, and the gene is located on the chromosome 5.

DNA binding specificity

EGR-1 binds the DNA sequence 5'-GCG TGG GCG-3' (and similar ones like 5'-GCG GGG GCG-3').[8][9] The f1 position 6 binds the 5' G (the first base count from the left); the f1 position 3 to the second base (C); f1 position -1 binds to the third position (G); f2 position 6 to the fourth base (T); and so on.

Interactions

EGR-1 has been shown to interact with:

See also

References

  1. ↑ "Entrez Gene: EGR1 early growth response 1". https://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=1958. 
  2. ↑ "A gene for neuronal plasticity in the mammalian brain: Zif268/Egr-1/NGFI-A/Krox-24/TIS8/ZENK?". Progress in Neurobiology 74 (4): 183–211. November 2004. doi:10.1016/j.pneurobio.2004.05.007. PMID 15556287. 
  3. ↑ Sun Z, Xu X, He J, Murray A, Sun MA, Wei X, Wang X, McCoig E, Xie E, Jiang X, Li L, Zhu J, Chen J, Morozov A, Pickrell AM, Theus MH, Xie H. EGR1 recruits TET1 to shape the brain methylome during development and upon neuronal activity. Nat Commun. 2019 Aug 29;10(1):3892. doi: 10.1038/s41467-019-11905-3. PMID 31467272
  4. ↑ "Role of zinc-finger proteins Sp1 and zif268/egr-1 in transcriptional regulation of the human synaptobrevin II gene". European Journal of Biochemistry 239 (3): 827–34. August 1996. doi:10.1111/j.1432-1033.1996.0827u.x. PMID 8774732. 
  5. ↑ "Early growth response transcription factors: key mediators of fibrosis and novel targets for anti-fibrotic therapy". Matrix Biology 30 (4): 235–42. May 2011. doi:10.1016/j.matbio.2011.03.005. PMID 21511034. 
  6. ↑ "Regulation and action of early growth response 1 in bovine granulosa cells". Reproduction 154 (4): 547–557. October 2017. doi:10.1530/REP-17-0243. PMID 28733346. 
  7. ↑ "Zinc finger-DNA recognition: crystal structure of a Zif268-DNA complex at 2.1 A". Science 252 (5007): 809–17. May 1991. doi:10.1126/science.2028256. PMID 2028256. 
  8. ↑ "DNA binding site of the growth factor-inducible protein Zif268". Proceedings of the National Academy of Sciences of the United States of America 86 (22): 8737–41. November 1989. doi:10.1073/pnas.86.22.8737. PMID 2510170. Bibcode: 1989PNAS...86.8737C. 
  9. ↑ "DNA-binding specificity of NGFI-A and related zinc finger transcription factors". Molecular and Cellular Biology 15 (4): 2275–87. April 1995. doi:10.1128/mcb.15.4.2275. PMID 7891721. 
  10. ↑ "Specific interaction of Egr1 and c/EBPbeta leads to the transcriptional activation of the human low density lipoprotein receptor gene". The Journal of Biological Chemistry 278 (45): 44246–54. November 2003. doi:10.1074/jbc.M305564200. PMID 12947119. 
  11. ↑ 11.0 11.1 "cAMP-response-element-binding-protein-binding protein (CBP) and p300 are transcriptional co-activators of early growth response factor-1 (Egr-1)". The Biochemical Journal 336 ( Pt 1) (1): 183–9. November 1998. doi:10.1042/bj3360183. PMID 9806899. 
  12. ↑ "Identification of NAB1, a repressor of NGFI-A- and Krox20-mediated transcription". Proceedings of the National Academy of Sciences of the United States of America 92 (15): 6873–7. July 1995. doi:10.1073/pnas.92.15.6873. PMID 7624335. Bibcode: 1995PNAS...92.6873R. 
  13. ↑ "Physical interaction between p53 and primary response gene Egr-1". International Journal of Oncology 18 (4): 863–70. April 2001. doi:10.3892/ijo.18.4.863. PMID 11251186. 
  14. ↑ "Regulation of Egr-1 by association with the proteasome component C8". Biochimica et Biophysica Acta (BBA) - Molecular Cell Research 1592 (2): 163–7. October 2002. doi:10.1016/s0167-4889(02)00310-5. PMID 12379479. 

Further reading

External links



Retrieved from "https://handwiki.org/wiki/index.php?title=Biology:EGR1&oldid=2871140"