Target type: molecularfunction
DNA-binding activity that is dependent on binding to a histone. [PMID:11691835]
Histone-dependent DNA binding refers to the interaction between proteins and DNA that is mediated by histones. Histones are basic proteins that package and order the DNA into structural units called nucleosomes. These nucleosomes form the fundamental building blocks of chromatin, the complex of DNA and proteins that constitutes chromosomes.
Histone-dependent DNA binding is crucial for various cellular processes, including:
* **Gene regulation:** Histones can modify DNA accessibility to regulatory proteins such as transcription factors, influencing gene expression.
* **DNA replication:** Histones play a role in unwinding DNA during replication, allowing access for DNA polymerase.
* **DNA repair:** Histones are involved in the recruitment of repair enzymes to damaged DNA, facilitating its repair.
* **Chromatin structure:** Histones influence the compaction and organization of chromatin, ensuring proper chromosome segregation during cell division.
The molecular mechanism of histone-dependent DNA binding involves a combination of protein-DNA and protein-protein interactions:
* **Protein-DNA interactions:** Histones contain specific DNA-binding domains that recognize and interact with specific DNA sequences.
* **Protein-protein interactions:** Histones interact with each other and with other chromatin-associated proteins, forming a complex network that influences DNA accessibility.
The interactions between histones and DNA are dynamic and can be influenced by various factors, including:
* **Post-translational modifications:** Histones can be modified by a variety of chemical modifications, such as acetylation, methylation, and phosphorylation. These modifications can alter the affinity of histones for DNA, influencing DNA accessibility and gene expression.
* **Chromatin remodeling complexes:** These complexes use energy derived from ATP hydrolysis to reposition nucleosomes, changing the accessibility of DNA to regulatory proteins.
* **Transcription factors:** Transcription factors can bind to DNA and recruit histone-modifying enzymes, altering chromatin structure and influencing gene expression.
In summary, histone-dependent DNA binding is a complex and dynamic process that plays a vital role in regulating various cellular processes. It involves a combination of protein-DNA and protein-protein interactions, influenced by post-translational modifications, chromatin remodeling complexes, and transcription factors.'
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| Protein | Definition | Taxonomy |
|---|---|---|
| Microtubule-associated protein tau | A microtubule-associated protein tau that is encoded in the genome of human. [PRO:DAN] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| gentian violet | crystal violet cation : An iminium ion that is malachite green cation in which the hydrogen at the para- psition of the monosubstituted phenyl group is replaced by a dimethylamino group. | iminium ion | antibacterial agent; antifungal agent |
| lansoprazole | Lansoprazole: A 2,2,2-trifluoroethoxypyridyl derivative of timoprazole that is used in the therapy of STOMACH ULCERS and ZOLLINGER-ELLISON SYNDROME. The drug inhibits H(+)-K(+)-EXCHANGING ATPASE which is found in GASTRIC PARIETAL CELLS. Lansoprazole is a racemic mixture of (R)- and (S)-isomers. | benzimidazoles; pyridines; sulfoxide | anti-ulcer drug; EC 3.6.3.10 (H(+)/K(+)-exchanging ATPase) inhibitor |
| 3,7-bis(dimethylamino)phenothiazin-5-ium | 3,7-bis(dimethylamino)phenothiazin-5-ium : An organic cation that is phenothiazin-5-ium substituted by dimethylamino groups at positions 3 and 7. The chloride salt is the histological dye 'methylene blue'. | organic cation | |
| aurin | aurin: structure | diarylmethane | |
| methylene blue | methylene blue : An organic chloride salt having 3,7-bis(dimethylamino)phenothiazin-5-ium as the counterion. A commonly used dye that also exhibits antioxidant, antimalarial, antidepressant and cardioprotective properties. Methylene Blue: A compound consisting of dark green crystals or crystalline powder, having a bronze-like luster. Solutions in water or alcohol have a deep blue color. Methylene blue is used as a bacteriologic stain and as an indicator. It inhibits GUANYLATE CYCLASE, and has been used to treat cyanide poisoning and to lower levels of METHEMOGLOBIN. | organic chloride salt | acid-base indicator; antidepressant; antimalarial; antimicrobial agent; antioxidant; cardioprotective agent; EC 1.4.3.4 (monoamine oxidase) inhibitor; EC 3.1.1.8 (cholinesterase) inhibitor; EC 4.6.1.2 (guanylate cyclase) inhibitor; fluorochrome; histological dye; neuroprotective agent; physical tracer |
| tolonium chloride | tolonium chloride : An organic chloride salt having 3-amino-7-(dimethylamino)-2-methylphenothiazin-5-ium (tolonium) as the counterion. It is a blue nuclear counterstain that can be used to demonstrate Nissl substance and is also useful for staining mast cell granules, both in metachromatic and orthochromatic techniques. Tolonium Chloride: A phenothiazine that has been used as a hemostatic, a biological stain, and a dye for wool and silk. Tolonium chloride has also been used as a diagnostic aid for oral and gastric neoplasms and in the identification of the parathyroid gland in thyroid surgery. | ||
| azure a | azure A : An organic chloride salt having 3-amino-7-(dimethylamino)phenothiazin-5-ium as the counterion. It is used in making azure eosin stains for blood smear staining. Azure A: RN given refers to chloride | ||
| thionine | thionine : An organic chloride salt composed of 3,7-diaminophenothiazin-5-ium and chloride ions in a 1:1 ratio. A strongly metachromatic dye, useful for the staining of acid mucopolysaccharides. It is also a common nuclear stain and can be used for the demonstration of Nissl substance in nerve cells of the CNS. thionine: do not confuse with the thionins which is a class of polypeptides; RN above is for the chloride; | ||
| epigallocatechin gallate | (-)-epigallocatechin 3-gallate : A gallate ester obtained by the formal condensation of gallic acid with the (3R)-hydroxy group of (-)-epigallocatechin. epigallocatechin gallate: a steroid 5alpha-reductase inhibitor and antimutagen in green tea (Camellia sinensis) | flavans; gallate ester; polyphenol | antineoplastic agent; antioxidant; apoptosis inducer; geroprotector; Hsp90 inhibitor; neuroprotective agent; plant metabolite |
| azure b | azure B : An organic chloride salt having 3-(dimethylamino)-7-(methylamino)phenothiazin-5-ium as the counterion. It is used in making azure eosin stains for blood smear staining and is an active metabolite of methylene blue. Azure B: RN given refers to chloride | ||
| epicatechin | (-)-epicatechin : A catechin with (2R,3R)-configuration. | catechin; polyphenol | antioxidant |
| curcumin | curcumin : A beta-diketone that is methane in which two of the hydrogens are substituted by feruloyl groups. A natural dyestuff found in the root of Curcuma longa. Curcumin: A yellow-orange dye obtained from tumeric, the powdered root of CURCUMA longa. It is used in the preparation of curcuma paper and the detection of boron. Curcumin appears to possess a spectrum of pharmacological properties, due primarily to its inhibitory effects on metabolic enzymes. | aromatic ether; beta-diketone; diarylheptanoid; enone; polyphenol | anti-inflammatory agent; antifungal agent; antineoplastic agent; biological pigment; contraceptive drug; dye; EC 1.1.1.205 (IMP dehydrogenase) inhibitor; EC 1.1.1.21 (aldehyde reductase) inhibitor; EC 1.1.1.25 (shikimate dehydrogenase) inhibitor; EC 1.6.5.2 [NAD(P)H dehydrogenase (quinone)] inhibitor; EC 1.8.1.9 (thioredoxin reductase) inhibitor; EC 2.7.10.2 (non-specific protein-tyrosine kinase) inhibitor; EC 3.5.1.98 (histone deacetylase) inhibitor; flavouring agent; food colouring; geroprotector; hepatoprotective agent; immunomodulator; iron chelator; ligand; lipoxygenase inhibitor; metabolite; neuroprotective agent; nutraceutical; radical scavenger |
| gossypetin | gossypetin : A hexahydroxyflavone having the hydroxy groups placed at the 3-, 3'-, 4'-, 5- 7- and 8-positions. gossypetin: inhibits activity of penicillinase enzyme in E coli | 7-hydroxyflavonol; hexahydroxyflavone | plant metabolite |
| myricetin | 7-hydroxyflavonol; hexahydroxyflavone | antineoplastic agent; antioxidant; cyclooxygenase 1 inhibitor; food component; geroprotector; hypoglycemic agent; plant metabolite | |
| su 4312 | SU4312 : A member of the class of oxindoles that is 3-methyleneoxindole in which one of the hydrogens of the methylene group has been replaced by a p-(dimethylamino)phenyl group. SU 4312 is a vascular endothelial growth factor (VEGF) receptor protein tyrosine kinase 1/2 and platelet derived growth factor (PDGF) receptor inhibitor. It also inhibits the neuronal nitric oxide synthase (NOS) and exhibits neuroprotection against NO-mediated neurotoxicity. | ||
| 2-(4'-(methylamino)phenyl)-6-hydroxybenzothiazole | |||
| cnb 001 | |||
| hydrazinocurcumin | hydrazinocurcumin : A pyrazole obtained by cyclocodensation of the two carbonyl groups of curcumin with hydrazine. hydrazinocurcumin: structure in first source | aromatic ether; olefinic compound; polyphenol; pyrazoles | angiogenesis modulating agent; antineoplastic agent; EC 2.3.1.48 (histone acetyltransferase) inhibitor; EC 2.7.11.1 (non-specific serine/threonine protein kinase) inhibitor |