Chemistry:3-Amino-1,2,4-triazole
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| Names | |
|---|---|
| IUPAC name
1H-1,2,4-Triazol-3-amine
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| Other names
1,2,4-Triazol-3-amine
aminotriazole Amitrol Amitrole 3-Aminotriazole 2-Amino-1,3,4-triazole | |
| Identifiers | |
3D model (JSmol)
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| Abbreviations | 3-AT |
| 107687 | |
| ChEBI | |
| ChEMBL | |
| ChemSpider | |
| EC Number |
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| 200706 | |
| KEGG | |
| MeSH | Amitrole |
PubChem CID
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| RTECS number |
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| UNII | |
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| Properties | |
| C2H4N4 | |
| Molar mass | 84.08 |
| Appearance | colorless/white crystals or powder[2] |
| Odor | odorless |
| Density | 1.138 g/mol |
| Melting point | 157 to 159 °C (315 to 318 °F; 430 to 432 K) |
| Boiling point | 347 |
| 28 g/100 mL | |
| Solubility | soluble in acetonirile, chloroform, ethanol, methanol, methylene chloride negligible in ethyl acetate |
| Vapor pressure | 3.13x10−9 mmHg |
| Hazards | |
| Main hazards | potential occupational carcinogen |
| GHS pictograms |  
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| GHS Signal word | Warning |
| H361, H373, H411 | |
| P201, P202, P260, P273, P281, P308+313, P314, P391, P405, P501 | |
| NFPA 704 (fire diamond) | |
| Flash point | Non-flammable |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose)
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1,100 to 2,500 mg/kg |
| NIOSH (US health exposure limits): | |
PEL (Permissible)
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none[2] |
REL (Recommended)
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Ca TWA 0.2 mg/m3[2] |
IDLH (Immediate danger)
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Ca/N.D.[2] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
 verify (what is   ?)
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| Infobox references | |
3-Amino-1,2,4-triazole (3-AT) is a heterocyclic organic compound that consists of a 1,2,4-triazole substituted with an amino group.
3-AT is a competitive inhibitor of the product of the HIS3 gene, imidazoleglycerol-phosphate dehydratase.[3][4] Imidazoleglycerol-phosphate dehydratase is an enzyme catalyzing the sixth step of histidine production.[5]
3-AT is also a nonselective systemic triazole herbicide used on nonfood croplands to control annual grasses and broadleaf and aquatic weeds. It is not used on food crops because of its carcinogenic properties. As an herbicide, it is known as aminotriazole, amitrole or amitrol.
Amitrol was included in a biocide ban proposed by the Swedish Chemicals Agency[6] and approved by the European Parliament on January 13, 2009.[7]
Applications in microbiology
By applying 3-AT to a yeast cell culture which is dependent upon a plasmid containing HIS3 to produce histidine (i.e. its own HIS3 analogue is not present or nonfunctional), an increased level of HIS3 expression is required in order for the yeast cell to survive. This has proved useful in various two-hybrid system, where a high-affinity binding between two proteins (i.e., higher expression of the HIS3 gene) will allow the yeast cell to survive in media containing higher concentrations of 3-AT. This selection process is performed using selective media, containing no histidine.
1959 cranberry contamination
On November 9, 1959, the secretary of the United States Department of Health, Education, and Welfare Arthur S. Flemming announced that some of the 1959 crop was tainted with traces of the herbicide aminotriazole.[8] The market for cranberries collapsed and growers lost millions of dollars.[9] However, Ocean Spray recovered by expanding the market for cranberry juice, which, although widely available for sale, was before then not popular. This ensured cranberry growers would not have to rely mostly on Thanksgiving and Christmas for sales, which was the case until the notorious 1959 incident.
References
- ↑ EXTOXNET – Herbicide fact sheet for amitrole
- ↑ 2.0 2.1 2.2 2.3 NIOSH Pocket Guide to Chemical Hazards. "#0027". National Institute for Occupational Safety and Health (NIOSH). https://www.cdc.gov/niosh/npg/npgd0027.html.
- ↑ "Mechanisms of increasing expression of a yeast gene in Escherichia coli". J. Mol. Biol. 136 (3): 333–8. 1980. doi:10.1016/0022-2836(80)90377-0. PMID 6990004.
- ↑ "A bacterial two-hybrid selection system for studying protein-DNA and protein-protein interactions". Proc. Natl. Acad. Sci. U.S.A. 97 (13): 7382–7. 2000. doi:10.1073/pnas.110149297. PMID 10852947. Bibcode: 2000PNAS...97.7382J.
- ↑ "Yeastgenome.org". http://db.yeastgenome.org/cgi-bin/locus.pl?locus=his3.
- ↑ "Interpretation of criteria for approval of active substances in the proposed EU plant protection regulation". Swedish Chemicals Agency (KemI). 2008-09-23. http://www.kemi.se/templates/News____5415.aspx.
- ↑ "MEPs approve pesticides legislation". 2009-01-13. http://www.europarl.europa.eu/news/expert/infopress_page/066-45937-012-01-03-911-20090112IPR45936-12-01-2009-2009-false/default_en.htm.
- ↑ "Safe Cranberries to Go on Sale". Dubuque Telegraph-Herald. 19 November 1959. https://news.google.com/newspapers?id=8YRFAAAAIBAJ&sjid=ybwMAAAAIBAJ&dq=cranberry%20aminotriazole&pg=6720%2C2153163.
- ↑ New York Times website - Opinion section
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