Biology:Aminoshikimate pathway
The Aminoshikimate pathway is a biochemical pathway present in some plants, which has been studied by biologists, biochemists and especially those interested in manufacture of novel antibiotic drugs. The pathway is a novel variation of the shikimate pathway. The aminoshikimate pathway was first discovered and studied in the rifamycin B producer Amycolatopsis mediterranei. Its end product, 3-amino-5-hydroxybenzoate, serves as an initiator for polyketide synthases in the biosynthesis of ansamycins.[1]
Overview
Floss and coworkers identified the gene cluster associated with the aminoshikimate pathway in Amycolatopsis mediterranei.[2] The enzyme-catalyzed condensation of 1-deoxy-1-imino-D-erythrose 4-phosphate with phosphoenolpyruvate to form 4-amino-3,4-dideoxy-d-arabino-heptulosonic acid 7-phosphate has been proposed to be the first committed step in the aminoshikimate pathway. Guo and Frost demonstrated that the unusual metabolite, 1-deoxy-1-imino-D-erythrose 4-phosphate, is derived from 3-amino-3-deoxy-D-fructose 6-phosphate.[3] In addition, kanosamine biosynthesis has been directly implicated by Guo and Frost as the source of the aminoshikimate pathway's nitrogen atom.[4]
Uses
Aminoshikimate pathway has been assembled in E. coli to synthesize aminoshikimic acid, which is a promising starting material for the synthesis of antiinfluenza agent oseltamivir (brand name Tamiflu).[5][6]
References
- ↑ Floss, H. G. (1997). "Natural products derived from unusual variants of the shikimate pathway.". Nat Prod Rep 14 (5): 433–452. doi:10.1039/np9971400433. PMID 9364776. http://www.rsc.org/publishing/journals/NP/article.asp?doi=NP9971400433.
- ↑ August, P. R.; tang, L.; Yoon, Y. J.; Ning, S.; Muller, R.; Yu, T. -W.; Taylor, M.; Hoffmann, D. et al. (1998). "Biosynthesis of the ansamycin antibiotic rifamycin: deductions from the molecular analysis of the rif biosynthetic gene cluster of Amycolatopsis mediterranei S699". Chem. Biol. 5 (2): 69–79. doi:10.1016/S1074-5521(98)90141-7. PMID 9512878.
- ↑ Guo, Jiantao; Frost, John (2002). "Biosynthesis of 1-Deoxy-1-imino-d-erythrose 4-Phosphate: A Defining Metabolite in the Aminoshikimate Pathway". J. Am. Chem. Soc. 124 (4): 528–529. doi:10.1021/ja016963v. PMID 11804477.
- ↑ Guo, Jiantao; Frost, John (2002). "Kanosamine Biosynthesis: A Likely Source of the Aminoshikimate Pathway's Nitrogen Atom". J. Am. Chem. Soc. 124 (36): 10642–10643. doi:10.1021/ja026628m. PMID 12207504.
- ↑ Guo, Jiantao; Frost, John (2004). "Synthesis of Aminoshikimic Acid". Org. Lett. 6 (10): 1585–1588. doi:10.1021/ol049666e. PMID 15128242.
- ↑ Frost, J.; Guo, J. (2007). Synthesis of oseltamivir carboxylates, US patent 2007/0190621 A1. http://www.google.com/patents?id=ZCeBAAAAEBAJ&dq=%22Synthesis+of+oseltamivir+carboxylates%22.
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