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L-tryptophan—pyruvate aminotransferase (EC 2.6.1.99, TAA1 (gene), vt2 (gene)) is an enzyme with systematic name L-tryptophan:pyruvate aminotransferase. This enzyme catalyses the following chemical reaction

L-tryptophan + pyruvate ${\displaystyle \rightleftharpoons }$ indole-3-pyruvate + L-alanine

This plant enzyme, along with EC 1.14.13.168, indole-3-pyruvate monooxygenase, is responsible for the biosynthesis of the plant hormone indole-3-acetate from L-tryptophan.

References

1. Tao Y, Ferrer JL, Ljung K, Pojer F, Hong F, Long JA, Li L, Moreno JE, Bowman ME, Ivans LJ, Cheng Y, Lim J, Zhao Y, Ballaré CL, Sandberg G, Noel JP, Chory J (April 2008). "Rapid synthesis of auxin via a new tryptophan-dependent pathway is required for shade avoidance in plants". Cell. 133 (1): 164–76. doi:10.1016/j.cell.2008.01.049. PMC 2442466. PMID 18394996.
2. Mashiguchi, K.; Tanaka, K.; Sakai, T.; Sugawara, S.; Kawaide, H.; Natsume, M.; Hanada, A.; Yaeno, T.; Shirasu, K.; Yao, H.; McSteen, P.; Zhao, Y.; Hayashi, K.-i.; Kamiya, Y.; Kasahara, H. (8 November 2011). "The main auxin biosynthesis pathway in Arabidopsis". Proceedings of the National Academy of Sciences. 108 (45): 18512–18517. Bibcode:2011PNAS..10818512M. doi:10.1073/pnas.1108434108. PMC 3215075. PMID 22025724.
3. Phillips KA, Skirpan AL, Liu X, Christensen A, Slewinski TL, Hudson C, Barazesh S, Cohen JD, Malcomber S, McSteen P (February 2011). "vanishing tassel2 encodes a grass-specific tryptophan aminotransferase required for vegetative and reproductive development in maize". The Plant Cell. 23 (2): 550–66. doi:10.1105/tpc.110.075267. PMC 3077783. PMID 21335375.
4. Zhao Y (March 2012). "Auxin biosynthesis: a simple two-step pathway converts tryptophan to indole-3-acetic acid in plants". Molecular Plant. 5 (2): 334–8. doi:10.1093/mp/ssr104. PMC 3309920. PMID 22155950.

External links

• L-tryptophan---pyruvate+aminotransferase at the U.S. National Library of Medicine Medical Subject Headings (MeSH)

• Biology

(Silicon ski)

• EC 2.6.1