期刊
CRITICAL REVIEWS IN MICROBIOLOGY
卷 39, 期 4, 页码 395-415出版社
TAYLOR & FRANCIS LTD
DOI: 10.3109/1040841X.2012.716819
关键词
Indolepyruvic acid pathway; indoleacetamide pathway; indoleacetonitrile pathway; phylogenetics of IAA genes; IAA gene regulation
类别
资金
- Natural Sciences and Engineering Research Council of Canada
The capacity to produce the phytohormone indole-3-acetic acid (IAA) is widespread among bacteria that inhabit diverse environments such as soils, fresh and marine waters, and plant and animal hosts. Three major pathways for bacterial IAA synthesis have been characterized that remove the amino and carboxyl groups from the alpha-carbon of tryptophan via the intermediates indolepyruvate, indoleacetamide, or indoleacetonitrile; the oxidized end product IAA is typically secreted. The enzymes in these pathways often catabolize a broad range of substrates including aromatic amino acids and in some cases the branched chain amino acids. Moreover, expression of some of the genes encoding key IAA biosynthetic enzymes is induced by all three aromatic amino acids. The broad distribution and substrate specificity of the enzymes suggests a role for these pathways beyond plant-microbe interactions in which bacterial IAA has been best studied.
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