Part:BBa_K515100

IAA biosynthetic genes under control of the Pveg2 promoter

Sequence and Features

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  COMPATIBLE WITH RFC[12]
• 21
  INCOMPATIBLE WITH RFC[21]

  Illegal BglII site found at 547
  Illegal BamHI site found at 1492
  
• 23
  COMPATIBLE WITH RFC[23]
• 25
  INCOMPATIBLE WITH RFC[25]

  Illegal NgoMIV site found at 254
  Illegal NgoMIV site found at 2835
  
• 1000
  COMPATIBLE WITH RFC[1000]

Background

The IAM pathway is a two step pathway which generates indole-3-acetic acid (IAA), also known as auxin, from the precursor tryptophan. IAA tryptophan monooxygenase (IaaM) BBa_K515000, catalyzes the oxidative carboxylation of L-tryptophan to indole-3-acetamide which is hydrolyzed to indole-3-acetic acid and ammonia by indoleacetamide hydrolase (IaaH) BBa_K515001 . There are several different pathways that produce indole-3-acetic acid.[1]

Figure 1: Different pathways can be used to produce IAA. This construct follows the IAM pathway which involves genes IaaM and IaaH to convert tryptophan to IAA via the IAM intermediate.

IaaM and IaaH originate from P.savastanoi and have been expressed in E. coli previously, and shown to secrete auxin into cell supernatant.[2]

Experimental Data

Figure 1: Standard curve of Salkowski assay made with synthetic IAA in LB

Figure 2: Cuvettes used to measure OD for the standard curve. As IAA concentration increases, the solution progresses towards red.

References

[1]Spaepen S. et al., 2007. Indole-3-acetic acid in microbial and microorganism-plant signaling. Federation of European Microbiological Societies Microbiology Reviews , 31, pp.425–448.

[2]Palm, CJ et al., 1989. Cotranscription of genes encoding indoleacetic acid production in Pseudomonas syringae subsp. savastanoi. Journal of Bacteriology, 171(2), pp.1002-1009.