Relationship between tryptophan and auxin

Tryptophan is an important precursor substance for auxin biosynthesis in plants, and its structure is similar to that of IAA, which is ubiquitous in higher plants. There are two ways to synthesize auxin through tryptophan: (1) tryptophan is first oxidized and deamidated to form indole acetone, and then decarboxylated to form indoleacetaldehyde; (2) Tryptophan is first decarboxylated to form tryptophan, and then oxidized and deamidated by tryptophan to form indoleacetic acid.

Indoleacetaldehyde is finally oxidized to indoleacetic acid under the catalysis of the corresponding enzyme. It can be seen that indoleacetaldehyde is a common intermediate product of both pathways (Figure 6-5). As for which pathway auxin biosynthesis takes depends on the type and organ of different plants, most researchers believe that the first pathway is the main pathway of auxin biosynthesis in higher plants.

In addition, there is more indoleacetonitrile in cruciferous plants, which can also be converted into indoleacetic acid under the action of enzymes. The existence of these auxin synthesis pathways can ensure that different plant types and plants maintain normal levels of auxin in different growth periods and different environments.

For more information, see the documentation.

**Beautiful, easy to understand, I hope it can be helpful to you.

Summary. auxin, then it's not protein, it's indoleacetic acid, which is a plant hormone. But there is another animal hormone called growth hormone, which is secreted by the pituitary gland, which is protein.

Is auxin a protein? Isn't it converted from tryptophan high school biology?

auxin, then it's not protein, it's indoleacetic acid, which is a plant hormone. But there is another animal hormone called growth hormone, which is secreted by the pituitary gland, which is protein.

Here's my advice, I hope it helps! If you're satisfied, you can. I hope to get 5 stars like it......Thank you!!

I wish you a happy life!!

Growth hormone is a peptide or protein hormone. The composition of growth hormone consists of 191 amino acid residues. There is no clear boundary between peptides and proteins, and there is a literature that refers to peptides containing more than 50 amino acid residues as proteins, according to which growth hormone meets the criteria for proteins.

In addition, growth hormone contains four cysteines that form two disulfide bonds, which also conforms to the structural characteristics of proteins.

Plant tryptophan metabolism pathways include two pathways: aromatic amino acid pathway and non-aromatic amino acid pathway. Among them, the aromatic amino acid pathway is the pathway for the synthesis of plant pigments, while the non-aromatic amino acid pathway is the pathway for the synthesis of plant growth hormone.

Plant tryptophan is an important amino acid capable of synthesizing plant pigments through the aromatic amino acid pathway. Plant pigments are important biological pigments in plants, which play an important role in photosynthesis and photoperiod control. In the aromatic amino acid pathway, phenylalanine and tyrosine are the precursors for the synthesis of plant pigments, which are catalyzed by phenylalanine hydroxylase and tyrosine hydroxylase to form tyrosine and 3,4-dihydroxyphenylacetone, and then through a series of reactions, finally plant pigments are formed.

On the other hand, plant tryptophan is also able to synthesize plant growth hormone through non-aromatic amino acid pathways. Plant growth hormone is a hormone that regulates plant growth and development, and plays an important role in plant morphology, physiology, and ecology. In the non-aromatic amino acid pathway, tryptophan is converted to indole-3-acetic acid, which then undergoes a series of reactions to finally form plant growth hormone.

In the actual application of this stool, in order to regulate plant growth and development, the content of plant growth hormone and plant pigment can be adjusted by changing the plant tryptophan metabolism pathway. For example, by expressing the tyrosine hydroxylase gene in plants, it can increase the content of tyrosine and plant pigments in plants; By expressing tryptophan oxidase gene in plants, it can inhibit the synthesis of plant tryptophan, thereby reducing the content of plant growth hormone.

In conclusion, the plant tryptophan metabolism pathway is an important metabolic pathway in plants and plays an important role in plant growth and development. In practical application, plant growth and development can be regulated by regulating the plant tryptophan metabolism pathway.