Homogentisic acid
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Homogentisic acid is an organic compound that plays a crucial role in the metabolism of the amino acids tyrosine and phenylalanine. It is a key intermediate in the catabolic pathway of these amino acids.
Biochemistry[edit]
Homogentisic acid is formed during the breakdown of tyrosine and phenylalanine through the action of the enzyme homogentisate 1,2-dioxygenase. This enzyme catalyzes the conversion of homogentisic acid to maleylacetoacetic acid, which is further processed in the metabolic pathway.
Medical significance[edit]
The accumulation of homogentisic acid in the body is associated with a rare genetic disorder known as alkaptonuria. This condition is caused by a deficiency in the enzyme homogentisate 1,2-dioxygenase, leading to the buildup of homogentisic acid in tissues and its excretion in urine. Over time, this can result in ochronosis, a condition characterized by the darkening of connective tissues, and can lead to arthritis and other complications.
Chemical properties[edit]
Homogentisic acid is a dihydroxyphenylacetic acid with the chemical formula C_8H_8O_4. It is a crystalline solid that is soluble in water. The compound has two hydroxyl groups attached to a benzene ring, which makes it a dihydroxy derivative of phenylacetic acid.
Related compounds[edit]
Homogentisic acid is structurally related to other phenolic acids, such as gallic acid and protocatechuic acid. It is also related to phenylacetic acid and its derivatives.
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