3-Methylhistidine
3-Methylhistidine
3-Methylhistidine is a non-proteinogenic amino acid that is derived from the methylation of the amino acid histidine. It is primarily found in actin and myosin, which are proteins in muscle tissue.
Biochemistry[edit]
3-Methylhistidine is formed by the post-translational modification of histidine residues in muscle proteins. This modification is catalyzed by specific methyltransferase enzymes. Once incorporated into proteins, 3-methylhistidine is not reused in protein synthesis and is excreted in the urine.
Physiological Role[edit]
3-Methylhistidine is used as a biomarker for muscle protein breakdown. Since it is released during the degradation of actin and myosin, its presence in urine can be an indicator of muscle catabolism. This makes it useful in clinical settings to assess muscle wasting conditions.
Clinical Significance[edit]
The measurement of urinary 3-methylhistidine can be used to evaluate muscle protein turnover in various conditions such as cachexia, sarcopenia, and muscular dystrophy. It is also used in nutritional studies to assess the effects of dietary protein intake on muscle metabolism.
Metabolism[edit]
After being released from muscle proteins, 3-methylhistidine is not further metabolized in the body. It is filtered by the kidneys and excreted in the urine. This makes it a reliable marker for assessing muscle protein breakdown.
Related Compounds[edit]
Related Pages[edit]
3-Methylhistidine[edit]
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Structure of 3-Methylhistidine
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