What is the principle of GGT?
What is the principle of GGT?
PRINCIPLE: Enzymatic colorimetric assay. γ-glutamyltransferase (GGT) transfers the γ-glutamyl group of L-γ-glutamyl -3-carboxy-4-nitroanilide to glycylglycine. The amount of 5-amino-2-nitrobenzoate liberated is proportional to the GGT activity in the sample.
What is a GGT test?
A gamma-glutamyl transferase (GGT) test measures the amount of GGT in the blood. GGT is an enzyme found throughout the body, but it is mostly found in the liver. When the liver is damaged, GGT may leak into the bloodstream. High levels of GGT in the blood may be a sign of liver disease or damage to the bile ducts.
What substrate is used for the analysis of GGT?
The standard assay for GGT1 activity uses gamma-glutamyl p-nitroanalide (GpNA), a non-physiologic compound as a substrate, includes high concentrations of the acceptor glycylglycine (glygly), and is conducted at pH 8.0 or higher [16; 27; 29; 30; 31].
What enzyme is considered the most sensitive indicator of hepatobiliary disease?
Liver enzymes, such as aspartate aminotransferase (AST) and alanine aminotransferase (ALT), are the most sensitive indicators of hepatocyte injury. Both AST and ALT are normally present in low concentrations.
What causes low GGT?
Low levels of GGT are observed in certain genetic diseases where the flow of bile from liver is interrupted or suppressed. Drugs that may cause an elevated GGT level include phenytoin, carbamazepine, and barbiturates such as phenobarbital.
Is low GGT bad?
A GGT low level in the blood is not usually a matter for concern. It can be a sign of an unbalanced diet with vitamin or mineral deficit. Mild GGT decrease (0 – 8 U/L): The GGT level in the blood is low.
What class of enzymes is GGT?
γ-Glutamyltranspeptidase (GGT) is a heterodimic enzyme that is generated from the precursor protein through posttranslational processing and catalyzes the hydrolysis of γ-glutamyl bonds in γ-glutamyl compounds such as glutathione and/or the transfer of the γ-glutamyl group to other amino acids and peptides.
What type of enzyme is Y Glutamyltransferase?
2.2) is a transferase (a type of enzyme) that catalyzes the transfer of gamma-glutamyl functional groups from molecules such as glutathione to an acceptor that may be an amino acid, a peptide or water (forming glutamate).
What happens if GGT is low?
The GGT level in the blood is low. It is not associated with any medical condition or disease. It may be a consequence of an unbalanced diet with deficiency of magnesium or vitamin B6. GGT low level can be also present in case of hypothyroidism.