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Glycogen phosphorylase isoenzyme BB (abbreviation: GPBB) is an isoenzyme of glycogen phosphorylase. This isoform of the enzyme exists in cardiac (heart) and brain tissue. The enzyme is one of the "new cardiac markers" which are discussed to improve early diagnosis in acute coronary syndrome.
Glycogen phosphorylase isoenzyme BB: 0.854 and 0.767 [12] 7 hours Glycogen phosphorylase isoenzyme BB (abbreviation: GPBB) is one of the three isoforms of glycogen phosphorylase. This isoform of the enzyme exists in cardiac (heart) and brain tissue. Because of the blood–brain barrier, GP-BB can be seen as being specific to heart muscle.
The PYGB gene encodes one of three major glycogen phosphorylase isoforms, which are distinguished by their different structures and subcellular localizations: brain (PYGB), muscle (PYGM), and liver . [ 2 ] [ 3 ] GPBB is the longest of the three isozymes , with a length of 862 residues , due to the extended 3' - UTR at the enzyme's C-terminal .
An isoenzyme of glycogen phosphorylase exists in the liver sensitive to glucose concentration, as the liver acts as a glucose exporter. In essence, liver phosphorylase is responsive to glucose, which causes a very responsive transition from the R to T form, inactivating it; furthermore, liver phosphorylase is insensitive to AMP.
New markers such as glycogen phosphorylase isoenzyme BB are under investigation. [16] Note that only the cardiac troponins are used clinically for myocardial infarction as creatine kinase adds little value in diagnosing MI while adding to system cost. [17] [18] [19]
Becaplermin, sold under the brand name Regranex, is a cicatrizant, available as a topical gel. Regranex is a human platelet-derived growth factor indicated along with good wound care for the treatment of lower extremity diabetic neuropathic ulcers. [1] It is also known as "platelet-derived growth factor BB". [1]
Myophosphorylase or glycogen phosphorylase, muscle associated (PYGM) is the muscle isoform of the enzyme glycogen phosphorylase and is encoded by the PYGM gene. This enzyme helps break down glycogen (a form of stored carbohydrate ) into glucose-1-phosphate (not glucose ), so it can be used within the muscle cell .
3.) Isoenzymes of alkaline phosphatase: [7] Six isoenzymes have been identified. The enzyme is a monomer, the isoenzymes are due to the differences in the carbohydrate content (sialic acid residues). The most important ALP isoenzymes are α 1-ALP, α 2-heat labile ALP, α 2-heat stable ALP, pre-β ALP and γ-ALP.