dihydroxyacetone phosphate การใช้

• Aldolase B converts it into glyceraldehyde and dihydroxyacetone phosphate ( DHAP ).
• Hence, this enzyme has one products, dihydroxyacetone phosphate and formaldehyde.
• When dihydroxyacetone phosphate is produced, glyceroneogenesis will branch off from gluconeogenesis.
• The enzyme is used in the first step in turning glycerol into dihydroxyacetone phosphate ( DHAP ).
• GPD1 consists of two subunits, and reacts with dihydroxyacetone phosphate and NAD + though the following interaction:
• Oxidation of cytoplasmic NADH by the cytosolic form of the enzyme creates glycerol-3-phosphate from dihydroxyacetone phosphate.
• During glycolysis, fructose-1, 6-diphosphate is broken down into glyceraldehyde-3-phosphate and dihydroxyacetone phosphate.
• Instead of producing fructose 1, 6-bisphosphate as gluconeogenesis does, glyceroneogenesis converts dihydroxyacetone phosphate to glycerol 3-phosphate.
• In the liver the glycerol can be converted into glucose via dihydroxyacetone phosphate and glyceraldehyde-3-phosphate by way of gluconeogenesis.
• Methylglyoxal is formed spontaneously from dihydroxyacetone phosphate, enzymatically by triosephosphate isomerase and methylglyoxal synthase, as also in the catabolism of threonine.
• For example, the intermediate dihydroxyacetone phosphate ( DHAP ) is a source of the glycerol that combines with fatty acids to form fat.
• Through the reduction of dihydroxyacetone phosphate into glycerol 3-phosphate, GPDH allows the prompt dephosphorylation of glycerol 3-phosphate into glycerol.
• The protein encoded by this gene is a glycolytic enzyme that catalyzes the reversible conversion of fructose-1, 6-bisphosphate to dihydroxyacetone phosphate.
• The aldol cleavage of fructose 1, 6-bisphosphate by aldolase b demonstrates the different reaction products, dihydroxyacetone phosphate and glyceraldehyde 3-phosphate.
• Abbreviations : DHAP-dihydroxyacetone phosphate; Fru1, 6bP-Fructose-1, 6-bisphosphate; GAD-glyceraldehyde 3-phosphate ".
• With expense of NADH, dihydroxyacetone phosphate will convert to glycerol 3-phosphate ( Figure 4 ), which is the final product of glyceroneogenesis.
• Cytosolic Glycerol-3-phosphate dehydrogenase ( GPD1 ), is an NAD +-dependent enzyme that reduces dihydroxyacetone phosphate to glycerol-3-phosphate.
• When pyruvate of lactate is used as the precursor for glycerol 3-phosphate, glyceroneogenesis follows exactly the same pathway as gluconeogenesis until it generates dihydroxyacetone phosphate.
• So before glycerol can enter the pathway of glycolysis it must be converted into an intermediate molecule, which in this case is dihydroxyacetone phosphate ( DHAP ).
• Glycerol 3-phosphate is then oxidized to dihydroxyacetone phosphate, which is, in turn, converted into glyceraldehyde 3-phosphate by the enzyme triose phosphate isomerase.