Exclusive localization in peroxisomes of dihydroxyacetone phosphate acyltransferase and alkyl-dihydroxyacetone phosphate synthase in rat liver.

Exclusive localization in peroxisomes of dihydroxyacetone phosphate acyltransferase and alkyl-dihydroxyacetone phosphate synthase in rat liver.

Dihydroxyacetone phosphate acyl transferase (DHAP-AT), alkyl dihydroxyacetone phosphate synthase (alkyl-DHAP-synthase), and glycerol-3-phosphate acyltransferase (GPAT) activities were investigated under optimal assay conditions using highly purified organelle preparations. The data presented clearly indicate that GPAT activity was mainly localized in mitochondria and microsomes, whereas DHAP-AT...

Subcellular localization of acyl coenzyme A: dihydroxyacetone phosphate acyltransferase in rat liver peroxisomes (microbodies).

Upon differential centrifugation of rat liver homogenate, the enzyme acyl-CoA:dihydroxyacetone-phosphate acyltransferase (EC 2.3.1.42) was found to be localized in the light mitochondrial (L) fraction which is enriched with lysosomes and peroxisomes. Peroxisomes were separated from lysosomes in a density gradient centrifugation using rats which were injected with Triton WR 1339. By comparing th...

Properties of guinea pig liver peroxisomal dihydroxyacetone phosphate acyltransferase.

Purification and properties of acyl/alkyl dihydroxyacetone-phosphate reductase from guinea pig liver peroxisomes.

The peroxisomal acyl/alkyl dihydroxyacetone-phosphate reductase (EC 1.1.1.101) was solubilized and purified 5500-fold from guinea pig liver. The enzyme could be solubilized by detergents only at high ionic strengths in presence of the cosubstrate NADPH. Peroxisomes, isolated from liver by a Nycodenz step density gradient centrifugation, were first treated with 0.2% Triton X-100 to remove the so...

Acyl dihydroxyacetone phosphate: precursor of alkyl ethers.

1-0-Alkyl dihydroxyacetone phosphate is biosynthesised in guinea pig liver mitochondria and in rat brain microsomes by direct reaction of a long chain alcohol and acyl dihydroxyacetone phosphate. ATP and Mg* are stimulatory but coenzyme A is not necessary for the reaction. 1-0-Alkyl dihydroxyacetone phosphate (alkyl DHAP)l was shown to be biosynthesized from long chain alcohol and DHAP with ATP...