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Acylation of lysophosphatidylcholine in bovine heart muscle microsomes: purification and kinetic properties of acyl-CoA:1-acyl-sn-glycero-3-phosphocholine O-acyltransferase.

Abstract：

:Bovine heart muscle microsomes rapidly convert lysophosphatidylcholine (LPC) into phosphatidylcholine (PC) in the presence of oleoyl-CoA. Both substrates are incorporated into the product, although the rate of incorporation of radiolabel into PC from 1-[14C]palmitoyl-LPC was approximately threefold higher than the rate of incorporation from [14C]oleoyl-CoA. Furthermore, the rate of incorporation of radiolabel from [14C]LPC was stimulated fivefold by the presence of oleoyl-CoA. These results demonstrate the presence of both acyl-CoA:1-acyl-sn-glycero-3-phosphocholine O-acyltransferase (EC 2.3.1.23) and an LPC:LPC transacylase (EC 3.1.1.5) in microsomes. Separation of the two enzymatic activities and purification of the acyltransferase was achieved by a procedure involving extraction with 3-[3-cholamidopropyl)dimethylammonio)-1-propanesulfonate detergent and chromatography on DEAE-cellulose, Reactive blue agarose, and Matrex gel green A. The isolated acyltransferase was a single species of 64,000 Da as judged by polyacrylamide gel electrophoresis in the presence of dodecyl sulfate. The substrate specificity of the enzyme was studied by using a series of lysophospholipids as acyl acceptors and acyl-CoA derivatives as acyl donors. The enzyme was catalytically active with LPC as acyl acceptor but displayed little or no activity with lysophosphatidylethanolamine, lysophosphatidylinositol, or lysophosphatidylserine. Of the LPC derivatives tested, the highest activity was obtained with 1-palmitoyl-LPC. Wider specificity was exhibited for the nature of the acyl donor, for which arachidonoyl-CoA, linoleoyl-CoA, and oleoyl-CoA were highly active substrates. These properties of the acyltransferase are in accord with a role of the enzyme in determining the composition of PC in myocardium.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Sanjanwala M,Sun GY,Cutrera MA,MacQuarrie RA

doi

10.1016/0003-9861(88)90152-x

subject

Has Abstract

pub_date

1988-09-01 00:00:00

pages

476-83

issue

2

eissn

0003-9861

issn

1096-0384

pii

0003-9861(88)90152-X

journal_volume

265

pub_type

杂志文章

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