Reverse Reaction of Lysophosphatidylinositol Acyltransferase

Reverse Reaction of Lysophosphatidylinositol Acyltransferase
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溶血磷脂酰肌醇酰基转移酶的逆反应

DOI:
10.1074/jbc.m303391200
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发表时间:
2003
影响因子:
4.8
通讯作者:
K. Waku
K. Waku
中科院分区:
生物学2区
文献类型:
--
作者:
A. Yamashita;Masanobu Watanabe;Kazuaki Sato;T. Miyashita;Tomonari Nagatsuka;Hironori Kondo;N. Kawagishi;Hiroki Nakanishi;Ryouko Kamata;T. Sugiura;K. Waku

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微粒体中的CoA依赖性转酰活性在CoA存在下催化脂肪酸在磷脂和溶血磷脂之间转移,而不产生游离脂肪酸。我们研究了转酰系统的机制,使用部分纯化的酰基辅酶A:溶血磷脂酰肌醇(LPI)酰基转移酶(LPIAT)从大鼠肝微粒体,以测试我们的假设,无论是反向和正向反应的酰基辅酶A:溶血磷脂酰基转移酶参与辅酶A依赖性转酰过程。纯化的LPIAT组分表现出ATP非依赖性酰基辅酶A合成活性和PI产生辅酶A依赖性LPI,表明LPIAT可以反向操作以形成酰基辅酶A和LPI。通过纯化的LPIAT级分的LPI的CoA依赖性酰化需要PI作为酰基供体。此外,纯化的LPIAT和重组溶血磷脂酸酰基转移酶的组合可以重建PI和磷脂酸之间的CoA依赖性转酰作用。这些结果表明,CoA依赖性转酰化系统由以下组成:1)通过酰基-CoA:溶血磷脂酰基转移酶的反向作用从磷脂合成酰基-CoA;和2)通过酰基-CoA:溶血磷脂酰基转移酶的正向作用将脂肪酰基部分从新形成的酰基-CoA转移到溶血磷脂。
CoA-dependent transacylation activity in microsomes catalyzes the transfer of fatty acid between phospholipids and lysophospholipids in the presence of CoA without the generation of free fatty acid. We examined the mechanism of the transacylation system using partially purified acyl-CoA:lysophosphatidylinositol (LPI) acyltransferase (LPIAT) from rat liver microsomes to test our hypothesis that both the reverse and forward reactions of acyl-CoA:lysophospholipid acyltransferases are involved in the CoA-dependent transacylation process. The purified LPIAT fraction exhibited ATP-independent acyl-CoA synthetic activity and CoA-dependent LPI generation from PI, suggesting that LPIAT could operate in reverse to form acyl-CoA and LPI. CoA-dependent acylation of LPI by the purified LPIAT fraction required PI as the acyl donor. In addition, the combination of purified LPIAT and recombinant lysophosphatidic acid acyltransferase could reconstitute CoA-dependent transacylation between PI and phosphatidic acid. These results suggest that the CoA-dependent transacylation system consists of the following: 1) acyl-CoA synthesis from phospholipid through the reverse action of acyl-CoA:lysophospholipid acyltransferases; and 2) transfer of fatty acyl moiety from the newly formed acyl-CoA to lysophospholipid through the forward action of acyl-CoA:lysophospholipid acyltransferases.
DOI: --
发表时间: 1985
期刊: The Journal of biological chemistry
影响因子: --
作者:
Robinson,M;Blank,ML;Snyder,F
通讯作者: Snyder,F
DOI: 10.1016/s0021-9258(17)44891-5
发表时间: 1990-10
期刊: The Journal of biological chemistry
影响因子: --
作者:
Jack Coleman
通讯作者: Jack Coleman
大鼠肝微粒体中 2-酰基溶血磷脂酰肌醇的辅酶 A 依赖性、ATP 依赖性酰化。
DOI: 10.1016/0005-2760(91)90071-o
发表时间: 1991
期刊: Biochimica et biophysica acta
影响因子: --
作者:
Darnell,JC;Saltiel,AR
通讯作者: Saltiel,AR
来自牛睾丸膜的 CoA 依赖性硬脂酰转酰基酶的底物特异性。
DOI: --
发表时间: 1992
期刊: The Journal of biological chemistry
影响因子: --
作者:
Itabe,H;King,WC;Reynolds,CN;Glomset,JA
通讯作者: Glomset,JA
关于来自牛睾丸膜的硬脂酰特异性转酰基酶与共纯化酰基转移酶之间的关系。
DOI: 10.1021/bi971749y
发表时间: 1998
期刊: Biochemistry.
影响因子: --
作者:
Hollenback,D;Glomset,JA
通讯作者: Glomset,JA