Stereochemical course of the methylation of the polygalacturonic acid carboxyl groups of pectin.

Stereochemical course of the methylation of the polygalacturonic acid carboxyl groups of pectin.
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果胶聚半乳糖醛酸羧基甲基化的立体化学过程。

DOI:
10.1016/0003-9861(81)90006-0
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发表时间:
1981
影响因子:
3.9
通讯作者:
Floss,HG
Floss,HG
中科院分区:
生物学3区
文献类型:
--
作者:
Woodard,RW;Weaver,J;Floss,HG

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以s -腺苷蛋氨酸(AdoMet)为载体,以不对称排列方式携带1h、2H、3H标记的手性甲基,研究了果胶中甲基转移到聚半乳糖醛酸形成甲酯的立体过程。该底物的两种非对映体与从绿豆芽中获得的颗粒酶制剂孵育得到相应的果胶。这些物质在一系列立体化学反应中被降解,这些反应将甲氧基转化为醋酸酯的甲基,然后对其结构进行分析。结果表明,甲基从AdoMet的硫到羧基氧的转移是通过甲基的构型反转进行的。
The steric course of the methyl group transfer to polygalacturonic acid to form the methyl ester group in pectin was studied usingS-adenosylmethionine (AdoMet) carrying a methyl group made chiral by labeling with1H,2H,3H, in an asymmetric arrangement. The incubation of the two diastereomers of this substrate with a particulate enzyme preparation obtained fromPhaseolus aureus(mung bean) shoots gave the corresponding pectins. These were degraded in a series of stereochemically unambiguous reactions that converted the methoxy group into the methyl group of acetate, which was then analyzed for its configuration. The results indicate that the transfer of the methyl group from the sulfur of AdoMet to the oxygen of the carboxyl group proceeds with inversion of configuration of the methyl group.
携带手性甲基的甲硫氨酸的合成及其在测定吲哚霉素生物合成过程中吲哚丙酮酸酶促 C-甲基化的空间过程中的用途。
DOI: 10.1021/ja00443a062
发表时间: 1977
影响因子: 15
作者:
L. Mascaro;R. Horhammer;S. Eisenstein;L. Seller;K. Mascaro;H. Floss
通讯作者: H. Floss
DOI: --
发表时间: 1980
期刊:
影响因子: --
作者:
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发表时间: 1980-10
期刊: The Journal of biological chemistry
影响因子: --
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影响因子: 4.8
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发表时间: 1966
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