Pancreatic islet discrimination of hexose anomers. I. Steady-state computer simulation.

Pancreatic islet discrimination of hexose anomers. I. Steady-state computer simulation.
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己糖端基异构体的胰岛辨别。

DOI:
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发表时间:
1988
影响因子:
--
通讯作者:
D. Garfinkel
D. Garfinkel
中科院分区:
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文献类型:
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作者:
M. J. Achs;D. Garfinkel

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胰岛通过磷酸化葡萄糖并将糖酵解速率转化为分泌胰岛素的信号来检测葡萄糖水平。当D-葡萄糖水平低于22 mM时,α-异头体的胰岛素分泌大于β-异头体的胰岛素分泌。D-甘露糖的行为类似,但浓度高出近两倍。提出了两种解释:1)葡萄糖激酶,它具有相同的异头偏好,是主要的己糖磷酸化酶,并限制糖酵解速率。2)磷酸果糖激酶限制糖酵解,己糖激酶是磷酸化己糖的主要酶;磷酸果糖激酶的己糖二磷酸活化剂更容易从己糖磷酸的α-端基异构体合成。我们已经模拟了这两种替代品与一个详细的异头特定模型的己糖代谢糖酵解酶。对两种己糖的α-端基异构体的途径偏好用端基异构活性限制性葡糖激酶充分再现。其他机制没有再现所观察到的途径偏好。
Pancreatic islets detect glucose level by phosphorylating it and converting the glycolytic rate to a signal to secrete insulin. Insulin secretion is greater from the alpha- than from the beta-anomer when the D-glucose level is below 22 mM. D-mannose behaves similarly but at nearly twofold higher concentrations. Two explanations have been proposed: 1) glucokinase, which has the same anomeric preference, is the principal hexose phosphorylating enzyme and limits glycolytic rate. 2) Phosphofructokinase limits glycolysis and hexokinase is the principal enzyme phosphorylating hexose; hexosediphosphate activators of phosphofructokinase are more readily synthesized from alpha-anomers of hexose phosphates. We have simulated both alternatives with a detailed anomerically specific model of the hexose-metabolizing glycolytic enzymes. The pathway preference for alpha-anomer of both hexoses was adequately reproduced with anomerically active limiting glucokinase. The other mechanism did not reproduce the observed pathway preference.
朗格汉斯岛葡萄糖激酶的色谱分离度和动力学表征。
DOI: 10.1073/pnas.80.1.85
发表时间: 1983
影响因子: 11.1
作者:
Meglasson,MD;Burch,PT;Berner,DK;Najafi,H;Vogin,AP;Matschinsky,FM
通讯作者: Matschinsky,FM
β-D-果糖 2,6-二磷酸与磷酸果糖激酶和果糖-1,6-二磷酸酶相互作用的结合研究。
DOI: --
发表时间: 1983
期刊: The Journal of biological chemistry
影响因子: --
作者:
Kitajima,S;Uyeda,K
通讯作者: Uyeda,K
通过葡萄糖激酶区分来自肝脏和可移植胰岛素瘤的葡萄糖端基异构体。
DOI: --
发表时间: 1983
期刊: The Journal of biological chemistry
影响因子: --
作者:
Meglasson,MD;Matschinsky,FM
通讯作者: Matschinsky,FM
DOI: 10.1042/bj2210759
发表时间: 1984
期刊: The Biochemical journal
影响因子: --
作者:
Sener,A;VanSchaftingen,E;VandeWinkel,M;Pipeleers,DG;Malaisse-Lagae,F;Malaisse,WJ;Hers,HG
通讯作者: Hers,HG