Involvement of thiol groups in the function of the dipeptide/proton cotransport system in rabbit renal brush-border membrane vesicles.
Involvement of thiol groups in the function of the dipeptide/proton cotransport system in rabbit renal brush-border membrane vesicles.
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硫醇基团参与兔肾刷状缘膜囊泡二肽/质子共转运系统的功能。
DOI:
10.1016/0005-2736(89)90493-8
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发表时间:
1989
期刊:
影响因子:
--
通讯作者:
Leibach,FH
中科院分区:
文献类型:
--
作者:
Miyamoto,Y;Tiruppathi,C;Ganapathy,V;Leibach,FH
The role of thiol groups in H+-gradient-dependent dipeptide transport in rabbit renal brush-border membrane vesicles was investigated using glycylsarcosine as the substrate. Treatment of the membrane vesicles with a thiol-group-reducing agent, dimercaptopropanol, stimulated Gly-Sar transport. On the other hand, treatment with thiol group oxidants such as 5,5′-dithiobis(2-nitrobenzoic acid), plumbagin and phenazine methosulfate inhibited Gly-Sar transport. These effects were irreversible, because washing the membranes after treatment failed to reverse the effects. Incubation of the membrane vesicles with phenylarsine oxide, a reagent which interacts specifically with vicinal dithiols, significantly inhibited Gly-Sar transport. In all cases, the stimulation or the inhibition of the dipeptide transport was primarily due to changes in the maximal velocity of the transport system, the apparent affinity constant remaining unaltered. These results demonstrate the involvement of one or more vicinal dithiol groups in the function of the renal dipeptide transport system and that these thiol groups must exist in reduced form to maintain maximal transport activity. In addition, these data indirectly suggest that a dithiol-disulfide interchange may play a role in the function of the renal dipeptide transport system.
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DOI:
--
发表时间:
1983
期刊:
Journal of General Microbiology
影响因子:
--
作者:
Y. Kawaoka;K. Otsuki;M. Tsubokura
通讯作者:
M. Tsubokura
影响因子:
64.8
作者:
Keith James;Peter Medawar
通讯作者:
Peter Medawar
影响因子:
9.4
作者:
K. Granfors
通讯作者:
K. Granfors
影响因子:
3.1
作者:
L. Mutharia;G. Crockford;W. C. Bogard;W. RobertE.;'. Hancock
通讯作者:
'. Hancock
影响因子:
9.4
作者:
K. Granfors;M. Viljanen;A. Toivanen
通讯作者:
A. Toivanen