Erythrocyte membrane thiol proteins associated with changes in the kinetics of Na/Li countertransport: a possible molecular explanation of changes in disease.

Abstract:

BACKGROUND:Abnormal erythrocyte Na/Li countertransport is associated with diseases such as essential hypertension and diabetic renal disease. Although it seems unlikely that Na/Li countertransport contributes to any disease process, it may be abnormal because of a change in the cell membrane that is part of the disease process. METHODS:We have shown that Na/Li countertransport kinetics are modified by two types of thiol group. One of these, which we have called 'type 1', is rapidly alkylated by N-ethylmaleimide to give a kinetic pattern similar to that in the above diseases. RESULTS:AtpH 6 and 2 degrees C, both N-ethylmaleimide and iodoacetamide cause the K(m) of Na/Li countertransport to decrease to completion in 300s, with 78% (SEM 6%) of the decrease occurring in 30s. Using these reaction conditions, N-ethylmaleimide reacted with a unique thiol group on a 33-kD protein, blocking its subsequent reaction with biotin maleimide. This 33-kD protein was present in rabbit erythrocytes, which have high levels of Na/Li countertransport, but absent from rat erythrocytes, which have no Na/Li countertransport. Iodoacetyl biotin labelled a 60-kD protein that was specifically blocked by iodoacetamide. CONCLUSION:We suggest that these proteins are members of a cluster of membrane proteins that can modify Na/Li countertransport and may have a functional role in the disease processes.

journal_name

Eur J Clin Invest

authors

Thomas TH,Rutherford PA,Vareesangthip K,Wilkinson R,West IC

doi

10.1046/j.1365-2362.1998.00276.x

subject

Has Abstract

pub_date

1998-04-01 00:00:00

pages

259-65

issue

4

eissn

0014-2972

issn

1365-2362

journal_volume

28

pub_type

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