Browse by author
Lookup NU author(s): Dr Sharlene Watkins, Dr Ian West, Professor Robert Wilkinson, Dr Trevor Thomas
Full text for this publication is not currently held within this repository. Alternative links are provided below where available.
Objectives: To identify a thiol protein that is abnormal in a subgroup of essential hypertensive (EHT) patients who have a strong family history of hypertension and cardiovascular disease and have a low Km of erythrocyte Na/Li countertransport (CT). Methods: To detect biotin maleimide labelling of a key thiol protein to investigate its reaction with N-ethylmaleimide (NEM) in normal and EHT erythrocytes. Results: The thiol protein of 33 kDa apparent molecular weight (p33) identified by the loss of labelling with biotin maleimide was identified as tropomyosin due to its retarded running in 6 mol/I urea gels and immunoblotting. The NEM reaction with p33 detected by loss of subsequent biotin maleimide labelling is biphasic in normal control erythrocytes with the rate in the first 30 s double that after 30 s. In EHT erythrocytes NEM reaction (1) after 30 s is faster than normal and (2) in the first 30 s causes a paradoxical increase in apparent biotin maleimide labelling. In normal control erythrocytes, the loss of biotin maleimide labelling with NEM reaction or the faster phenylmaleimide reaction follows the same time course as the decrease in Km of Na/Li CT. Conclusions: NEM reaction with p33 requires two thiols. Only the cytoskeletal form of tropomyosin from the TM3 gene has more than one thiol group and agrees with SDS-PAGE mobility. Tropomyosin is a strong candidate to explain the familial abnormality in EHT with abnormal Na/Li CT and it could explain many of the characteristics of this disease. © 2001 Lippincott Williams & Wilkins.
Author(s): Thomas TH; Wilkinson R; West IC; Watkins SL
Publication type: Article
Publication status: Published
Journal: Journal of Hypertension
Year: 2001
Volume: 19
Issue: 3
Pages: 485-493
Print publication date: 01/01/2001
ISSN (print): 0263-6352
ISSN (electronic): 1473-5598
Publisher: Lippincott Williams & Wilkins
URL: http://dx.doi.org/10.1097/00004872-200103000-00017
DOI: 10.1097/00004872-200103000-00017
PubMed id: 11288819
Altmetrics provided by Altmetric
