Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/59305
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Type: Journal article
Title: Holocarboxylase synthetase: Correlation of protein localisation with biological function
Author: Bailey, L.
Wallace, J.
Polyak, S.
Citation: Archives of Biochemistry and Biophysics, 2010; 496(1):45-52
Publisher: Academic Press Inc
Issue Date: 2010
ISSN: 0003-9861
1096-0384
Statement of
Responsibility: 
L.M. Bailey, J.C. Wallace and S.W. Polyak
Abstract: Holocarboxylase synthetase (HCS) governs the cellular fate of the essential micronutrient biotin (Vitamin H or B7). HCS is responsible for attaching biotin onto the biotin-dependent enzymes that reside in the cytoplasm and mitochondria. Evidence for an alternative role, viz the regulation of gene expression, has also been reported. Recent immunohistochemical studies reported HCS is primarily nuclear, inconsistent with the location of HCS activity. Improved understanding of biotin biology demands greater knowledge about HCS. Here, we investigated the localisation of HCS and its isoforms. Three variants were observed that differ at the N-terminus. All HCS isoforms were predominantly non-nuclear, consistent with the distribution of biotin protein ligase activity. Unlike the longer constructs, the Met(58) isoform was also detected in the nucleus--a novel observation suggesting shuttling activity between nucleus and cytoplasm. We resolved that the previous controversies in the literature are due to specificity and detection limitations that arise when using partially purified antibodies.
Keywords: Holocarboxylase synthetise; Enzyme; Antibody; Cellular localisation; Isoforms
Rights: Crown Copyright 2010 Published by Elsevier Inc. All rights reserved.
RMID: 0020095150
DOI: 10.1016/j.abb.2010.01.015
Description (link): http://www.elsevier.com/wps/find/journaldescription.cws_home/622787/description#description
Appears in Collections:Molecular and Biomedical Science publications

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