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Functional expression of the CMP-sialic acid transporter in Escherichia coli and its identification as a simple mobile carrier.
- Source :
-
Glycobiology [Glycobiology] 2006 Jan; Vol. 16 (1), pp. 73-81. Date of Electronic Publication: 2005 Aug 23. - Publication Year :
- 2006
-
Abstract
- The architectural conservation of nucleotide sugar transport proteins (NSTs) enabled the theoretical prediction of putative NSTs in diverse gene databases. In the human genome, 17 NST sequences have been identified but only six have been unequivocally characterized with respect to their transport specificities. Defining transport characteristics of recombinant NSTs has become a major challenge because true zero background systems are widely absent. Production of recombinant NSTs in heterologous systems has developed multifunctionality for some NSTs leading to a novel level of complexity in the field. Assuming that (1) the specificity of NSTs is determined at the primary sequence level and (2) the proteins are autonomously functional units, final definition of the substrate specificity will depend on the use of isolated transport proteins. Herein, we describe the first report of the functional expression of mouse CMP-sialic acid transporter (CST) in Escherichia coli and thus provide significant progress towards the production of transporter proteins in quantities suitable for functional and structural analyses. Recovery of the active NST from inclusion bodies was achieved after solubilization with 8 M urea and stepwise renaturation. After reconstitution into phospholipid vesicles, the recombinant protein demonstrated specific transport for CMP-N-acetylneuraminic acid (CMP-Neu5Ac) with no transport of UDP-sugars. Kinetic studies carried out with CMP-Neu5Ac and established CMP-Neu5Ac antagonist's evaluated natural conformation of the reconstituted protein and clearly demonstrate that the transporter acts as a simple mobile carrier.
- Subjects :
- Animals
Biological Transport genetics
Cytidine Monophosphate metabolism
Escherichia coli metabolism
Inclusion Bodies genetics
Inclusion Bodies metabolism
Mice
Nucleotide Transport Proteins genetics
Protein Folding
Recombinant Proteins genetics
Recombinant Proteins metabolism
Substrate Specificity
Cytidine Monophosphate analogs & derivatives
Escherichia coli genetics
Gene Expression
Nucleotide Transport Proteins metabolism
Sialic Acids metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 0959-6658
- Volume :
- 16
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Glycobiology
- Publication Type :
- Academic Journal
- Accession number :
- 16118285
- Full Text :
- https://doi.org/10.1093/glycob/cwj029