An induced folding process characterizes the partial-loss of function mutant LptAI36D in its interactions with ligands.
Biochim Biophys Acta
; 1854(10 Pt A): 1451-7, 2015 Oct.
Article
em En
| MEDLINE
| ID: mdl-26123264
ABSTRACT
Lipopolysaccharide (LPS) is an essential glycolipid of the outer membrane (OM) of Gram-negative bacteria with a tripartite structure lipid A, oligosaccharide core and O antigen. Seven essential LPS-transport proteins (LptABCDEFG) move LPS to the cell surface. Lpt proteins are linked by structural homology, featuring a ß-jellyroll domain that mediates protein-protein interactions and LPS binding. Analysis of LptA-LPS interaction by fluorescence spectroscopy is used here to evaluate the contribution of each LPS moiety in protein-ligand interactions, comparing the wild-type (wt) protein to the I36D mutant. In addition to a crucial role of lipid A, an unexpected contribution emerges for the core region in recognition and binding of Lpt proteins.
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Base de dados:
MEDLINE
Assunto principal:
Proteínas Recombinantes de Fusão
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Proteínas de Transporte
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Lipopolissacarídeos
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Proteínas de Escherichia coli
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Escherichia coli K12
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Mutação
Idioma:
En
Revista:
Biochim Biophys Acta
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Itália