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Curvature-engineered Escherichia coli bilayers reveal critical lipid head-group size for membrane protein function in vivo
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Manuscript (Other academic)
URN: urn:nbn:se:su:diva-24462OAI: diva2:197568
Part of urn:nbn:se:su:diva-7056Available from: 2007-09-13 Created: 2007-09-04 Last updated: 2010-01-13Bibliographically approved
In thesis
1. The advantages of being small: Glycosyltransferases in many dimensions and glycolipid synthesis in Mycoplasma Pneumoniae
Open this publication in new window or tab >>The advantages of being small: Glycosyltransferases in many dimensions and glycolipid synthesis in Mycoplasma Pneumoniae
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The synthesis and breakdown of sugars is one of the most important functions in Nature. Consequently, sugar structures are used both as energy storage and as building blocks to stabilise and protect the cell. The formation of these structures is performed by glycosyltransferases (GT), an enzyme group structurally conserved within all kingdoms. Until now, only two different folds have been discovered by crystallisation of GTs, i.e. GT-A and GT-B. A third fold family has however been proposed by fold predictions. In this thesis, a multivariate data analysis was successfully used in classifying and predicting both fold and reaction mechanism (inverting or retaining) of GTs. This method was also used to obtain information about the separating parameters for the reaction mechanism classification. This information could be traced back to the amino acid sequence. The method could as well be used to analyse and identify the properties of membrane binding regions of GTs, and subsequently distinguish soluble from membrane-associated enzymes. Most functionally characterised enzymes only use one substrate, synthesising one product. Mycoplasma pneumoniae, a common human pathogen with a small genome has only three proposed GTs. The bacterium was, however expected to have a greater number of GTs, due to its ability to make both glycolipids and capsule. Here we have determined the function of one of these enzymes, MPN483 and discovered its ability to both use different acceptors, and make elongated glycolipids with up to three galactose residues, with both DAG and ceramide as the base. Many of the synthesised glycolipids were also found to be immunogenic, hence showing their biological importance. The properties of lipids are known to be important for the function of a biological membrane. We have here shown that not only the charge but also the shape of the lipids are important for several protein mediated membrane processes in Echerichia coli, such as the function of the LacY.

Place, publisher, year, edition, pages
Stockholm: Institutionen för biokemi och biofysik, 2007. 56 p.
Glycosyltransferase, lipid, membrane, glycolipid, ACC, PLS-DA
National Category
Biochemistry and Molecular Biology
Research subject
urn:nbn:se:su:diva-7056 (URN)978-91-7155-503-8 (ISBN)
Public defence
2007-10-05, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 12 A, Stockholm, 10:00
Available from: 2007-09-13 Created: 2007-09-04Bibliographically approved

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