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Small-angle X-ray scattering analysis of pneumococcal lipoteichoic acid phase structure
W Fischer1, S Markwitz, H Labischinski
1Institut für Biochemie, Friedrich-Alexander Universität, Erlangen, Germany.
European Journal of Biochemistry
|March 15, 1997
Summary
Lipoteichoic acid (LTA) from Streptococcus pneumoniae forms spherical micelles approximately 23 nm in diameter, containing about 150 molecules. Micelle structure is primarily determined by the lipid anchor, not the hydrophilic chain complexity.
Area of Science:
- Microbiology
- Biochemistry
- Structural Biology
Background:
- Lipoteichoic acids (LTAs) are crucial cell wall components in Gram-positive bacteria.
- Streptococcus pneumoniae LTA possesses a unique structure with a positively charged anchor and complex hydrophilic chain.
Purpose of the Study:
- To analyze the micelle structure of lipoteichoic acid from Streptococcus pneumoniae.
- To determine the molecular parameters and assembly of LTA micelles.
Main Methods:
- X-ray scattering analysis
- Small-angle scattering analysis
Main Results:
- Lipoteichoic acid (LTA) from Streptococcus pneumoniae forms spherical micelles (approx. 23 nm diameter) with ~150 molecules per micelle.
- Micelle size is consistent across varying ionic strengths.
- The hydrophilic shell thickness is approximately 8.5 nm, with each repeat unit contributing ~1.2 nm.
Conclusions:
- The supramolecular structure of LTA micelles is dictated by the diacylglycerol anchor, not the hydrophilic chain.
- This finding is consistent across different LTA structures and bacterial species.