Title: Streptococcus gordonii Type I Lipoteichoic Acid Contributes to Surface Protein Biogenesis

Journal Article · · mSphere
ORCiD logo [1]; ORCiD logo [2];  [3];  [4];  [5];  [3];  [3];  [3];  [2];  [3];  [6]
  1. Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Diagnostic and Biological Sciences, School of Dentistry; DOE/OSTI
  2. Pennsylvania State Univ., State College, PA (United States). Dept. of Biochemistry and Molecular Biology
  3. Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Diagnostic and Biological Sciences, School of Dentistry
  4. Univ. of Malmo (Sweden). Dept. of Oral Biology, Faculty of Odontology
  5. Univ. of Malmo (Sweden). Dept. of Oral Biology, Faculty of Odontology
  6. Univ. of Iowa, Iowa City, IA (United States)

Lipoteichoic acid (LTA) is an abundant polymer of the Gram-positive bacterial cell envelope and is essential for many species. Whereas the exact function of LTA has not been elucidated, loss of LTA in some species affects hydrophobicity, biofilm formation, and cell division. Using a viable LTA-deficient strain of the human oral commensal Streptococcus gordonii, we demonstrated that LTA plays an important role in surface protein presentation. Cell wall fractions derived from the wild-type and LTA-deficient strains of S. gordonii were analyzed using label-free mass spectroscopy. Comparisons showed that the abundances of many proteins differed, including (i) SspA, SspB, and S. gordonii 0707 (SGO_0707) (biofilm formation); (ii) FtsE (cell division); (iii) Pbp1a and Pbp2a (cell wall biosynthesis and remodeling); and (iv) DegP (envelope stress response). These changes in cell surface protein presentation appear to explain our observations of altered cell envelope homeostasis, biofilm formation, and adhesion to eukaryotic cells, without affecting binding and coaggregation with other bacterial species, and provide insight into the phenotypes revealed by the loss of LTA in other species of Gram-positive bacteria. We also characterized the chemical structure of the LTA expressed by S. gordonii. Similarly to Streptococcus suis, S. gordonii produced a complex type I LTA, decorated with multiple d-alanylations and glycosylations. Hence, the S. gordonii LTA appears to orchestrate expression and presentation of cell surface-associated proteins and functions.

Research Organization:
Univ. of Georgia, Athens, GA (United States); Univ. of Georgia, Athens, GA (United States). Complex Carbohydrate Research Center
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0015662
OSTI ID:
1626161
Journal Information:
mSphere, Journal Name: mSphere Journal Issue: 6 Vol. 4; ISSN 2379-5042
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
English

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