Download MendeleyStructural and Functional Analysis of the N-terminal Domain of the Streptococcus gordonii Adhesin Sgo0707
Nylander, A., Svensater, G., Senadheera, D.B., Cvitkovitch, D.G., Davies, J.R., Persson, K.(2013) PLoS One 8: e63768-e63768
- PubMed: 23691093
- DOI: https://doi.org/10.1371/journal.pone.0063768
- Primary Citation of Related Structures:
4IGB - PubMed Abstract:
The commensal Streptococcus gordonii expresses numerous surface adhesins with which it interacts with other microorganisms, host cells and salivary proteins to initiate dental plaque formation. However, this Gram-positive bacterium can also spread to non-oral sites such as the heart valves and cause infective endocarditis. One of its surface adhesins, Sgo0707, is a large protein composed of a non-repetitive N-terminal region followed by several C-terminal repeat domains and a cell wall sorting motif. Here we present the crystal structure of the Sgo0707 N-terminal domains, refined to 2.1 Å resolution. The model consists of two domains, N1 and N2. The largest domain, N1, comprises a putative binding cleft with a single cysteine located in its centre and exhibits an unexpected structural similarity to the variable domains of the streptococcal Antigen I/II adhesins. The N2-domain has an IgG-like fold commonly found among Gram-positive surface adhesins. Binding studies performed on S. gordonii wild-type and a Sgo0707 deficient mutant show that the Sgo0707 adhesin is involved in binding to type-1 collagen and to oral keratinocytes.
Organizational Affiliation:
Department of Odontology, Division of Oral Microbiology, Umeå University, Umeå, Sweden.
