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Structure of the C‐terminal domain of the surface antigen SpaP from the caries pathogen Streptococcus mutans

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SpaP is a 1500‐residue adhesin expressed on the surface of the caries‐implicated bacterium Streptococcus mutans. SpaP is a member of the antigen I/II (AgI/II) family of proteins expressed by oral streptococci. These surface proteins are crucial for the incorporation of streptococci into dental plaque. The structure of the C‐terminal domain of SpaP (residues 1136–1489) was solved and refined to 2.2 Å resolution with six molecules in the asymmetric unit. Similar to a related AgI/II structure, SpaP is stabilized by isopeptide bonds between lysine and asparagine side chains.
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Keywords: antigen I/II; dental plaque; isopeptide bonds

Document Type: Research Article

Affiliations: Department of Odontology, Umeå University, SE-901 87 Umeå, Sweden

Publication date: January 1, 2011

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