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Structure of chimeric SspB-SpaP polypeptides Spac4 and Spac5. Spac4 is composed of SspB residues 1 to 1166 fused to residues 1167 to 1500 of SpaP. Spac5 contains residues 1 to 1250 of SspB fused to residues 1251 to 1500 from SpaP. The region of SspB encompassing residues 1167 to 1250 (BAR) mediates the in vitro adherence of P. gingivalis cells to S. gordonii (2). Conserved alanine-rich and proline-rich repetitive domains of SspB and SpaP are labeled HR and PR, respectively.
