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Zoekopdracht: faculteit: "ACTA" en publicatiejaar: "2008"

AuteursJ.T.D. Leito, A.J.M. Ligtenberg, K. Nazmi, J.M.A. de Blieck-Hogervorst, E.C.I. Veerman, A. van Nieuw Amerongen
TitelA common binding motif for various bacteria of the bacteria-binding peptide SRCRP2 of DMBT1/gp-340/salivary agglutinin
TijdschriftBiological chemistry
SamenvattingSalivary agglutinin (DMBT1SAG) is identical to lung glycoprotein-340 and encoded by the deleted in malignant brain tumors-1 gene. It is a member of the scavenger receptor cysteine-rich (SRCR) superfamily, proteins that have one or more SRCR domains. Salivary agglutinin plays a role in oral innate immunity by the binding and agglutination of oral streptococci. Streptococcus mutans has been shown to bind to a 16-mer peptide (QGRVEVLYRGSWGTVC) located within the SRCR domains. Within this peptide, designated SRCR peptide 2, residues VEVL and W are critical for binding. The aim of this study was to investigate binding of DMBT1SAG to other bacteria. Therefore, interaction between a series of bacteria and DMBT1SAG, SRCR peptide 2 and its alanine substitution variants was investigated in adhesion and agglutination assays. For different bacteria there was a highly significant correlation between adhesion to DMBT1SAG and adhesion to SRCR peptide 2, suggesting that SRCR peptide 2 is the major bacteria-binding site. An alanine substitution scan showed that eight amino acids are involved in binding (xRVEVLYxxSWxxxx). The binding motifs varied for different species, but the residues VxVxY and W are always present. In conclusion, a common binding motif (RVEVLYxxxSW) within the SRCR domains is responsible for the broad bacteria-binding spectrum of DMBT1SAG
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