0 −5.4 nd −4.5 nd nd SGO_0211 −4.1 nd nd nd nd nd SGO_0854 −2.7 −5.3 −5.4 −2.6 −2.7 −0.1 SGO_0855 −0.7 −0.5 nd 0.3 nd nd SGO_0966 −1.3 NVP-BSK805 concentration nd nd nd nd nd SGO_1148 −2.7 nd nd nd nd nd SGO_2105 −1.9 −6.9 −6.4 −5.0 −4.4 0.6 Bold: statistically significant difference, all ratios are log2. nd: not detected in one or more of the compared samples. While the short fimbriae of Pg have been found to bind to Sg via SspB, the long fimbriae bind to streptococci using the metabolic
protein glyceraldehyde-3-phosphate dehydrogenase, Gap [23]. Sg GAPDH, SGO_0207, shows increased protein levels with SgFn, SgPg, and SgPgFn vs Sg and may indicate an increased need for Gap mediated inter-species adhesion in Erismodegib the mixed samples. However, Gap functions not only as an adhesin but is also part
of the glycolysis pathway. The rest of the pathway showed increased levels and the increases in GAPDH may be related to its metabolic function rather than binding. This would be consistent with the reduced levels seen with the other adhesins. Despite the inconsistent detection of many of the known adhesins, overall, adhesion protein levels appear to be down in the mixed species samples. This is consistent with earlier studies showing that after initial contact, organisms in communities down-regulate adhesin expression [24]. Surface proteins and cell wall synthesis In addition to proteins with known functions in binding, many proteins predicted to be located on the cell surface were found at significantly different levels in the CP-690550 cost community samples. Table
4 shows significant differences, mostly lower, in many of the detected surface proteins between the community samples Reverse transcriptase and Sg alone. There are also numerous changes in proteins predicted to participate in cell wall biosynthesis (Table 4). Comparing community to Sg samples both increased and decreased protein levels are seen, though SgPgFn vs Sg was skewed towards reduced levels. Proteins for synthesis and attachment of the cell membrane sugar rhamnose show an interesting pattern. The results for these proteins are shown in Table 5. Rhamnose synthesizing proteins show generally increased levels with SgFn, SgPg, and SgPgFn compared to Sg alone with even higher levels in the Fn community than with Pg or PgFn. However, the rhamnosyltransferase, SGO_1026, which would attach rhamnose to the cell membrane, is down compared to Sg. One possible explanation is a shift between different rhamnosyltransferases. Sg has three, SGO_1021, SGO_1022, and SGO_1026. We failed to detect SGO_1021 or SGO_1022 in all but the Sg single species controls.