In only eight cases were the spectral counting trend and summed intensity trend significantly in opposite directions for the same protein (PGN 0329, 0501, 1094, 1341, 1637, 1733, 2065). The integrated relative abundance trends found 403 gene products with evidence of lower relative abundance change and 89 at higher relative abundance. For purposes of examining the totals for combined trends, if an abundance change was called as significant (red or green in Additional file 1: Table ST1) in one measurement, it was considered significant for the above combined totals only if the ratio of the other measurement

showed the same direction of abundance change, with a log2 ratio of ± 0.1 or greater regardless of the q-value in the second measurement. The experimental data for

differential protein abundance are shown in Fig. 2 as a pseudo M/A plot [28, 29] selleck chemical with a LOWESS curve fit [30]. The same data are plotted in Fig. 3 as open reading frames according to PGN numbers from the ATCC 33277 genome annotation [31]. A complete listing of all proteins, their abundance ratios relative SCH772984 supplier to P. gingivalis controls incubated alone under the same conditions as determined by spectral counting and summed signal intensity [27, 32, 33], and q-values, are given in Additional file 1: Table ST1. Qualitative identifications for proteins secreted by P. gingivalis in the 3-species community but not by P. gingivalis alone are given Additional file 1: Table ST2. Additional file 1: Figs. SF1, SF2, SF3, SF4, SF5 and SF6 and explanatory notes provide more detailed technical information regarding reproducibility of the biological replicates and the adequacy of sampling depth. To assess Progesterone global sampling depth, average spectral counts were calculated by summing all spectral count numbers for all P. gingivalis proteins in the FileMaker

script output described under Methods and dividing by the total number of P. gingivalis proteins in that file. The average redundant spectral count number for peptides unique to a given ORF for P. gingivalis alone was 80, for P. gingivalis in the community it was 64. The lower number of counts observed for P. gingivalis proteins in the community is consistent with the added sampling demands placed on the analytical system by sequence overlaps in the proteomes of all three microbes and thus the smaller number of unique proteolytic fragments predicted. More discussion of this topic is given in the explanatory notes [see Additional file 1]. Spectral count values for individual proteins are given in data Additional file 1: Table ST1. Details regarding access to mass spectrometry data for individual peptides and their SEQUEST database searching scores [34], p-values and q-values are given in the notes to the data tables [see Additional file 1]. Figure 2 Pseudo M versus A plot [28, 29] of the average protein abundance ratios over all replicates for the P. gingivalis – F. nucleatum-S. gordonii / P.