Table 7. Genome-wide survey of F. alocis cell wall anchored proteins.
Features | F. alocis ATCC strain (n = 50) | F. alocis D-62D strain (n = 56) |
---|---|---|
Export features | ||
Signal sequence a) | 5 | 14 |
Signal peptidase I cleavageb) | 4 | 9 |
Transmembrane helix domain c) | 7 | 15 |
Cell wall anchored proteins | ||
N or C-terminally anchored proteins d) | 8 | 10 |
Sortase A. LP×TG anchors e) | – | 2 |
Atypical sortase anchors e) | 1 | 3 |
Sortase B motif e) | 1 | – |
NP(Q/K)(T/S)(N/G/S)(D/A) | ||
Sortase D motif e) | – | 1 |
LP×TA | ||
Peptidoglycan-binding domains f) | 10 | 20 |
LysM domains g) | 2 | 4 |
Lipoprotein anchors h) | – | 2 |
GW repeats i) | 5 | 10 |
WxL domains j) | 3 | 6 |
Glycin-rich C terminal motif k) | – | 25 |
Signal sequence prediction was done with the hidden Markov model in SignalP3.0 [28], with p values of > 0.95 as the cutoff.
Cleavage site prediction was done with the neural network model in SignalP3.0, with Cmax values of > 0.52 and Ymax values of > 0.32 as cutoffs.
TMMH prediction was made using SignalP3.0 [28].
The N terminal and C terminal domains were identified using the HMM.
LPXTG anchors, atypical sortase anchors, sortase D motifs were predicted by the hidden Markov model for sortase substrates [32].
From the Pfam database, with a cutoff E value of ≤ 10−5.
Lipoprotein prediction was done as described by Sutcliffe and Harrington [31].
Manual screening for the presence of GW residues in repetitive regions was performed.
Prediction based on the presence of the [LI]TW[TS]L motif in the C-terminal sequence.
Sequence alignment and C terminal motif identifications were made using MEGA version 4.0 [25].