Identification of a novel TCSS in SS2 strain ZY05719. (A) Homology analyses of the ZY05719_02075, ZY05719_02080, and ZY05719_02085 proteins by the protein BLAST algorithm. The identities of the amino acid sequences encoded by each gene are shown between SS2 strain ZY05719 and S. aureus strain Mu50. (B) Predicted three-dimensional structure and conserved domains of the ZY05719_02080 protein, as determined using the SWISS-MODEL online server. The HAMP domain that potentially mediates transmembrane signal transduction, the DHp domain containing a conserved histidine residue, and the CA domain were identified by sequence alignment and are labeled accordingly. (C) Three-dimensional structure and conserved domains of the ZY05719_02085 protein, predicted using the SWISS-MODEL online server. A REC domain catalyzing phosphoryl and an HTH domain used for DNA binding were identified by sequence alignment and are labeled accordingly.