TABLE 1

Functionally characterized chemoreceptors of E. coli, S. Typhimurium, and B. subtilis

Locus tag (chemoreceptor name)LBD typeEffector(s)Binding mode(s)Reference(s)
E. coli
    b4355 (Tsr)4HBSerineDirect 50, 61
AI-2Indirect 50
Redox substrates, aerotaxisUnknown 19, 62
3,4-Dihydroxymandelic acidDirect 51
    b1886 (Tar)4HBAspartateDirect 61, 63
MaltoseIndirect 57, 64
Metal ionsUnknown 65
    b1421 (Trg)4HBRibose, galactoseIndirect 66
    b1885 (Tap)4HBDipeptidesIndirect 54
PyrimidinesUnknown 52
    b3072 (Aer)PASAerotaxis, energyUnknown 18, 19, 62
S. Typhimurium
    STM1919 (Tar)4HBCysteine, aspartateDirect 70, 208
    STM4533 (Tsr)4HBCysteineUnknown 70
    STM3577 (Tcp)4HBCitrateDirect 209
PhenolUnknown
    STM3152 (McpB)4HBCystineUnknown 70
    STM3216 (McpC)4HBCystineUnknown 70
B. subtilis
    BSU10380 (HemAT)ProtoglobinAerotaxisUnknown 17
    BSU13950 (McpC)dCache12 amino acidsDirect 88, 89
PTS substratesIndirect 194, 195
    BSU31240 (McpA)dCacheGlucose, α-methylglucosideUnknown 9
    BSU31260 (McpB)dCache4 amino acidsDirect 9