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)4HBSerineDirect50, 61
AI-2Indirect50
Redox substrates, aerotaxisUnknown19, 62
3,4-Dihydroxymandelic acidDirect51
    b1886 (Tar)4HBAspartateDirect61, 63
MaltoseIndirect57, 64
Metal ionsUnknown65
    b1421 (Trg)4HBRibose, galactoseIndirect66
    b1885 (Tap)4HBDipeptidesIndirect54
PyrimidinesUnknown52
    b3072 (Aer)PASAerotaxis, energyUnknown18, 19, 62
S. Typhimurium
    STM1919 (Tar)4HBCysteine, aspartateDirect70, 208
    STM4533 (Tsr)4HBCysteineUnknown70
    STM3577 (Tcp)4HBCitrateDirect209
PhenolUnknown
    STM3152 (McpB)4HBCystineUnknown70
    STM3216 (McpC)4HBCystineUnknown70
B. subtilis
    BSU10380 (HemAT)ProtoglobinAerotaxisUnknown17
    BSU13950 (McpC)dCache12 amino acidsDirect88, 89
PTS substratesIndirect194, 195
    BSU31240 (McpA)dCacheGlucose, α-methylglucosideUnknown9
    BSU31260 (McpB)dCache4 amino acidsDirect9