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Table 3 Input domains found in Azospirillum sensing HKs

From: Genome-wide survey of two-component signal transduction systems in the plant growth-promoting bacterium Azospirillum

Strains A. lipoferum 4B Azospirillum sp. B510 A. brasilense Sp245 A. brasilense CBG497 Putative signal(s) detected
HK typea ClaHK HyHK ClaHK HyHK ClaHK HyHK ClaHK HyHK  
Abundant input domains          
PAS / PAC 43 42 / 1 35 35 / 3 46 71 35 71 Small molecules, ions, gases, light, and redox state sensing
HAMP 12 18 18 9 14 11 11 13 Signal transduction
Uncommon input domains          
GAF 3 4 3 4 7 4 5 4 Redox or oxygen sensing; cGMP binding
PHY 1 - 1 1 1 1 1 1 Tetrapyrroles; light-sensing
CHASE 3 - 2 - 3 - 2 - Small molecules recognition
MASE 1 1 2 - 1 - 1 1 Membrane associated sensor
2CSK_N 1 - 3 - 1 - 1 - Unknown; commonly found in N-terminal parts of HK
Cache - 4 - 4 2 3 - - Small molecules recognition
MHYT - 2 - 3 - - - 2 Putatively involved in metal sensing
cNMP_binding 1 - 1 - - - - - Cyclic nucleotide monophosphate-binding
S_TKc 1 - 1 - - - - - Serine/Threonine kinase catalytic domain
SBP_bac_1 1 - 1 - - - 1 - Bacterial extracellular solute binding protein
CheB methylesterase - - 1 2 - - - - Chemotaxis
MeTRC - - 1 2 - - - - Methyl transferase
NIT - - 1 - - - - - Nitrate and nitrite responsive
PBPb - - - - 1 - 1 - High-affinity periplasmic solute-binding protein
  1. a ClaHK Classic Histidine Kinase, HyHK Hybrid Histidine Kinase