Parameter	Meaning	Estimated Value	Units
kcS1	Permeability of the Pdu MCP to propionaldehyde	10−5	cm/s
kcS2	Permeability of the Pdu MCP to 1,2-PD	10−5	cm/s
Rb	Radius of the bacterial cell	5 × 10−5	cm
Rc	Radius of the Pdu MCP	10−5 81	cm
D	Diffusivity of metabolites in the cellular milieu	10−5 82	cm2/s
kmS1	Permeability of the cell membrane to propionaldehyde	10−2 80	cm/s
kmS2	Permeability of the cell membrane to 1,2-PD	10−2 80	cm/s
kcatCDE	Maximum reaction rate of a PduCDE active site	3 × 102 83	1/s
NCDE	Number of PduCDE enzymes per cell	1.5 × 103 81	Per cell
KMCDE	Michaelis-Menten constant of PduCDE	5 × 102 83	μM
kcatPQ	Maximum reaction rate of a PduP/Q active site	5584	1/s
KMPQ	Michaelis-Menten constant of PduP/Q	1.5 × 104 84	μM
NPQ	Number of PduP/Q enzymes per cell	2.5 × 103 81	Per cell
Sext	External 1,2-PD concentration	5.5 × 104 42	μM
Aout	External propionaldehyde concentration	042	μM