Table 4.
Constraints of VOC degradation caused by competition for degrading enzymes.
| Microorganism | Degrading enzyme | VOCs causing competitive inhibition | Reference |
|---|---|---|---|
| Methylocystis sp. SB2 | pMMO | TCE, cis-DCE, and VC | (73) |
| Methylosinus trichosporium OB3b | sMMO | TCE and trans-DCE | (11) |
| cis-DCE and trans-DCE | |||
| Pseudomonas mendocina KR1 | toluene monooxygenase | TCE and CF*1 | (119) |
| Pseudomonas putida F1 | toluene dioxygenase | benzene and toluene | (209) |
| toluene and p-xylene | |||
| Pseudomonas sp. CFS-215 | toluene dioxygenase | benzene and toluene | (6) |
| Pseudomonas sp. ENVBF1 | toluene monooxygenase | TCE and CF*1 | (119) |
| Pseudomonas sp. OX1 | TouA | TCE and CF*2 | (162) |
| Methanotrophic microcosm | methane monooxygenase | TCE and CF | (7) |
*1
The co-existence of TCE inhibited the degradation of CF, while TCE degradation was not affected. Abbreviations of VOCs indicate the following: TCE, trichloroethene; DCE, dichloroethene; VC, vinyl chloride; CF, chloroform. Abbreviations of degrading enzymes denote the following: pMMO, particulate methane monooxygenase; sMMO, soluble methane monooxygenase; TouA, toluene/o-xylene monooxygenase; MMO, methane monooxygenase.
*2
The TCE degradation rate decreased from 82% to 57% because of the co-existence of CF, while CF degradation did not change.