TABLE 4.
Properties of cytochromes from thermoacidophilic aerobic archaeaa
| Cytochrome type and source | Molecular mass (kDa) | Gene(s) | Cofactor(s) | E0 (mV) | Function(s) | Reference(s) |
|---|---|---|---|---|---|---|
| b558/566, S. acidocaldarius (DSM 639) | 66 (PAGE) | cbsA, cbsB | 1 heme B | >300 | Highly glycosylated; unknown function; exposed to periplasm | 45, 220 |
| 55 (deglyc.) | ||||||
| 50.5 (DNA) | ||||||
| b562, S. acidocaldarius (DSM 639) | 45 (PAGE) | soxM | 1 heme B | ND | Alternate terminal ba3 oxidase complex | 327, 328 |
| 87.1 (DNA) | 1 heme As | |||||
| 1 Cu | ||||||
| b563, Sulfolobus sp. strain 7 | 37 (PAGE) | NA | 1 heme B | 146 | Component of respiratory complex | 246, 247 |
| a587 I, S. acidocaldarius (DSM 639) | 39/64b (PAGE) | soxC | 2 heme AS | 210 | Component of terminal oxidase SoxABCD | 92, 173, 175 |
| 62.8 (DNA) | 270 | |||||
| a587 II, S. acidocaldarius (DSM 639) | 37 (PAGE) | soxG | 2 heme AS | 20 | Component of SoxM alternative heme-Cu oxidase | 92, 327 |
| 56.7 (DNA) | 100 | |||||
| a583, Sulfolobus sp. strain 7 | Unknown | NA | 1 heme AS | 270 | Terminal oxidase complex; cyt c function assumed | 246,247, 250 |
| aa3, S. acidocaldarius (DSM 639) | 38 (PAGE) | soxB | 2 heme AS | 220 | Subunit I of heme-Cu quinol oxidase SoxABCD | 22, 23, 329 |
| 57.9 (DNA) | 1 Cu | 365 | ||||
| aa3, Sulfolobus sp. strain 7 | 40 (PAGE) | NA | 2 heme AS | 117 | Putative subunit I of terminal oxidase complex (c oxidase activity) | 247 |
| 1 Cu | 325 | |||||
| aa3, A. ambivalens | 40 (PAGE) | doxB | 2 heme AS | 235 | Subunit I of terminal quinol oxidase | 24 |
| 65 (DNA) | 1 Cu | 330 | ||||
| b562/aa3, S. solfataricus (DSM 1616) | ND | NA | Heme B | ND | Unresolved components; CO-reactive respiratory complex | 594 |
| ND | Heme AS | |||||
| b558/562, T. acidophilum | 18 (PAGE) | Orf-2 | 2 heme B | 75 | cyt b of putative fumarate dehydrogenase | 162 |
| −150 |
a
Abbreviations: deglyc., deglycosylated protein; AS, A-type heme as described for Fig. 14; NA, no genetic data available; ND, not determined; PAGE, Mr determined by PAGE; DNA, molecular mass derived from gene sequence. Further details may be extracted from the references given.
b
Molecular mass determined by PAGE in presence of 1% i-butanol.