Pyrobaculum islandicum

Very recently a new type of 7Fe Fd (Mr 12,000) has been purified from the hyperthermophilic archaeon Pyrobaculum islandicum 122). The protein has a C-terminal extension, as in A. vinelandii Fdl, but the overall sequence homology between these two Fds is low, and the... 

Kashefi K, DR Lovley (2000) Reduction of Fe(lll), Mn(lV), and toxic metals and 100°C by Pyrobaculum islandicum. Appl Environ Microbiol 66 1050-1056. 

Molitor, M., Dahl, C., Molitor, I. 5 others 1998. A dissimilatory siro-haem-sulfite-reductase-type protein from the hyperthermophile archaeon. Pyrobaculum islandicum. Microbiology, 144, 529-541. 

Around the hydrothermal vents in the deep sea, extremely thermophilic bacteria reside which have the optimal growth temperature at 100°C which participate in the reduction of several metals. For example, Pyrobaculum islandicum (Kashefi... 

The formation of methane by the methanogens is called carbon dioxide respiration, as described previously (p. 112). In general, cytochromes occur as the electron carrier in the respiration. Thus, some methanogens have cytochromes b and c. However, not all methanogens have cytochromes, as already mentioned. This may mean that carbon dioxide respiration is an early evolving stage of the respiration from the noncytochrome-type to the cytochrome-type. The electron transfer systems of the sulfur respirers contain cytochrome b or cytochromes b and c (Hedderich et al., 1999). In the iron respiration system of Pyrobaculum islandicum, cytochrome b seems to participate in the Fe(III) reducing system (Childers and Lovley, 2001). These results will show that the fundamental features of the respiration may have already been established in the hyperthermophilic chemolithoautotrophic archaea (Fig. 7.2). 

Childers SE, Lovley DR (2001) Differences in Fe(III) reduction in the hyperthermophilic archaeon, Pyrobaculum islandicum, versus mesophilic Fe(III)-redudng bacteria. FEMS Microbiol Lett 195 253-258... 

M.W. Bhuiya, H. Sakuraba, T. Ohshima, T. Imagawa, N. Katunuma, H. Tsuge, The first crystal structure of hyperthermostable NAD-dependent glutamate dehydrogenase from Pyrobaculum islandicum, ]. Mol. Biol. 345 (2) (2005) 325-337. 

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