Myoglobin-like aerotaxis transducers in Archaea and Bacteria

Shaobin Hou, Randy W. Larsen, Dmitri Boudko, Charles W. Riley, Ece Karatan, Mike Zimmer, George W. Ordal and Maqsudul Alam ()
Additional contact information
Shaobin Hou: Snyder Hall 207
Randy W. Larsen: Department of Chemistry
Dmitri Boudko: Snyder Hall 207
Charles W. Riley: Snyder Hall 207
Ece Karatan: University of Illinois
Mike Zimmer: University of Illinois
George W. Ordal: University of Illinois
Maqsudul Alam: Snyder Hall 207

Nature, 2000, vol. 403, issue 6769, 540-544

Abstract: Abstract Haem-containing proteins such as haemoglobin and myoglobin play an essential role in oxygen transport and storage. Comparison of the amino-acid sequences of globins from Bacteria and Eukarya suggests that they share an early common ancestor, even though the proteins perform different functions in these two kingdoms1,2,3,4,5,6. Until now, no members of the globin family have been found in the third kingdom, Archaea. Recent studies of biological signalling in the Bacteria and Eukarya have revealed a new class of haem-containing proteins that serve as sensors7. Until now, no haem-based sensor has been described in the Archaea. Here we report the first myoglobin-like, haem-containing protein in the Archaea, and the first haem-based aerotactic transducer in the Bacteria (termed HemAT-Hs for the archaeon Halobacterium salinarum, and HemAT-Bs for Bacillus subtilis). These proteins exhibit spectral properties similar to those of myoglobin and trigger aerotactic responses.

Date: 2000
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DOI: 10.1038/35000570

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