Besides coding for a series of namesake rhodopsins and halorhodopisin, their cell walls consist of beta-1,3-linkages containing N-acetyltalosaminuronic acid and N-acetylglucosamine.
Baker and Barfield recently discovered a new group of these organisms in the Iron Mountain Mine, a group they've dubbed ARMAN. One class of these organisms has a chloride channel that opens in response to light; that gene NpHR, is a component of "off" signals in optogenetics. Besides coding for a series of namesake rhodopsins and halorhodopisin, their cell walls consist of beta-1,3-linkages containing N-acetyltalosaminuronic acid and N-acetylglucosamine. One subgroup of them uses coenzyme M and methanofuran. Their membranes have unusual double-headed, highly branched lipids, which contain ether linkages. They were originally delineated in a phylogenetic study of ribosomal RNA by Carl Woese. Including methanogens, halophiles, and thermophiles, for 10 points, name this domain apart from bacteria and eukaryotes, which live in extreme environments.
Baker and Barfield recently discovered a new group of these organisms in the Iron Mountain Mine, a group they've dubbed ARMAN.
Archaebacteria