Abstract
Lipid membranes are essential cellular elements as they provide cellular integrity and selective permeability under a broad range of environmental settings upon cell growth. In particular, Archaea are commonly recognized for their tolerance to extreme conditions, which is now widely accepted to stem from the unique structure of their lipids. While enhancing the stability of the archaeal cell membrane, the exceptional properties of archaeal lipids also hinder their extraction using regular procedures initially developed for bacterial and eukaryotic lipids. The protocol described here circumvents these issues by directly hydrolyzing the polar head group(s) of archaeal lipids and extracting the resulting core lipids. Although leading to a loss of information on the nature of polar heads, this procedure allows the quantitative extraction of core lipids for most types of archaeal cells in an efficient, reproducible, and rapid manner.
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