Extremophiles: The Toast of the
Industry
Archaebacteria
live in extreme environments and, therefore, are sometimes called
extremophiles. The three groups of archaebac-teria-methanogens, halophiles, and
thermacidophiles-have specific preferences about the precise nature of their
environ-ment. Methanogens are strict
anaerobes that produce methane (CH4) from
carbon dioxide (CO2) and hydrogen (H2).
Halophiles require very high salt
concentrations, such as thosefound in the Dead Sea, for growth. Thermacidophiles require high
temperatures and acid conditions for growth-typically, 80°C– 90°C and pH 2.
These growth requirements may have resulted from adaptations to harsh
conditions on the early Earth. Since these organisms can tolerate these
conditions, the enzymes they produce must also be stable. Most enzymes isolated
from eubacte-ria and eukaryotes are not stable under such conditions. Some of
the reactions that are of greatest importance to the biotechnology industry are
both enzyme-catalyzed and carried out under condi-tions that cause most enzymes
to lose their catalytic ability in a short time. This difficulty can be avoided
by using enzymes from extremophiles. An example is the DNA polymerase from Thermusaquaticus (Taq polymerase).
Polymerase chain reaction (PCR)technology depends heavily on the properties of
this enzyme. Representatives of the biotechnology industry constantly search
undersea thermal vents and hot springs for organisms that can provide such
enzymes.
Related Topics
Privacy Policy, Terms and Conditions, DMCA Policy and Compliant
Copyright © 2018-2024 BrainKart.com; All Rights Reserved. Developed by Therithal info, Chennai.