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Lecture 16

MICB 201 Lecture Notes - Lecture 16: Mhc Class I Polypeptide-Related Sequence B, Proteobacteria, GlycolysisPremium

3 pages32 viewsWinter 2017

Department
Microbiology
Course Code
MICB 201
Professor
Wade Bingle
Lecture
16

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Chapter 9: The Heterotrophic Way of Life
9.1 Definition and distribution
Heterotroph
An anabolic term
Strict definition: An organism that uses an organic nutrient as a source of carbon
Most also use organic nutrients as sources of energy and electrons
Reminder: in MICB 201, a heterotroph = an organism that uses an organic nutrient as
sources of Carbon, Energy, Electrons
Widely distributed in nature
Almost all of LPSN phyla have heterotrophic members
9.2 Energy, electron and C-sources
Glucose and Glycolysis
Many heterotrophic prokaryotes have NO use for glucose as an organic nutrient.
Not all prokaryotes that can use glucose metabolize it using the set of E-catalyzed
reactions called Glycolysis
The heterotrophic prokaryotic world is much more metabolically diverse than the
heterotrophic eukaryotic world
Specialized and versatile heterotrophs
Evolution has produced heterotrophs which range from specialized to versatile
Obviously relative terms
Very specialized: Restricted to the use of a few chemically related organic nutrients
as energy, electron and C-sources.
Very versatile: Use a wide variety of organic nutrients as energy, electron and C-
sources.
Versatility is more common than specialization in the heterotrophic prokaryotic
world that we know now
Example of specialized heterotrophs: methylotrophs
Most are Proteobacteria
Only use 1-C molecules for energy, electrons and C
Includes methane (greenhouse gas)
Consider the use of methane for energy production by some aerobic methylotrophs
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