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TORTORA • FUNKE
• CASE
Microbiology
AN INTRODUCTION
EIGHTH EDITION
B.E Pruitt & Jane J. Stein
Chapter 11, part A
The Prokaryotes:
Domains Bacteria and Archaea
PowerPoint® Lecture Slide Presentation prepared by Christine L. Case
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
The Prokaryotes:
Domains Bacteria and Archaea
• One circular chromosome, not in a membrane
• No histones
• No organelles
• Peptidoglycan cell walls
• Binary fission
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
Domain Bacteria
• Proteobacteria
• Mythical
Greek god,
Proteus, who
could
assume
many shapes
• Gramnegative
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
The  (alpha) Proteobacteria
• Human pathogens:
• Bartonella
• B. hensela
Cat-scratch disease
• Brucella
Brucellosis
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
The  (alpha) Proteobacteria
• Obligate intracellular parasites:
• Ehrlichia. Tick-borne, ehrlichiosis
• Rickettsia. Arthropod-borne, spotted fevers
• R. prowazekii
Epidemic typhus
• R. typhi
Endemic murine typhus
• R. rickettsii
Rocky Mountain Spotted Fever
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
The  (alpha) Proteobacteria
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
Figure 11.1
The  (alpha) Proteobacteria
• Wolbachia. Live
in insects and
other animals
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
The  (alpha) Proteobacteria
• Have prosthecae:
• Caulobacter. Stalked
bacteria found in lakes
• Hyphomicrobium.
Budding bacteria found
in lakes
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
Figure 11.2 & 3
The  (alpha) Proteobacteria
• Plant pathogen:
• Agrobacterium.
Insert a plasmid
into plant cells,
inducing a
tumor
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
Figure 9.17
The  (alpha) Proteobacteria
• Chemoautotrophic:
• Oxidize nitrogen for energy
• Fix CO2
• Nitrobacter. NH3+  NO2–
• Nitrosomonas. NO2–  NO3–
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
The  (alpha) Proteobacteria
• Nitrogen-fixing
bacteria:
• Azospirillum
• Grow in soil,
using nutrients
excreted by
plants
• Fix nitrogen
• Rhizobium
• Fix nitrogen in the
roots of plants
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings
Figure 27.5
The  (alpha) Proteobacteria
• Produce acetic acid from ethyl alcohol:
• Acetobacter
• Gluconobacter
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings