Fungi-The Rotten World About Us
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What are the Fungi?
• Simple eukaryotic organisms with small genomes• Reproduce asexually and sexually by spores• Heterotrophs: similar to animals, many bacteria, they rely on
autotrophic organisms for fixed carbon and nitrogen• Filamentous growth (threadlike strands called hyphae), often
branching. Growth of hyphae is at tips. Exception: yeasts which are unicellular. Fungi don't have stems, leaves, roots nor a vascular system like plants.
• Easy to grow in the lab on defined media (like bacteria), make mutants and do genetic crosses
• Many species are well developed for molecular manipulations: Transformation, gene replacement, regulated gene expression
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Fungi in the News
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Where do Fungi Fit in Classification Schemes?
Fungi are NOT Plants!!
Fungi are major players in Biotechnology
Many Spores are Produced
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How Big are They?
What Are Fungi Doing?
• Decomposers– Saprobes are the primary agents for
biodegradation of plants and woody debris• ~85 billion tons of carbon as CO2 are returned to
the atmosphere annually
– Disease Agents: decay of living material • Plant pathogens destroy ~3 billion dollars of crops
annually in N. America
– Animal pathogens • in Arizona alone, the Valley Fever fungus is
responsible for $29 million in hospital costs annually
Fungi grow everywhere
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But Fungi are not human
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Chicago Worlds Fair - Human hair growing on Wood, Believe it Or Not
Fungi in History- First observation
• Rusts were observed by Romans on cereals– ~370 BC– they created a rust God,
Robigo to pray for deliverance from disease
More History-why the British drink tea instead of coffee
• Until 1870’s, Coffee was produced in Ceylon (Sri Lanka)
• Britian was full of Coffee houses• Coffee rust (Hemileia vastatrix) swept
through the coffee plantations between1869-1900
• Coffee growers switched to tea and rubber• Coffee production moved to Central and
South America
Fungi in History- the Irish move to America
• mid-1840’s Potato crops fail in Ireland• 2 million people died, 1 million emigrated to US• 1861 deBary shows this was due to a “fungus”, Phytophthora
infestans
• an emerging problem today due to a new strain
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Fungi in History-Salem Witch Trials
• In 1692 several women in Salem, MA were accused of witchcraft and hung
• Evidence suggests their “strange behavior” may have been due to poisoning by the ergot fungus, Claviceps purpurea, a pathogen of rye
– This fungus produces toxins (alkaloids) that cause vasoconstriction.• It is the source of LSD• Can lead to cutting off of the blood supply and loss of limbs due to gangrene setting in• Some of its alkaloids are used for treatment of migranes, and induction of labor during
childbirth
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Fungi- The New Asbestos?
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New York TimesMagazine -
August 12, 2001
Stachybotrys chartarum
The sick building mold??????
Why are fungi important organisms for biotechnology?
• Produce 1o and 2o metabolites of industrial importance• 1o metabolites: end products of common metabolic pathways:
alcohol (ethanol), citric acid, itaconic acid• 2o metabolites: a diverse range of compounds that lack known
obvious functions in the growth and reproduction of the organism.
Production often occurs after growth has stopped, when nutrients are limited, but excess carbon is available.ex: Penicillin, cephalosporins, griseofulvin, cyclosporin, ergot alkaloids
• Well developed and understood secretory machinery allowing simple purification of products from culture medium.
• Relatively easily grown in mass culture and lots of practice (alcoholic beverage industry).
Manipulability of Fungi makes them attractive to industry
• Easy to grow, make mutants and do genetic crosses• Molecular biology is well developed: transformation, gene
replacement, regulated expression, total genome expression analysis, whole genome sequences are becoming available
• Saccharomyces cerevisiae was the first eukaryote to have its full genome sequenced (1996), Neurospora crassa (2001), several others in 2002
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Saccharomyces cerevisiae: the brewers and bakers yeast
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A facultative anaerobe
Anaerobic respiration: produces alcoholC6H12O6 --------------> 2C2H5OH + 2CO2 + 2 ATP
Aerobic respiration: major product is CO2 C6H12O6 --------------> 6 CO2 + 6 H2 + 38 ATP
•One of the first organism’s exploited for biotechnology•Wheat production resulted in the settling of populations•Yeast was responsible for making bread rise
Fungi were the source of the first antibiotic
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Penicillium notatum
The Penicillin Story
• Antibiotic production
– 1929: Discovered P. notatum as a contaminant on a bacterial plate by A. Fleming
– 1939: Chain and Florey first isolated drug to treat mice and a dying patient
– 1940’s: Florey and others worked on production for treatment of bacterial infections during WWII
– Production Improvements:• New species ID’ed: P. chrysogenum on a moldy cantelope in a Peoria, IL
market
• Culturing conditions: corn steeping liquor gave a 40X yield increase
• Mutagenesis and selection increased production from 80 mg/L to 7 g/L
• Synthetic modification of side chains produced more stable and effective drugs (ampicillin, carbenicillin)
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Penicillin- the first antibiotic
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Fleming’s 1929 plate
Quorn- eaten in the UK for 17 years, now available in the US
• Fusarium graminearum, isolated from a field in Marlow, Buckinghamshire
• Quorn is produced from mycelia grown in 155,000 litre airlift fermenters
• The filamentous nature of the biomass is responsible for the meat-like texture and appearance of the final product.
• Probably the most thoroughly tested food ever to appear on supermarket shelves, annual sales of Quorn are now in excess of £15 million in the UK.
“Quorn”-meat-free
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www.quorn.com
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Quorn products typically contain between 11 to 15 grams of protein per 100 grams, most of which comes from mycoprotein.
Citric acid isolated, from a fungus, is everywhere
• Citric acid production is from the fungus Aspergillus niger• Production is due to blockage of the TCA cycle by growing A.
niger under low pH conditions with enzyme inhibitors like Cu ions
• 1979, more than 100 million kilograms were produced in US and Europe
• Found as a flavoring (soft drinks, candies, desserts, jams jellies, wines, frozen fruits, also in gelatins
• citrates in blood transfusions act as anti-coagulants• Adjusts pH in hair rinses, hair dyes, used in creams and
ointments• Zinc citrate in toothpaste is a plaque inhibitor
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Closer to Home- Valley Fever
Arthroconidia (transmission & scanning EM)
Infectious PhaseSpherules (Freeze-fracture EM)
What Is Valley Fever?
• Caused by a soil fungus Coccidioides immitis
(Coccidium-like not mild)
• Other names:– Coccidioidomycosis
(cocci)– Desert Rheumatism
• Infection results from inhaling arthroconidia
• Severity varies– Mild: 60%
– Moderate: 30%
– Complicated: 10%
• After infection, most persons develop life-long immunity
Coccidioides immitis
Valley Fever in the U.S.
50-70
30-50
10-30
5-10
<5
% Positive Skin Test
Coccidioidomycosis in Arizona (Reported)-a problem on the rise
0
600
1200
1800
2400
1990 1993 1995 1998 2001
High Profile Cases
Woods’ ills caused
by Valley Fever
By SUSAN CARROLL
Citizen Staff Writer__ ___________
Loren Wood’s lamented absence
from the NCAA Tournament, his two
back surgeries and upcoming months
of physical therapy are being blamed
on one culprit: valley fever.
TUCSON CITIZEN: May 5, 2000