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Microbial Biotechnology
Products from Microorganisms
LECTURE 12:
Biotechnology; 3 Credit hours
Atta-ur-Rahman School of Applied Biosciences (ASAB)
National University of Sciences and Technology (NUST)
Products from Microorganisms
• A number of commercially important compounds are produced from microorganism by biotechnology. That includes;
• Metabolites• Enzymes• Antibiotics• Natural Rubber• Fuels• Plastics
1. Metabolites
• Two types of metabolites are produced by microbial cell1. Primary metabolite2. Secondary metabolite
Primary metabolite• They are produced during the organism growth
phase. • These compound are essential to an organism
metabolism and can be intermediate metabolite or end products
Metabolites Cont.'s
Secondary Metabolites• They are derived from primary metabolites or the
intermediates of primary metabolites• They are characteristically produced quite late in
the growth cycle• They are not essential for the cell growth or
function• Their specific functions are unknown, these
compound probably give the organism selective advantage against its competitors in its natural environment
Primary Metabolites Secondary Metabolites
Amino Acids Antibiotics
Vitamins Pigments
Nucleotides Toxins
Polysaccharides Alkaloids
Ethanol Many active pharmacological compounds
Acetone Immuno suppressor cyclosporins etc.
Butanol
Lactic Acid
Metabolites Cont.'s
2. Enzymes
• Enzymes isolated from microorganism and fungi have applications in the production of food, cosmetics, pharmaceuticals, industrial chemicals and detergents
• High fructose corn syrup by Bacillus amyloliquefaciens for β-amylase, Aspergillus niger for glucoamylase and Arthrobacter sp. For glucose isomerase
Enzymes Cont.’sEnzymes Uses
Lipases Enhance flavor in cheese making
Lactase Breaks down lactose to glucose and galactose; lactose free milk products
Protease Detergent additive; hydrolase suspended proteins in beer that form during brewing for a less cloudy chilled beer
α-amylase Used in production of high fructose corn syrup
Pectinase Degrades pectin to soluble components, reduce cloudiness in chilled wine, fruit juice
Tissue plasminogen activator (TPA) Dissolves blood clots
• Recombinant DNA technology provides way to mass produce industrially important enzymes
• How???• The search for new microorganism and
enzymes is going on• Less than 1% of the world’s microorganism
have been cultured and characterized• Hence they represent an untapped gold mine
Enzymes Cont.’s
• Microbes have adapted to practically every habitat, they have evolved complex biochemical pathways
• Scientist are discovering new enzymes from microorganism, extremophiles, as well as those found in wastewater that may be applicable to a variety of industrial processes
• Once enzyme and its application identified, it can be improved for enhanced catalytic properties, modified substrate recognition through genetic engineering
Enzymes Cont.’s
• Antibiotics are small metabolites with antimicrobial activity; produced by Gram +ve, G–ve and fungi
• Their role in nature is to enable the antibiotic producer to effectively compete for resources in the environment by killing or inhibiting the growth of competitor microorganism
3. Antibiotics
Antibiotics Cont.’s
• First antibiotic used was penicillin, discovered in 1929 by Alexder Fleming
• Antimicrobial drugs act is different ways by• Disrupting the plasma membrane• Inhibiting cell wall synthesis• Inhibiting protein synthesis; translation• Inhibiting nucleic acid synthesis and replication• Inhibiting synthesis of important metabolites;
folic acid etc.
Antibiotics Cont.’s