Bioactive Molecules
உயிரியல் செயல்பாட்டு மூலக்கூறுகள்
Microbes are not just pathogens; they are chemical factories. If you confuse the source organism of Cyclosporin A with Statins, you lose 4 marks. Precision in microbiology is the difference between a doctor and a dropout.
The idea
Bioactive molecules are microbial products used for commercial and medical purposes. Lipases are used in detergent formulations to remove oily stains. Pectinases and proteases clarify bottled fruit juices. Streptokinase, produced by Streptococcus, acts as a 'clot buster' for myocardial infarction patients. Cyclosporin A, from Trichoderma polysporum, acts as an immunosuppressive agent in organ transplants, while Statins, from Monascus purpureus, inhibit blood cholesterol synthesis.
Why it matters
These molecules are secondary metabolites produced by microbes, which humans have harnessed for specific industrial and medical applications.
NEET lens
NEET focuses on matching the molecule with its source organism and its specific function. Memorize the table: Trichoderma (Cyclosporin A), Monascus (Statins), and Streptococcus (Streptokinase). Do not confuse the enzyme function with the medical application. Expect at least one question on this in every paper.
Clinical significance
Without Streptokinase, a coronary artery blockage leads to irreversible myocardial necrosis. Without Cyclosporin A, the host immune system would reject a transplanted organ via cell-mediated immunity. These molecules are life-saving interventions in critical care medicine.
Introduction
Microbes are used to make many bioactive molecules for industry and medicine — enzymes, organic acids, immunosuppressants and cholesterol-lowering drugs.
Core concept
Industrial products (NCERT): Organic acids — Aspergillus niger (fungus) → citric acid; Acetobacter aceti (bacterium) → acetic acid; Clostridium butylicum (bacterium) → butyric acid; Lactobacillus (bacterium) → lactic acid. Yeast Saccharomyces cerevisiae → commercial ethanol. Enzymes — lipases are used in detergent formulations to remove oily stains from laundry; pectinases and proteases make bottled fruit juices clearer. Streptokinase — produced by Streptococcus and modified by genetic engineering — is used as a 'clot buster' for removing clots from blood vessels of patients who have had myocardial infarction (heart attack). Cyclosporin A — produced by the fungus Trichoderma polysporum — is an immunosuppressive agent used in organ-transplant patients. Statins — produced by the yeast Monascus purpureus — lower blood cholesterol by competitively inhibiting the enzyme responsible for cholesterol synthesis.
Go deeper
Microbes are grown on an industrial scale in very large vessels called fermentors. Beverages: wine and beer are produced without distillation; whisky, brandy and rum are produced by distillation of the fermented broth.
From Class 10
Medicines like some heart-attack drugs and transplant drugs are made by microbes grown in big tanks in factories.