Statins: Blood Cholesterol Lowering Agent from Monascus purpureus
Biology · Microbes in Human Welfare · NEET
Statins are bioactive molecules produced by the yeast Monascus purpureus, and they are sold as blood-cholesterol lowering agents. They work by competitively inhibiting the enzyme that makes cholesterol in our body. Memory hook: "STATin STAtes your cholesterol STAtic (stays low) — made by MONAScus (think MONey saved on heart bills)."
Monascus purpureus (a yeast) makes statins, which are sold as blood-cholesterol lowering agents. Statins work by competitively inhibiting the enzyme that synthesises cholesterol.
Your doubts, answered
Which microbe produces statins?
Statins are produced by Monascus purpureus. NCERT calls it a yeast. This exact pairing (Statins - Monascus purpureus) is asked again and again in NEET, so memorise it as one unit.
What do statins do?
Statins are commercialised as blood-cholesterol lowering agents. A person with high blood cholesterol takes statins as medicine so that the body makes less cholesterol. This lowers the risk of heart problems.
How exactly do statins lower cholesterol?
Statins act by competitively inhibiting the enzyme responsible for the synthesis of cholesterol. In simple words: the enzyme that builds cholesterol gets blocked, so less cholesterol is made. The word 'competitively' means the statin competes with the normal substrate for the enzyme's active site.
Is Monascus purpureus a yeast or a fungus?
NCERT clearly writes 'Statins produced by the yeast Monascus purpureus'. For NEET, follow NCERT and write yeast. (In real biology it is a mould/fungus, but the exam answer is the NCERT wording.)
How is statin different from cyclosporin A?
Both are bioactive molecules from fungi, but their jobs are opposite in the exam. Statin (from Monascus purpureus) lowers blood cholesterol. Cyclosporin A (from Trichoderma polysporum) is an immunosuppressive agent used in organ transplant patients. Students mix these two, so learn them together.
⚠️ The NEET trap ✗ Statins are produced by Trichoderma polysporum / statins are a clot buster. ✓ Statins are produced by Monascus purpureus and are blood-cholesterol lowering agents. Trichoderma polysporum gives cyclosporin A; the clot buster is streptokinase from Streptococcus. 🧠 Three fungal/bacterial products get swapped in matching questions: Statin (Monascus, cholesterol down), Cyclosporin A (Trichoderma, immunosuppressant), Streptokinase (Streptococcus, clot buster). Fix all three as a set.
Real NEET questions
NEET 2019
Which of the following is a commercial blood cholesterol lowering agent?
A · Cyclosporin A
B · Statin ✓
C · Streptokinase
D · Lipases
Solution: Statins, produced by the yeast Monascus purpureus, are commercialised as blood-cholesterol lowering agents. They act by competitively inhibiting the enzyme responsible for cholesterol synthesis. Cyclosporin A is an immunosuppressant, streptokinase is a clot buster, and lipases are detergent enzymes.
NEET 2020
Match the following columns and select the correct option:
Column-I: (a) Clostridium butylicum (b) Trichoderma polysporum (c) Monascus purpureus (d) Aspergillus niger
Column-II: (i) Cyclosporin-A (ii) Butyric acid (iii) Citric acid (iv) Statins
Which of the following is wrongly matched in the given table (Microbe - Product - Application)?
A · Trichoderma polysporum - Cyclosporin A - Immunosuppressive drug
B · Monascus purpureus - Statins - Lowering of blood cholesterol
C · Streptococcus - Streptokinase - Removal of clot from blood vessel
D · Clostridium butylicum - Lipase - Removal of oil stains ✓
Solution: The wrong row is Clostridium butylicum - Lipase. Clostridium butylicum makes butyric acid, not lipase. The other three rows, including Monascus purpureus - Statins - lowering of blood cholesterol, are all correct.
Solved Microbes in Human Welfare NEET PYQs
Try the real previous-year questions from this chapter — each with the answer and a full solution.
Statins are obtained from the yeast Monascus purpureus (NCERT wording).
What is the function of statins?
They are used as blood-cholesterol lowering agents. They reduce the amount of cholesterol the body makes.
What is the mechanism of action of statins?
Statins competitively inhibit the enzyme responsible for the synthesis of cholesterol, so less cholesterol is produced.
Is statin an antibiotic?
No. A statin is a bioactive molecule used as medicine to lower cholesterol. Antibiotics like penicillin kill or stop microbes; statins do not.
Why is the statin fact important for NEET?
It is a very high-frequency matching fact. Statin-Monascus purpureus appears almost every year in microbe-product matching and single-line questions, so it is easy, guaranteed marks if memorised.
