1. Researchers have recently discovered that the white rot fungus Pleurotus prod
ID: 213917 • Letter: 1
Question
1. Researchers have recently discovered that the white rot fungus Pleurotus produces two isoenzymes of manganese-oxidizing peroxidase. This enzyme is used to selectively remove lignin from grass. Why is the paper industry investigating the control mechanisms of each isoenzyme?
2. In plants, one isoenzyme of fructose 1,6-diphosphate is found in the cytosol and another isoenzyme is found in the chloroplast stroma. The enzyme catalyze the formation of sucrose from triose phosphate in the cytosol and starch from triose phosphate in the stroma. The cytosolic enzyme is active in the presence of high triose phosphate and the stromal enzyme is activated by light. Propose a reason for the two different methods of activation.
Explanation / Answer
1. Answer:- paper industry investigating the control mechanisms of each isoenzymes because these isoenzymes remove lignin from plants, which is an important part for paper industry.
2.
The pathway of CO2 assimilation is under strict regulatory control and the key enzymes of the pathway, besides being regulated by metabolites are also subjected to regulation by light.
Carbon in the form of dihydroxy acetone phosphate (DHAP) leaves chloroplasts through phosphate translocator and is converted to sucrose in the cytosol.
The major regulatory enzymes in sucrose biosynthetic pathway include cytosolic fructose-1,6-bisphosphatase (FBPase) and sucrose phosphate synthase (SPS), both of which catalyze irreversible reactions and have tight allosteric regulation by cytosolic metabolites and intermediates in vivo.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.