PR proteins play important role during plant-pathogen interactions. Column X represents some of the PR family proteins and column Y represents their main properties.Column X Column Y A PR - 2 (i) Defensin B PR - 5 (ii) Thaumatin-like C PR - 12 (iii) Lipid transfer protein D PR - 14 (iv) β-1, 3 - glucanase
A – (iv); B – (ii); C – (i); D – (iii)
Understanding PR Proteins in Plant Defense
PR proteins, which stands for Pathogenesis-Related proteins, are a group of proteins produced by plants, particularly when they are attacked by pathogens. These proteins play a crucial role in the plant's defense system, helping to protect against various threats like fungi, bacteria, and viruses.
Different families of PR proteins exist, and each family often has specific functions or properties that contribute to the overall defense response. The question asks to match specific PR protein families listed in Column X with their corresponding properties or types listed in Column Y.
Matching PR Protein Families and Properties
Let's look at the given columns and the correct matching provided:
| Column X (PR Family) | Column Y (Property/Type) | Correct Match |
|---|---|---|
| A. PR - 2 | (i) Defensin | (iv) $\beta$-1, 3 - glucanase |
| B. PR - 5 | (ii) Thaumatin-like | (ii) Thaumatin-like |
| C. PR - 12 | (iii) Lipid transfer protein | (i) Defensin |
| D. PR - 14 | (iv) $\beta$-1, 3 - glucanase | (iii) Lipid transfer protein |
Based on the correct match provided, we can establish the following associations:
- PR-2 proteins are known to be $\beta$-1, 3 - glucanases. These enzymes can break down $\beta$-1, 3-glucans, which are major components of the cell walls of many fungi. This activity helps weaken or kill fungal pathogens.
- PR-5 proteins are classified as Thaumatin-like proteins. These proteins share structural similarities with the sweet-tasting protein thaumatin and often exhibit antifungal activity, although their exact mechanism can vary.
- PR-12 proteins belong to the Defensin family. Defensins are small, cysteine-rich proteins with antimicrobial activity. Plant defensins can target microbial membranes and disrupt their function.
- PR-14 proteins are Lipid transfer proteins (LTPs). These proteins are involved in transporting lipids and can play roles in defense by disrupting microbial membranes, contributing to cell wall structure, or signaling defense responses.
Conclusion on PR Protein Matching
Therefore, the correct matching based on the properties of these PR protein families is:
- PR-2 matches with $\beta$-1, 3 - glucanase (iv)
- PR-5 matches with Thaumatin-like (ii)
- PR-12 matches with Defensin (i)
- PR-14 matches with Lipid transfer protein (iii)
This corresponds to the option: A – (iv); B – (ii); C – (i); D – (iii).
Important Questions from Host parasite interaction
In what respect does the genome of slow-acting retroviruses differ from those of transducing viruses?
Listeria is a food-borne pathogen that causes mild gastro-intestinal symptoms. To move from one host-cell to another, it polymerizes actin into a comet tail like structure. Listeria can assemble host-cell actin at its rear end because:
A. Listeria has on its surface a protein called ActA
B. Listeria can activate Arp 2/3 complex
C. Listeria has on its surface γ-tubulin
D. Listeria has on its surface myosin II motor
Which one of the following options represents all correct statements?
Which one of the following plant pathogens has largest genome size?
Pathogens continuously evolve strategies to evade host immune responses. For each of the following evasion strategies (listed in column X) match the pathogen (listed in column Y) which adopts it:
Choose the correct matchColumn X Column Y A Changing the antigen expressed on their surface (i) Influenza virus B Increasing phagocytic activity of macrophage (ii) Neisseria C Developing resistance to
complement-mediated lysis(iii) Gram +ve
bacteriaD Secreting proteases to inactivate antibodies (iv) No bacteria
E Allowing point mutations in
surface epitopes resulting in
antigenic driftWhich of the following phytopathogens has predominantly necrotrophic mode of colonization?
