Question

Which of the following are applications of proteomics
(A). Mining of the proteins in a sample
(B). Protein-expression profiling
(C). Determination of native structure of a protein
(D). Mapping of protein modification
Choose the correct answer from the options given below:

• A. (A), (B) and (C) only
• B. (B), (C) and (D) only
• C. (A), (C) and (D) only
• D. (A), (B) and (D) only

Hint:

Mass spectrometry is the central platform for high-throughput shotgun proteomics, enabling the simultaneous identification and quantification of thousands of proteins.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Proteomics is the large-scale analytical study of the structure, function, and expression of the entire set of proteins produced by an organism or cellular system.

Step 2: Detailed Explanation:
- Mining of proteins (A): Involves identifying and cataloging all proteins present in a complex biological sample.
- Protein-expression profiling (B): Measures relative changes in protein abundance across different tissues, stages, or treatment conditions.
- Mapping of protein modifications (D): Identifies post-translational modifications (PTMs), such as phosphorylation, glycosylation, and ubiquitination.
- Analytical proteomics methods (like mass spectrometry) are highly effective for identifying and quantifying proteins (A, B, and D).
- In contrast, determining the native 3D structure of a protein (C) requires specialized biophysical techniques like X-ray crystallography, NMR spectroscopy, or cryo-EM, which are classified under structural biology rather than analytical proteomics.

Step 3: Final Answer:
The primary applications of analytical proteomics are protein mining, expression profiling, and modification mapping.