BIF401 Subjective

BIF-401 · st Excellent group of zoologist · Bioinformatics currently questions (2021) · 1. How homology modeling predict protein structure

If another protein which has a similar sequence also has its structure known, the structure of an unknown protein can be predicted based on that similar protein. So, it is then possible to identify unknown protein structures by just examining the homologous protein sequences. Good sequence alignment and identity ensures that homology modelling will give accurate results Thus, Homology modeling is used to predict structures of proteins having high sequence similarity with other proteins with known structures.

2. Goal of protein folding

Proteins have several layers of structure each of which is important in the process of protein folding. The first most basic level of this structure is the sequence of amino acids themselves. The sequencing is important because it will determine the types of interactions seen in the protein as it is folding

3. Protein folding importance

Proteins fold spontaneously. Proteins fold to achieve thermodynamic stability. Proteins fold to organize themselves for performing functions in cells. Importance of protein Folding

4. Factors affecting the protein folding

The external factors involved in protein de-naturation or disruption of the native state include temperature, external fields (electric, magnetic), molecular crowding, and even the limitation of space, which can have a big influence on the folding of proteins.

5. Advantages of protein folding

Protein folding is a process by which a polypeptide chain folds to become a biologically active protein in its native 3D structure. Protein structure is crucial to its function. Folded proteins are held together by various molecular interactions. ... The amino acid sequence of a protein determines its 3D structure

6. Optimal energy function in protein

Results: For a single protein sequence, the probability of success (i.e. the probability that the folded state is the lowest energy state) is derived. We then maximize the average probability of success for a set of proteins to obtain the optimal potential energy function

7. Protein denaturation

Denaturation of proteins involves the disruption and possible destruction of both the secondary and tertiary structures. Since denaturation reactions are not strong enough to break the peptide bonds, the primary structure (sequence of amino acids) remains the same after a denaturation process.

8. What happen when protein unfolding

Denaturation of proteins is a process of transition from the folded to the unfolded state. It happens in cooking, in burns, in proteinopathies, and in other contexts. The duration of the folding process varies dramatically depending on the protein of interest.

Q9. Prediction of Protein Structure?

Protein structure prediction is the inference of the three-dimensional structure of a protein from its amino acid sequence—that is, the prediction of its folding and its secondary and tertiary structure from its primary structure.

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Why it`s protein sequence determined difficult?

The generation and isolation of cleavage fragments from small amounts of proteins is technically challenging, mainly because unambiguous internal sequence information can only be generated from proteins of extraordinary purity and because many proteins are difficult to maintain in a solution compatible with proteolytic

11.

Best algorithm used for protein folding?

The best way to find protein folding x-rays or crystallization process

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Protein folding occurs in a cellular compartment called the endoplasmic reticulum. This is a vital cellular process because proteins must be correctly folded into specific, threedimensional shapes in order to function correctly. Unfolded or misfolded proteins contribute to the pathology of many diseases

13.

Write steps of protein sequence identification? OR Enlist protein sequence method.

Following steps involve in protein sequence identification

 Complex protein  Separation  Ionization by mass spectrometry  Fragmentation MS2  Mass spectra  EST Determination  Filter protein database  In silico fragmentation of candidate protein  Matching of experimental and insilco peak list  Post translational modification  Protein score

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Four forces include protein folding

Proteins fold into stable three‐dimensional shapes, or conformations, that are determined by their amino acid sequence. The complete structure of a protein can be described at four different levels of complexity: primary, secondary, tertiary, and quaternary structure

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Role of Global Protein

Global protein functions prediction from protein-protein interaction networks. The availability of entire genome sequences and of high-throughput capabilities to determine gene co expression patterns has shifted the research focus from the study of single proteins or small complexes to that of the entire proteome.

16.

Prediction of secondary structure

The Chou–Fasman method is an empirical technique for the prediction of secondary structures in proteins, originally developed in the 1970s by Peter Y. Chou and Gerald D. Fasman.

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What you mean by protein fragmentation?

 Electron Capture Dissociation (ECD)  Electron Transfer Dissociation (ETD)  Collision Induced Dissociated (CID)

19.

What is hydrophobicity of amino acid?

In chemistry, hydrophobicity is the physical property of a molecule that is seemingly repelled from a mass of water. In contrast, hydrophiles are attracted to water. Hydrophobic molecules tend to be nonpolar and, thus, prefer other neutral molecules and nonpolar solvents.

20.

Characteristics of amino acid and Amino acid function

Protein plays a crucial role in almost all biological processes and amino acids are the building blocks of it. A large proportion of our cells, muscles and tissue is made up of amino acids, meaning they carry out many important bodily functions, such as giving cells their structure.

Function

Protein plays a crucial role in almost all biological processes and amino acids are the building blocks of it. A large proportion of our cells, muscles and tissue is made up of amino acids, meaning they carry out many important bodily functions, such as giving cells their structure