Oftentimes, the major challenge in the determination of protein structure via X-ray crystallography is the production of good crystals. One common approach is to crystallize fragments of the whole protein instead of crystallizing the whole protein. If you were to cleave a protein into fragments that will still retain the folding of that fragment in the whole protein, where is the best location to perform the cleavage? O At the ends of each alpha helix. O At the ends of a protein motif. O At the points connecting protein domains. O At the ends of beta strands.

Oftentimes, the major challenge in the determination of protein structure via X-ray crystallography is the production of good crystals. One common approach is to crystallize fragments of the whole protein instead of crystallizing the whole protein. If you were to cleave a protein into fragments that will still retain the folding of that fragment in the whole protein, where is the best location to perform the cleavage? O At the ends of each alpha helix. O At the ends of a protein motif. O At the points connecting protein domains. O At the ends of beta strands.

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter3: The Chemistry Of Life: Organic Compounds

Section: Chapter Questions

Problem 9TYU: Which of the following levels of protein structure may be affected by hydrogen bonding? (a) primary...

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Our growing understanding of how proteins fold allows researchers to make predictions about protein structure based on primary amino acid sequence data. Consider the following amino acid sequence.(a) Where might bends or β turns occur?(b) Where might intrachain disulfide cross-linkages be formed?(c) Assuming that this sequence is part of a larger globular protein, indicate the probable location (external surface or interior of the protein) of the following amino acid residues: Asp, Ile, Thr, Ala, Gln, Lys. Explain your reasoning.
Our understanding of how proteins fold allows us to make predictions about protein structure based on primary amino acid sequence data. Consider the following amino acid sequence :a)Where might bends or βturns occur? b)Where might intrachain disulphide cross-linkages be formed? c)Assuming that this sequence is part of a bigger globular protein, indicate the probable location (on the surface or interior of the protein) of the following amino acid residues: Asp, Ile, Thr, Ala, Gln and Lys. Explain your reasoning
Why is the 3-Dimensional structure important for protein function? What factors or agents can denature protein structure? Give examples (more than one factor) Why denaturation affect the function of proteins? Explain the structure - function relationship.
Identify the following statements as descriptive of the secondary, tertiary, or quaternary structure of a protein. What types of interactions stabilize each type of structure?(a) The polypeptide chain has a number of bends and twists, resulting in a compact structure.(b) The polypeptide backbone forms a right-handed coil.(c) The four polypeptide chains are arranged in a spherical shape.
Which of the following statements about alpha-helix and beta-sheet structure are true? More than one answer is correct. -they are aspects of protein secondary structure. -they are maintained by hydrogen-bonding interactions within the polypeptide backbone. -most proteins fall into one of two categories: those composed entirely of alpha-helix, and those composed entirely of beta-sheet. -in both alpha-helix and beta-sheet, each amino acid (at position n) interacts with another amino acid at position n+4. -alpha-helix contains only hydrophobic amino acids, while beta-sheet contains only hydrophilic amino acids. More than one answer is correct I am confused
Which of the following characterize -helix regions of proteins? (A) They all have the same primary structure. (B) They are formed principally by hydrogen bonds between a carbonyl oxygen atom in one peptide bond and the amide hydrogen from a different peptide bond. (C) They are formed principally by hydrogen bonds between a carbonyl atom in one peptide bond and the hydrogen atoms on the side chain of another amino acid. (D) They are formed by hydrogen bonding between two adjacent amino acids in the primary sequence. (E) They require a high content of proline and glycine
A protein in its native three dimensional conformation is cleaved with trypsin. According to the amino acid sequence, there are 9 residues where trypsin could cleave, yet only 3 fragments were produced from the digest. What conclusion can be made about protein structure that would lead to this result? The protein has multiple domains b. The protein is highly compacted, minimally accessible by solvent molecules c. The protein has quaternary structure d. The protein has a dynamic structure, highly accessible by solvent molecules e. The protein is compromised only of alpha helices
Protein folding is critical for function because the properties of a protein arise from its overall shape and the distribution within that shape of the various amino acid side-chains. Which of the following statements about protein three-dimensional structure are correct? 1) the folding pattern of a protein is ultimately determined by its amino acid sequence. 2) proteins tend to fold in such a way that the hydrophobic amino acids are buried in the interior, while hydrophilic amino acids are exposed at the surface. 3) the chemical interactions within a protein molecule that support its overall folded structure are mostly covalent C-C (carbon to carbon) bonds between amino acid side-chains. 4) the overall folding pattern/shape of a protein molecule is termed its primary structure. 5) during evolution, the three-dimensional structure of a protein is often more strongly conserved than its amino acid sequence. More than one answer might be right
Consider the following in light of the concept of levels of structure (primary, secondary, tertiary, quaternary) as defined for proteins. (a) What level is shown by doublestranded DNA? (b) What level is shown by tRNA? (c) What level is shown by mRNA?
Our growing understanding of how proteins fold allows researchers to make predictions about protein structure based on primary amino acid sequence data Consider the following amino acid sequence Ile-Ala-His-Thr-Tyr-Gly-Pro-Phe-Glu-Ala-Ala-Met-Cys-Lys-Trp-Glu-Ala-Gln-Pro-Asp-Gly-Met-Glu-Cys-Ala-Phe-His-Arg Where might reverse turns occur? Where might Intrachain disulfide linkages be formed? What will be the secondary structure formed from this sequence? Assuming that this sequence is part of a larger globular protein, indicate the probable location of the following amino acid residues: Asp, Ile, Thr, Ala. Gln, Lys.( Hint: see Hydropathy index)
You have a soluble protein that is highly flexible and is only 23 kDa in size. What is the most suitable technique (X-ray crystallography, NMR, cryo-EM) for structure determination of this protein? Explain your reasoning.
In the illustration below, the blue squiggly line represents a protein. Notice that the amino acid that is colored red and the amino acid that is colored black are very close to each other in space, but they are far from each other in the primary structure of this protein. How can you explain why two amino acids that are so far from each other in the primary structure of a protein can be so close together in the tertiary structure of the same protein?