You run an SDS-PAGE gel on some purified protein samples against a protein ladder asmarked.kDa225150100755035251) Homodimer with molecular weight of 52 kDa linked by salt-bridges and hydrogenbondsABCDE2) Heterodimer with molecular weight of 52 kDa linked by salt-bridges and hydrogenbonds3) A protein with no quaternary structure that has a molecular weight of 52 kDaBE

SDS PAGE is an electrophoretic technique, which is used to separate proteins based on their size.…

Answered: You run an SDS-PAGE gel on some…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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(a) 1 Normalized fluorescence 0.8 0.6 0.4 0.2 0 1.7.0- 50 55 OM 0.100 M 0.200 M 0.300 M 0.500 M 1.00 M 2.00 M Where is fully folded protein? • Where is fully unfolded protein? • Where is partially folded protein? 60 A 65 Temp. (°C) 70 75 80 To what does SYPRO orange bind? • Why does fluorescence increase as a function of temperature? • Define a melting temperature for a protein. • Demonstrate how an estimated melting temperature of the protein in zero molar ligand can be determined. • What is the effect of increasing the molar concentration on melting temperature for this protein? Why is melting temperature a useful measurement to make for a protein especially if you are interested in protein aggregation?
2. | Calculate the overall charge (pH 7) on the following three polypeptides and answer the questions below. Assume the following pKa values: N-terminal -NH3®, 7.0; all -COOH groups, 4.0; Arg, 12.5; Cys, 8.4; His, 6.0; Lys, 10.0; Tyr, 10.0. (A) Ser-Tyr-Ser-Met-Glu-His-Phe-Arg-Trp-Gly-Lys-Pro-Val-Gly-Lys-Lys-Arg-Arg-Pro-Val-Lys-Val-Tyr-Pro-Asp-Ala -Gly- Glu-Asp-Gln- Ser-Ala-Glu-Ala-Phe-Pro-Leu-Arg-Glu-Phe (B) Ser-Tyr-Ser-Met-Glu–His-Phe-Arg–Trp–Gly-Ala-Pro-Val-Gly-Glu-Glu-Cys-Asp-Pro-Val-Glu–Val-Tyr-Pro-Asp- Ala-Gly-Glu-Asp-Gln-Ser-Ala-Glu-Ala-Phe-Pro-Leu-Glu-Phe-Cys-Ser-Tyr-Ser-Met-Glu-His-Phe-Asp-Trp-Gly- Asp-Pro-Val-Gly-Pro-Asp-Ala-Gly-Asp-Gln-Pro-Val-Gly-Glu-Glu-Cys-Asp-Pro-Val-Glu-Val-Tyr-Pro-Asp-Ala | (C) Gly-Ser-Val-Arg-Asp-Pro-Val-Lys-Glu–Val-Tyr-Pro-Asp- Lys-Ala-Gly-Arg-Glu-Ser-Arg-Ala (a) Which of the three peptides would elute first from a gel filtration column? (b) Which of the three peptides would migrate the fastest on SDS-PAGE (c) Which of the three peptides could be…
4. You're working on a structure of a protein and its folding. You think that the interaction between Asp123 and Arg29 is important in determining the structure of the protein. a) What type of amino acid is Asp (acidic, basic, hydrophobic, or polar)? b) What type of amino acid is Arg (acidic, basic, hydrophobic, or polar)? c) What is the strongest interaction that can form between Asp123 and Arg29? You create a mutant Arg29> Lys d) What type of amino acid is Lys (acidic, basic, hydrophobic, or polar)? e) Would you expect this substitution mutation to cause major folding problems? Why or why not? You create mutant Arg29> Glu you discover that this mutant is unable to fold properly, so the protein is nonfunctional. f What type of amino acid is Glu (acidic, basic, hydrophobic, or polar)? g) How does this amino acid substitution cause the protein to fold incorrectly? You find another mutant that also as the same Arg29> Glu mutation. However, this mutant protein įs able to fold normally.…
10. A new protein of unknown structure has been purified. Gel filtration chromatography reveals that the physiological protein has a molecular weight of 240,000 Daltons. Chromatography in the presence of 6 M urea yields a single peak corresponding to a protein of 60,000 Daltons. Chromatography in the presence of 6 M urea and 10 mM mercaptoethanol yields peaks for proteins of 34,000 Daltons and 26,000 Daltons. What can we learn about protein's tertiary and quaternary structure from this data?
4. Deducing quaternary structure via SDS-PAGE. SDS-PAGE is a convenient method for separating polypeptides solely on the basis of size. Small polypeptides travel faster than large ones; rate of migration through the gel is inversely proportional to the logarithm of molecular weight. The subunit structure of a multimeric protein often can be deduced using this technique in conjunction with a protein cross-linking agent. Cross-linking agents react with amino acid residues of two polypeptides that are in contact, thereby linking them by covalent bonds. After limited treatment with the reagent, so that some but not all subunits become cross-linked to their neighbors, the protein is subjected to SDS-PAGE and the molecular weights of the resulting proteins (bands) are estimated. The results of such experiments on two proteins (Protein A and Protein B) are shown below. What is the most likely subunit structure of each protein? Protein A SDS-PAGE cross-linking agent MW 105,000 70,000 35,000…
Explain
Analyse and interpret the SCAM data in Fig. 1, and make a table (remember to include a legend) to indicate where each amino acid is located (cytoplasm, membrane, periplasm).
What are the roles of sodium dodecyl sulfate (SDS) in two-dimensional electrophoresis? to cause bound proteins to have a large positive charge to denature proteins to cause bound proteins to have a large negative charge to preserve zero net charge of the proteins to preserve the structure of the bound proteins Incorrect
What protein structure is represented in either panel of the figure above? Question 11 options: a) Quaternary b) Secondary c) Tertiary d) Quinary e) Primary

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