1. You are performing mutagenesis to test predictions about which residues are essential for a protein's...
1. You are performing mutagenesis to test predictions about which residues are essential for a protein's function. Which of the each pair of amino acid substitutions listed below would you expect to disrupt protein structure most and WHY?
- Val replaced by F or A
- Lys replaced by Asp or R
- Gln replaced by Glu or Asn
- Pro replaced by His or Gly
Homework Answers
Answer - Pro replaced by His or Gly
Proline is hydrophobic aminoacid which is mutated to His - Positive
charge amino acid which make big difference in protein
structure.
Valine is hydrophobic aminoacid and F-phenylalanine and A-Alanine
are also hydrophobic amino acids so no bid effect will occur in
this mutation.
Add Answer to:
1. You are performing mutagenesis to test predictions about
which residues are essential for a protein's...
Site-directed mutagenesis replaces a specific amino acid in a protein with a different amino acid, and...
Site-directed mutagenesis replaces a specific amino acid in a protein with a different amino acid, and this approach is commonly used by biochemists to determine if an amino acid is essential for a protein’s function and probe that residue’s role in that function. Which of each pair of amino acid substitutions listed below would you expect to disrupt protein structure the most? Explain. a. Gln replaced by Glu or Asn b. Lys replaced with Asp or Arg c. Thr replaced...
When performing site-directed mutagenesis to test predictions about which residues are essential for protein function, which...
When performing site-directed mutagenesis to test predictions about which residues are essential for protein function, which amino acid substitution would disrupt protein structure the most.
On your internship, you visit the Mass Spectrometry Lab. Mass spectrometry can identify short peptide fragments...
On your internship, you visit the Mass Spectrometry Lab. Mass spectrometry can identify short peptide fragments based on their molecular weights. Your fellow intern Jerry has neglected to label his tubes of amyloid beta peptide 42 after digesting them with some proteases that we learned about in Module 6: pepsin, trypsin, and chymotrypsin. Help him figure out what protease is in each tube. Jerry’s supervisor has the fragments listed in the same order as the original peptide primary sequence, which...
PLEASE HELP OCHEM QUESTION 1. In the following protein, identify the type of bonding or interaction...
PLEASE HELP OCHEM QUESTION
1. In the following protein, identify the type of bonding or interaction that is responsible for holding the two peptide chains together at each amino acid pair, above (A) and below (B). Gly - Ala - Ser - Cys - Val - Asp - Leu - Thr - His - Ile-Tyr-Glu - Phe - Lys - Cys - Met - Asn Val - Leu -Gin-Cys - Pro-Lys - Met - Tyr - Asp -Phe-Asn-Lys - Ile...
Question Completion Status: O Tryptophan and tyrosine QUESTION 2 2 points Save Answer Which of the...
Question Completion Status: O Tryptophan and tyrosine QUESTION 2 2 points Save Answer Which of the following stretches of amino acid residues would you expect to find in the interior of protein molecules? O Gly-Tyr-His-Arg-His O Ala-Val-Leu-lle-Trp O Ala-Asp-Asp-Tyr-Arg O Gly-Lys-Ser-Pro-Thr OPhe-Glu-Gin-Glu-Asn QUESTION 3 2 points Save Answer The observation that proteins often renature into their original conformations after
. Insulin (below) is treated with dansyl chloride followed by its complete acidic hydrolysis. Which of the following da...
. Insulin (below) is treated with dansyl chloride followed by its complete acidic hydrolysis. Which of the following dansylated amino acids you expect to observe? A chain Gly-Ile-Val-Glu-Gln-Cys-Cys- Ala-Ser-Val - Cys-Ser-Leu- Tyr-Gln-Leu-Glu-Asn - Tyr-Cys- Asn 10 15 21 B chain Phe-Val - Asn-Gln-His-Leu-Cys-Gly-Ser-His-Leu-Val-Glu - Ala-Leu-Tyr-Leu-Val-Cys-Gly-Glu-Arg-Gly-Phe-Phe-Tyr-Thr-Pro-Lys - Ala 10 20 25 30 15
On your internship, you visit the Mass Spectrometry Lab. Mass spectrometry can identify short peptide fragments...
On your internship, you visit the Mass Spectrometry Lab. Mass spectrometry can identify short peptide fragments based on their molecular weights. Your fellow intern Jerry has neglected to label his tubes of amyloid beta peptide 42 after digesting them with some proteases that we learned about in Module 6: pepsin, trypsin, and chymotrypsin. Help him figure out what protease is in each tube. Jerry’s supervisor has the fragments listed in the same order as the original peptide primary sequence, which...
Which of these protein sequences is most likely to span a cell membrane? Gly-Asp-Val-Ala-Gly-Arg-Gly-Asn-Gly-Lys-Lys-Pro-Ser-Ser-Val-Arg-Ala-Leu-Ser Ile-Val-Leu-Pro-Ile-Val-Leu-Leu-Val-Phe-Leu-Cys-Leu-Gly-Val-Phe-Leu-Leu-Trp Lys-Asn-Trp-Arg-Leu-Lys-Asn-I
Which of these protein sequences is most likely to span a cell
membrane?
Gly-Asp-Val-Ala-Gly-Arg-Gly-Asn-Gly-Lys-Lys-Pro-Ser-Ser-Val-Arg-Ala-Leu-Ser Ile-Val-Leu-Pro-Ile-Val-Leu-Leu-Val-Phe-Leu-Cys-Leu-Gly-Val-Phe-Leu-Leu-Trp Lys-Asn-Trp-Arg-Leu-Lys-Asn-Ile-Asn-ser-Ile-Asn-Phe-Asp-Asn-Pro-Val-Tyr-Gln A. 773 B. 792 C. 811
Table 1: Partial RPE65 protein sequence (amino acids 41-60) for the 9-year-old LCA patient. Unmutated Protein...
Table 1: Partial RPE65 protein sequence (amino acids 41-60) for the 9-year-old LCA patient. Unmutated Protein Sequence Patient's Allele 1 Protein Sequence Patient's Allele 2 Protein Sequence START...Ser-Leu-Leu-Arg-Cyc-Gly-Pro-Gly-Leu-Phe-Glu-Val-Gly-Ser-Glu-Pro-Phe-Tyr- His-Gly...STOP START...Ser-Leu-Leu-Gin-Cyc-Gly-Pro-Gly-Leu-Phe-Glu-Val-Gly-Ser-Glu-Pro-Phe-Tyr- His-Gly...STOP START...Ser-Leu-Leu-Gin-Cyc-Gly-Pro-Gly-Leu-Phe-Glu-Val-Gly-Ser-Glu-Pro-Phe-Tyr- His-Gly...STOP Table 2. Partial RPE65 protein sequence (amino acids 61-70 and 291–300) for the 11-year-old LCA patient. Unmutated Protein Sequence Patient's Allele 1 Protein Sequence Patient's Allele 2 Protein Sequence START...Phe-Asp-Gly-Gln-Ala-Leu-Leu-His-Lys-Phe...lle-Ala-Asp-Lys-Lys-Arg-Lys-Lys- Tyr-Leu...STOP START...Phe-Asp-Gly-Gln-Ala-Leu-Leu-Tyr-Lys-Phe...lle-Ala-Asp-Lys-Lys-Arg-Lys-Lys- Tyr-Leu...STOP START...Phe-Asp-Gly-Gln-Ala-Leu-Leu-His-Lys-Phe...lle-Ala-Asp-Lys-STOP Source: Data from Russell et al. (2017). Use Tables 1 and 2 to...
1. As we increase our understanding of how proteins fold, we can start making predictions off...
1. As we increase our understanding of how proteins fold, we can start making predictions off of the primary amino acid sequence, about how a protein will fold. Use the peptide he answer the following questions: lle-Ala-His-Thr-Tyr-Gly-Pro-Phe-Glu-Ala-Ala-Met-Cys-Lys- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Trp-Glu-Ala-Gln-Pro-Asp-Gly-Met-Glu-Cys-Ala-Phe-His-Arg 15 16 17 18 19 20 21 22 23 24 25 26 27 28 a. In the amino acid sequence above, where would you predict that bends or...
PLEASE HELP OCHEM QUESTION
1. In the following protein, identify the type of bonding or interaction that is responsible for holding the two peptide chains together at each amino acid pair, above (A) and below (B). Gly - Ala - Ser - Cys - Val - Asp - Leu - Thr - His - Ile-Tyr-Glu - Phe - Lys - Cys - Met - Asn Val - Leu -Gin-Cys - Pro-Lys - Met - Tyr - Asp -Phe-Asn-Lys - Ile...
Question Completion Status: O Tryptophan and tyrosine QUESTION 2 2 points Save Answer Which of the following stretches of amino acid residues would you expect to find in the interior of protein molecules? O Gly-Tyr-His-Arg-His O Ala-Val-Leu-lle-Trp O Ala-Asp-Asp-Tyr-Arg O Gly-Lys-Ser-Pro-Thr OPhe-Glu-Gin-Glu-Asn QUESTION 3 2 points Save Answer The observation that proteins often renature into their original conformations after
. Insulin (below) is treated with dansyl chloride followed by its complete acidic hydrolysis. Which of the following dansylated amino acids you expect to observe? A chain Gly-Ile-Val-Glu-Gln-Cys-Cys- Ala-Ser-Val - Cys-Ser-Leu- Tyr-Gln-Leu-Glu-Asn - Tyr-Cys- Asn 10 15 21 B chain Phe-Val - Asn-Gln-His-Leu-Cys-Gly-Ser-His-Leu-Val-Glu - Ala-Leu-Tyr-Leu-Val-Cys-Gly-Glu-Arg-Gly-Phe-Phe-Tyr-Thr-Pro-Lys - Ala 10 20 25 30 15
Which of these protein sequences is most likely to span a cell
membrane?
Gly-Asp-Val-Ala-Gly-Arg-Gly-Asn-Gly-Lys-Lys-Pro-Ser-Ser-Val-Arg-Ala-Leu-Ser Ile-Val-Leu-Pro-Ile-Val-Leu-Leu-Val-Phe-Leu-Cys-Leu-Gly-Val-Phe-Leu-Leu-Trp Lys-Asn-Trp-Arg-Leu-Lys-Asn-Ile-Asn-ser-Ile-Asn-Phe-Asp-Asn-Pro-Val-Tyr-Gln A. 773 B. 792 C. 811
Table 1: Partial RPE65 protein sequence (amino acids 41-60) for the 9-year-old LCA patient. Unmutated Protein Sequence Patient's Allele 1 Protein Sequence Patient's Allele 2 Protein Sequence START...Ser-Leu-Leu-Arg-Cyc-Gly-Pro-Gly-Leu-Phe-Glu-Val-Gly-Ser-Glu-Pro-Phe-Tyr- His-Gly...STOP START...Ser-Leu-Leu-Gin-Cyc-Gly-Pro-Gly-Leu-Phe-Glu-Val-Gly-Ser-Glu-Pro-Phe-Tyr- His-Gly...STOP START...Ser-Leu-Leu-Gin-Cyc-Gly-Pro-Gly-Leu-Phe-Glu-Val-Gly-Ser-Glu-Pro-Phe-Tyr- His-Gly...STOP Table 2. Partial RPE65 protein sequence (amino acids 61-70 and 291–300) for the 11-year-old LCA patient. Unmutated Protein Sequence Patient's Allele 1 Protein Sequence Patient's Allele 2 Protein Sequence START...Phe-Asp-Gly-Gln-Ala-Leu-Leu-His-Lys-Phe...lle-Ala-Asp-Lys-Lys-Arg-Lys-Lys- Tyr-Leu...STOP START...Phe-Asp-Gly-Gln-Ala-Leu-Leu-Tyr-Lys-Phe...lle-Ala-Asp-Lys-Lys-Arg-Lys-Lys- Tyr-Leu...STOP START...Phe-Asp-Gly-Gln-Ala-Leu-Leu-His-Lys-Phe...lle-Ala-Asp-Lys-STOP Source: Data from Russell et al. (2017). Use Tables 1 and 2 to...
1. As we increase our understanding of how proteins fold, we can start making predictions off of the primary amino acid sequence, about how a protein will fold. Use the peptide he answer the following questions: lle-Ala-His-Thr-Tyr-Gly-Pro-Phe-Glu-Ala-Ala-Met-Cys-Lys- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Trp-Glu-Ala-Gln-Pro-Asp-Gly-Met-Glu-Cys-Ala-Phe-His-Arg 15 16 17 18 19 20 21 22 23 24 25 26 27 28 a. In the amino acid sequence above, where would you predict that bends or...
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