Suggest a reasonable strategy for the synthesis of the dipeptide Leu-Phe, using established protocol for peptide...
Suggest a reasonable strategy for the synthesis of the dipeptide Leu-Phe, using established protocol for peptide synthesis.
Homework Answers
The dipeptide is synthesized
by solid phase peptide synthesis , which is also known as
Merrifield synthesis.
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Suggest a reasonable strategy for the synthesis of the dipeptide
Leu-Phe, using established protocol for peptide...
3. A small peptide has the amino acid sequence Phe-Leu-Tyr-Ala-Leu-Gly-Glu. A shorter variant of this peptide...
3. A small peptide has the amino acid sequence Phe-Leu-Tyr-Ala-Leu-Gly-Glu. A shorter variant of this peptide was discovered that had the sequence Phe-Leu-Tyr-Ala; it was demonstrated that this shorter peptide was due to a single base substitution in the second Leu codon. What type of mutation (missense, nonsense, frameshift) gave rise to this shorter peptide? Which of the six possible Leu codons was used in the synthesis of the original (long) peptide (can you eliminate some as possibilities)?
Styles A decapeptide has the following amina acid composition: Arg. Asp, Gly, Leu, Lys, Met, Phe,...
Styles A decapeptide has the following amina acid composition: Arg. Asp, Gly, Leu, Lys, Met, Phe, Ser. Trp, and Val Reacting the native peptide with FDNB and then hydrolyzing released 2.4- dinitrophenylvaline. Brief incubation of the native peptide with carboxypeptidase yielded free Leu. Incubation with cyanogen bromide yielded two fragments: a tetrapeptide with composition Met, Phe, Ser, and Val, and a hexapeptide. The hexapeptide yielded 2.4- dinitrophenylglycine. Proteolytic cleavage by trypsin of the native peptide gave free Leu, a tripeptide,...
3. Amino acid analysis of a peptide seven residues long gave: Asp, Leu, Lys,...
3. Amino acid analysis of a peptide seven residues long gave: Asp, Leu, Lys, Met, Phe, Tyr The following facts were observed: a. Trypsin treatment had no apparent effect b. Reaction with phenylisothiocyanate reagent yielded PTH-Phe c. Treatment with chymotrypsin yielded several products, including a dipeptide and a tetrapeptide. The amino acid composition of the tetrapeptide was Leu, Lys and Met. d. Cyanogen bromide treatment yielded a dipeptide, a tetrapeptide, and free lysine. What is the...
Suggest a reasonable synthetic strategy for the synthesis of 3-ethyl-3-heptanol from methyl pentanoate, CH3CH2CH2CH2CO2CH3.
Suggest a reasonable synthetic strategy for the synthesis of 3-ethyl-3-heptanol from methyl pentanoate, CH3CH2CH2CH2CO2CH3.
Complete hydrolysis of an unknown basic decapeptide gives Gly, Ala, Leu, Ile, Phe, Tyr, Glu, Arg,...
Complete hydrolysis of an unknown basic decapeptide gives Gly,
Ala, Leu, Ile, Phe, Tyr, Glu, Arg, Lys, and Ser.
Problem 24-44 ConstantsI Periodic Table Complete hydrolysis of an unknown basic decapeptide gives Gly, Ala, Leu, lle, Phe, Tyr, Glu, Arg, Lys, and Ser. Terminal residue analysis shows that the N terminus is Ala and the C terminus is lle. Incubation of the decapeptide with chymotrypsin gives two tripeptides, A and B, and a tetrapeptide, C. Amino acid analysis shows that...
5. Consider the following peptide: His-Ser-Gln-Gly-Thr-Phe-Thr-Ser-Asp-Tyr-Ser-Lys-Tyr-Leu-Asp-Ser-Arg-Arg-Ala-Gin- Asp-Phe-Val-Gln-Trp-Leu-Met-Asn-Thr a. What are the fragments, if it is cleaved...
5. Consider the following peptide: His-Ser-Gln-Gly-Thr-Phe-Thr-Ser-Asp-Tyr-Ser-Lys-Tyr-Leu-Asp-Ser-Arg-Arg-Ala-Gin- Asp-Phe-Val-Gln-Trp-Leu-Met-Asn-Thr a. What are the fragments, if it is cleaved by trypsin? b. What are the fragments, if it is cleaved by chymotrypsin? c. What are the fragments, if it is cleaved by pepsin?
Suggest a reasonable synthesis for the following compound using the given starting material and anything else...
Suggest a reasonable synthesis for the following compound using
the given starting material and anything else you need.
Question 3 (9 points) Suggest a reasonable synthesis for the following compound using the given starting material and anything else you need. (Hint: Show the intermediates, not only the conditions, for partial credit) ОН several steps
Suggest a reasonable precursor for the synthesis of 1-chloro-3-ethylbenzene.
Suggest a reasonable precursor for the synthesis of
1-chloro-3-ethylbenzene.
Question Give an mRNA sequence that will code for synthesis of metenkephalin. Tyr-Gly-Gly-Phe-Met Select codons from the following table. If more than one codon is possible for a given amino acid, ch...
Question Give an mRNA sequence that will code for synthesis of metenkephalin. Tyr-Gly-Gly-Phe-Met Select codons from the following table. If more than one codon is possible for a given amino acid, choose only one If there are fewer than 8 amino acids in the peptide, leave the corresponding codons blank. Enter your answer in ALL CAPS, ie, "ATG" not "atg" Third base (3" end) First base (5' end) Second baseUCAG Phe Phe Leu Leu SerSer Ser Ser U Leu Leu...
please explain each question thoroughly. thanks Question 3: Arg-Cys-Met-Ala-Cys-Gly-Arg-Pro-Asn-Tyr-Leu-Trp-Ala-Ile-His-Phe-Ser-Cys-Lys a. What would happen if this peptide...
please explain each question thoroughly. thanks
Question 3: Arg-Cys-Met-Ala-Cys-Gly-Arg-Pro-Asn-Tyr-Leu-Trp-Ala-Ile-His-Phe-Ser-Cys-Lys a. What would happen if this peptide were to be incubated with dinitrofluorobenzene (FDNB) followed by 6M HCl hydrolysis at 1100C for 24 hrs. What labeled product(s) would be detected? Consider the following pepide: What would happen if the peptide were treated with CNBr? What would the products be? Why? b. What would happen if the peptide were treated with chymotrypsin? What would the c. products be? Why? Arg-Cys-Met-Ala-Cys-Gly-Arg-Pro-Asn-Tyr, Leu-Trp, Ala-Ile-His-Phe,...
Styles A decapeptide has the following amina acid composition: Arg. Asp, Gly, Leu, Lys, Met, Phe, Ser. Trp, and Val Reacting the native peptide with FDNB and then hydrolyzing released 2.4- dinitrophenylvaline. Brief incubation of the native peptide with carboxypeptidase yielded free Leu. Incubation with cyanogen bromide yielded two fragments: a tetrapeptide with composition Met, Phe, Ser, and Val, and a hexapeptide. The hexapeptide yielded 2.4- dinitrophenylglycine. Proteolytic cleavage by trypsin of the native peptide gave free Leu, a tripeptide,...
Complete hydrolysis of an unknown basic decapeptide gives Gly,
Ala, Leu, Ile, Phe, Tyr, Glu, Arg, Lys, and Ser.
Problem 24-44 ConstantsI Periodic Table Complete hydrolysis of an unknown basic decapeptide gives Gly, Ala, Leu, lle, Phe, Tyr, Glu, Arg, Lys, and Ser. Terminal residue analysis shows that the N terminus is Ala and the C terminus is lle. Incubation of the decapeptide with chymotrypsin gives two tripeptides, A and B, and a tetrapeptide, C. Amino acid analysis shows that...
5. Consider the following peptide: His-Ser-Gln-Gly-Thr-Phe-Thr-Ser-Asp-Tyr-Ser-Lys-Tyr-Leu-Asp-Ser-Arg-Arg-Ala-Gin- Asp-Phe-Val-Gln-Trp-Leu-Met-Asn-Thr a. What are the fragments, if it is cleaved by trypsin? b. What are the fragments, if it is cleaved by chymotrypsin? c. What are the fragments, if it is cleaved by pepsin?
Suggest a reasonable synthesis for the following compound using
the given starting material and anything else you need.
Question 3 (9 points) Suggest a reasonable synthesis for the following compound using the given starting material and anything else you need. (Hint: Show the intermediates, not only the conditions, for partial credit) ОН several steps
Suggest a reasonable precursor for the synthesis of
1-chloro-3-ethylbenzene.
Question Give an mRNA sequence that will code for synthesis of metenkephalin. Tyr-Gly-Gly-Phe-Met Select codons from the following table. If more than one codon is possible for a given amino acid, choose only one If there are fewer than 8 amino acids in the peptide, leave the corresponding codons blank. Enter your answer in ALL CAPS, ie, "ATG" not "atg" Third base (3" end) First base (5' end) Second baseUCAG Phe Phe Leu Leu SerSer Ser Ser U Leu Leu...
please explain each question thoroughly. thanks
Question 3: Arg-Cys-Met-Ala-Cys-Gly-Arg-Pro-Asn-Tyr-Leu-Trp-Ala-Ile-His-Phe-Ser-Cys-Lys a. What would happen if this peptide were to be incubated with dinitrofluorobenzene (FDNB) followed by 6M HCl hydrolysis at 1100C for 24 hrs. What labeled product(s) would be detected? Consider the following pepide: What would happen if the peptide were treated with CNBr? What would the products be? Why? b. What would happen if the peptide were treated with chymotrypsin? What would the c. products be? Why? Arg-Cys-Met-Ala-Cys-Gly-Arg-Pro-Asn-Tyr, Leu-Trp, Ala-Ile-His-Phe,...
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