can you help me with this question pleaseHomework Answers
Take the pKa value from table and consider only the amino group of first amino acid, side chain groups and carboxylic group of last amino acid. All the amino and carboxylic group in the middle are part of peptide bond. So they can't influence charge
Charge at pH 2
Cys has +1 charge at amino group
Phe, Asn, Glu and Ile are neutral (Phe, Asn, Ile doesn't have any charge side chain group)
Cys, Pro, and Gly are neutral
His has +1 charge
So the net chare on peptide is +2
Charge at pH 8.5
Cystein side chain has SH that does participate in charge distribution. Amino group of cystein has pKa around 10 and will not give proton at pH 8.5. So cystein would have +1 charge.
Phe, Iso are neutral
Glu has -1 charge due deprotonated carboxylic group
Asn, Pro, Cys, and His would be neutral
Gly has -1 charge due to deprotonated carboxylic group.
So net charge would be -1.
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can you help me with this question please
1. Examine the peptide below and determine the...
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...
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...
. 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
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,...
help with these please Examine the peptide. Thr-Glu-Pro-Ile-Val-Ala-Pro-Met-Glu-Tyr-Gly-Lys Write the sequence using one-letter abbreviations. sequence: TKPIVAPMEYGK...
help with these please
Examine the peptide. Thr-Glu-Pro-Ile-Val-Ala-Pro-Met-Glu-Tyr-Gly-Lys Write the sequence using one-letter abbreviations. sequence: TKPIVAPMEYGK Estimate the net charge on the peptide at pH 7. charge at pH 7: Estimate the net charge on the peptide at pH 12. Alpha helices are a type of secondary structure in proteins. What is the length of a 23.0 kDa single-stranded a-helical protein segment? Assume a mean residue mass of 110 Da. length: Beta () sheets are a type of secondary structure...
Met-Ala-Arg-Tyr-Ala-Asn-Asn-Glu__Lys-Glu-Leu-Leu-Tyr__Arg-Tyr-Ala-Asn__Phe-Leu-Ala-Asn-Asn-Ile-Gly-Ala-Asn__Ile-Ser__Ile-Asn-Thr-Glu-Arg-Glu-Ser-Thr-Glu-Asp__Ile-Asn__ His-Glu-Arg__Phe-Ala-Thr-His-Glu-Arg-Ser__Thr-Arg-Ile-Gly-Leu-Tyr-Cys-Glu-Arg-Ile-Asp-
Met-Ala-Arg-Tyr-Ala-Asn-Asn-Glu__Lys-Glu-Leu-Leu-Tyr__Arg-Tyr-Ala-Asn__Phe-Leu-Ala-Asn-Asn-Ile-Gly-Ala-Asn__Ile-Ser__Ile-Asn-Thr-Glu-Arg-Glu-Ser-Thr-Glu-Asp__Ile-Asn__ His-Glu-Arg__Phe-Ala-Thr-His-Glu-Arg-Ser__Thr-Arg-Ile-Gly-Leu-Tyr-Cys-Glu-Arg-Ile-Asp-Glu__Leu-Glu-Val-Glu-Leu-Ser__Ser-Ile-Asn-Cys-Glu__His-Glu-__His-Ala-Pro-Pro-Ile-Leu-Tyr__Glu-Ala-Thr-Ser__Val-Ala-Asn-Ile-Leu-Leu-Ala__Cys-Ala-Lys-Glu-__Ala-Asn-Asp__Pro-Glu-Cys-Ala-Asn__Pro-Ile-Glu__Trp-Ile-Thr-His__Phe-Arg-Ile-Glu-Asp__Cys-His-Glu-Glu-Ser-Glu-Cys-Ala-Lys-Glu__Ile-Cys-Glu__Cys-Arg-Glu-Ala-Met__Glu-Val-Glu-Arg-Tyr-Asp-Ala-Tyr__Ala-Asn-Asp__Ser-His-Glu__Ile-Ser__Asp-Glu-Val-Ala-Ser-Thr-Ala-Thr-Glu-Asp__Thr-His-Ala-Thr__Asp-Ile-Ser-Glu-Ala-Ser-Glu-Ser__Leu-Ile-Lys-Glu__His-Glu-Ala-Arg-Thr__Asp-Ile-Ser-Glu-Ala-Ser-Glu__Ser-Leu-Glu-Glu-Pro__Ala-Pro-Asn-Glu-Ala__Ser-Glu-Val-Glu-Arg-Glu__Trp-Glu-Ile-Gly-His-Thr__Gly-Ala-Ile-Asn__Trp-Ile-Leu-Leu__Ala-Arg-Ile-Ser-Glu__Ile-Phe__His-Glu__Lys-Glu-Glu-Pro-Ser__Thr-His-Ile-Ser__Glu-Ala-Thr-Ile-Asn-Gly__Pro-Ala-Thr-Thr-Glu-Arg-Asn__Tyr-Glu-Thr__Ile-Phe__His-Glu__Trp-Trp-Trp-Trp-Ile-Ile-Ile-Ile-Ile-Leu-Leu-Leu-Leu-Leu-Ser-Ser-Ser-Ser__Cys-His-Ala-Asn-Gly-Glu__Ile-Asn__His-Ile-Ser__Leu-Ile-Phe-Glu-Ser-Thr-Tyr-Leu-Glu__His-Glu__Cys-Ala-Asn__Ser-Thr-Ile-Leu-Leu__Arg-Glu-Met-Ala-Ile-Asn__His-Glu-Ala-Leu-Thr-His-Tyr__Ser-Ala-Ser-Ser-Tyr__Ala-Asn-Asp__Ala-Leu-Arg-IleGly-His-Thr 1.) Write out the 1 letter amino acid abbreviation for each of the three-letter amino acid abbreviated words listed in the given sequence. The __ indicates a space in between the words. Use www.expasy.org and other bioinformatic tools to generate the following bioinformatic data for the given polypeptide sequence. You must give the name and link to the program you used to generate the data: 2.) Compute the pI and Mw (isoelectric point and molecular mass, respectively) of...
Indicate which of the amino acid residues in the following peptide sequence contains a group that...
Indicate which of the amino acid residues in the following peptide sequence contains a group that has a negative charge for its most likely charge state at pH 10. Phe-Val-Pro-His-Trp-Asn-Cys-Thr-Asp Please explain in detail how you got the answer. thank you!
C,D, and E i need help with. 17. The following peptide forms part of Human Hemoglobin...
C,D, and E i need help with.
17. The following peptide forms part of Human Hemoglobin subunit gammaa Asp-Leu-Lys-Gly-Thr-Phe-Ala A) Which amino acids are likely to be on the side of peptid acids are likely to be on the side of peptide that faces the interior of the protein? Insert your answer leu, Gto.Pne, Ala B) Which are likely to be facing the aqueous environment? Insert your answer Asp, lys, Thr Draw the structure of the sequence at pH7.4. Using...
This is the full question. Please let me know what is missing?3. If the...
This is the full question. Please let me know what is missing
?3. If the following polypeptide was digested by trypsin, give the resulting peptides. Glu-Gly-Val-Phe-Ser-Ala-Arg-Ser-Ala-Phe-Lys-Pro-lle-Cys-Lys-Trp-Asp-Val-Met 4. For the following peptide, predict all the b-and y-ion series (with its m/z), under acidic analysis conditions. Ser-Phe-Tyr-Cys-Trp-Ala-Arg The first and last entries have been started. Use the residue amu from slide 28 (Mass Spec II). [For the b-ions start at the top, from Ser. For the y-ions, start at the bottom, from Arg.)
3. A protein contains the following amino acids: O ALA 4 GLN 1 LEU 3 ARG...
3. A protein contains the following amino acids: O ALA 4 GLN 1 LEU 3 ARG 4 GLU 4 LYS 4 ASN 5 GLY O MET 1 ASP 1 HIS 2 PHE 4 ILE 4 PRO 8 SER 5 THR 1 TRP 2 TYR 2 VAL BGYS. a) What is its net charge at pH 1? b) What is its net charge at PH 13? c) Calculate the pl. 4. In what order would the amino acids GLU, LYS, and...
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...
. 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
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,...
help with these please
Examine the peptide. Thr-Glu-Pro-Ile-Val-Ala-Pro-Met-Glu-Tyr-Gly-Lys Write the sequence using one-letter abbreviations. sequence: TKPIVAPMEYGK Estimate the net charge on the peptide at pH 7. charge at pH 7: Estimate the net charge on the peptide at pH 12. Alpha helices are a type of secondary structure in proteins. What is the length of a 23.0 kDa single-stranded a-helical protein segment? Assume a mean residue mass of 110 Da. length: Beta () sheets are a type of secondary structure...
C,D, and E i need help with.
17. The following peptide forms part of Human Hemoglobin subunit gammaa Asp-Leu-Lys-Gly-Thr-Phe-Ala A) Which amino acids are likely to be on the side of peptid acids are likely to be on the side of peptide that faces the interior of the protein? Insert your answer leu, Gto.Pne, Ala B) Which are likely to be facing the aqueous environment? Insert your answer Asp, lys, Thr Draw the structure of the sequence at pH7.4. Using...
This is the full question. Please let me know what is missing
?3. If the following polypeptide was digested by trypsin, give the resulting peptides. Glu-Gly-Val-Phe-Ser-Ala-Arg-Ser-Ala-Phe-Lys-Pro-lle-Cys-Lys-Trp-Asp-Val-Met 4. For the following peptide, predict all the b-and y-ion series (with its m/z), under acidic analysis conditions. Ser-Phe-Tyr-Cys-Trp-Ala-Arg The first and last entries have been started. Use the residue amu from slide 28 (Mass Spec II). [For the b-ions start at the top, from Ser. For the y-ions, start at the bottom, from Arg.)
3. A protein contains the following amino acids: O ALA 4 GLN 1 LEU 3 ARG 4 GLU 4 LYS 4 ASN 5 GLY O MET 1 ASP 1 HIS 2 PHE 4 ILE 4 PRO 8 SER 5 THR 1 TRP 2 TYR 2 VAL BGYS. a) What is its net charge at pH 1? b) What is its net charge at PH 13? c) Calculate the pl. 4. In what order would the amino acids GLU, LYS, and...
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