At which pH would the peptide with the amino acid sequence 'KEYHR' be found in anIPG (Immobilized pH gradient) strip after successful isoelectric focusing. Showcalculation.lonizable groupsAlpha amine group of KSide chain group of KSide chain group of ESide chain group of YSide chain group of HSide chain group of RAlpha carboxylic acid group of Rpka8.9510.534.2510.07612.482.17

Recall that:A peptide is a short chain of amino acid residues linked together via a peptide bond.…

Answered: At which pH would the peptide with the…

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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Similar questions

An oligopeptide has the following amino acid sequence: NH2-Ala-Glu–Leu–Trp–Tyr-Ser–Gly–Lys–Leu-Ala–Arg-Ala-Phe-Ile-Pro–Gly-COOH a) Estimate the net electric charge of the molecule at pH 8.0 and pH 11.0. b) If the above peptide is passed through a cation exchange chromatographic column (that is, the matrix of the column has negative charges) stabilized at pH 8.0, would you expect it to be retained on the column? c) Indicates the number of fragments, and the sequence of each of them, that would be obtained when treating the peptide in question with: i) trypsin, ii) chymotrypsin.
the following peptide is incubated as chymotrypsin: Gly-Val-Phe-Lys-Ala. Present the detailed chemical mechanism by which chymotrypsin hydrolyzes this peptide. Briefly explain each step. Include only the structure of the final products of the reaction.
Identify the a-carbon of aminolevulinic acid.
The melanocyte-stimulating peptide hormone a-melanotropin has the following sequence:Ser–Tyr–Ser–Met–Glu–His–Phe–Arg–Trp–Gly–Lys–Pro–Val(a) Write the sequence using the one-letter abbreviations.(b) Calculate the molecular weight of a-melanotropin, using data inTable
The pH vs charge graph for a triprotic amino acid is shown below. Please answer the following questions about the amino acid. Net Charge 0 2 4 Alpha amino [Select] 6 R [Select] pH a. Which of the following triprotic amino acids is this? Alpha carboxyl [Select] 8 10 12 [ Select] 14 1 0.5 0 -0.5 -1 b. What is the isoelectric point? (Please select the appropriate range in which the isoelectric point falls) (Hint - look up the pKa values in the pKa table for amino acids, which was in video one of today's lecture) [Select] -1.5 c. What form of this amino acid dominates at a pH of 14? Please select the correct form for each ionizable group. -2
Consider a protein in which a negatively charged glutamic acid side chain (pKa=4.2) makes a salt bridge (ion-ion interaction) with a positively charged histidine side chain (pKa=6.5). Part C: Justify your answer with calculations of partial charges on these amino acid side chains at pH=7.9.(Hint: Consider lessons from Coulomb's law, and the Henderson-Hasselbalch equation.)
What are the charges of the following amino acids peptides at ph 14? 1. GLAVV 2. RRKKQ
Polymer beads (resin) made of DEAE (diethylaminoethyl) cellulose are packed in an ion exchange column. The total mass of beads in the column is 8.47 kg. On average, each bead weighs 0.0023 g and has an average of 18.4 * 10° positively charged amine groups that can adsorba negatively charged protein that passes through the column. A solution containing 2.07 mg/L of a protein is maintained at pH 6.3 and is passed through the ion exchange column at 0.215 L/min. The protein has a molecular weight of 154,000. The pk, of the amino groups on DEAE cellulose is 7.1, and the pl of the protein is 5.6. 2. A. How long can the column be operated before reaching 80% capacity (i.e., 80% of the amino groups on DEAE are bound to the protein through an ionic bond)? You may assume that one protein attaches to one + charge on the beads (although it's possible that proteins attach to more than one + charge). B. After reaching 80% capacity, explain what you would do to release the protein attached to the…
What is the isoelectric point of the following peptide molecule? Asp-His-Glu-Gly-Lys-Tyr-Leu-Phe-Arg-Ser-Cys Relevant pKa values are; 2.2, 3.8, 4.3, 6.0, 8.3, 9.8, 10.1, 10.5, 12.5 and 13.1 3.0 9.1 7.2 5.2 4.1 ONLY one correct answer
Amino acid structure For any ionizable group, indicate the pka value and draw the structure that would be expected at the pH inside the cell (~7.4).
Which of the following statements regarding CoQ is false a. It resides in the inner mitochondrial membrane b. It helps to pump protons after getting oxidized by complex 2 c. It is an electron carrier common to both nadh and fadh2 electron transport chains d. It is a hydrophobic protein
Based on the following image, what is the N-terminal AA residue, C-terminal AA residue? What is also the sequence of peptide 2 and peptide 3? Also identify the overall amino acid sequence

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