Given below is a sequence of a polypeptide:AVLLRKIFWEDLAGThe pKas of different groups/side chains are shown in the table below:Group/side chainpkaC-terminus3.5Asp3.9Glu4.1His6.0Cys8.4Tyr10.5Lys10.5Arg12.5N-terminus9.0What is the total charge of this molecule below pH 3.5? [ Select ]What is the total charge of this molecule at pH 5? [Select ]

The pH of the media decides the overall charge on a molecule especially of amino acid side chains.

Answered: Given below is a sequence of a…

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

Can you please identify what type of protein this is?
Within a naturally-occurring polypeptide, under neutral pH conditions (pH = 7.0), which of the following amino acids always has a negatively charged carboxyl group? the first amino acid in the primary structure histidine lysine arginine the last amino acid in the primary structure
At which pH would the peptide with the amino acid sequence 'KEYHR' be found in an IPG (Immobilized pH gradient) strip after successful isoelectric focusing. Show calculation. lonizable groups Alpha amine group of K Side chain group of K Side chain group of E Side chain group of Y Side chain group of H Side chain group of R Alpha carboxylic acid group of R pka 8.95 10.53 4.25 10.07 6 12.48 2.17
Which of the amino acid side-chains would you expect to be protonated (i.e. has not lost its proton) under neutral pH conditions? Include reasons supporting your prediction.
please match all of them
There are around 20 different versions of this molecule, which create different proteins when linked up in different sequences (like different letters making different words). What is one of these linked molecules named? * GLN ASP MET LEU MET SER LYS ASP GLU HIS THR LEU ILE LEU TRP LYS GLY GLN PRO PRO THR GLY: Glycine TRP: Tryptophan HIS: Histidine MET: Methionine THR: Threonine ASP: Aspartic acid LYS: Lysine ILE: Isoleucine LEU: Leucine GLU: Glutamic acid ALA: Alanine PRO: Proline SER: Serine GLN: Glutamine O Carbohydrate O Amino Acid O Nucleotide O Lipid
Consider protein folding that results when the following components interact: Where the solution is at a pH of 7, green (thick-dotted line) represents aspartic acid (R group contains a carboxylic acid with pKa = 4), orange (thick-solid line) represents lysine (R group contains an amine with pKa = 10), and blue (thin-solid line) represents hydrophilic groups. Rank the three complexes in order from lowest to highest dissociation constants Kd (low Kd values correspond to good binding constants and low energy, while high Kd values correspond to low binding constants and high energy) as determined by intermolecular charge-charge interactions. For those complexes with charge-charge interactions being equal, look at the possibility for the formation of hydrogen bonds via carboxylic acid dimers (only possible when the carboxylic acid is protonated) which are low energy structures.
There is parts A-D for the picture provided. A) A peptide has the sequence, Arg-Cys-His-Tyr-Glu-Asn-Lys-Asp. What is the net charge at pH 1? Choices: -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 B) A peptide has the sequence Arg-Cys-His-Tyr-Glu-Asn-Lys-Asp. What is the net charge at pH 5? Choices: -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 C) Same Peptide sequence, What is the net charge at pH8.5, (N-terminus is pronated) Choices: -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 D) A peptide has the sequence, Arg-Cys-His-Tyr-Glu-Asn-Lys-Asp. What is the net charge at pH 13? Choices: -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 Thank You!
At what pH can you separate the following peptides: ala-ala-ala, glu-glu-glu, his-his-his? OA 2.0 B. 4.0 C. 5.0 O D. 7.0 E. 9.5
Suppose you have a solution of a protein, which contains a specific Tyr residue that has an actual (measured) pKa of 8.8. The protein binds a ligand by several noncovalent interactions, one of which is a hydrogen bond in which the Tyr phenolic hydroxyl group must serve as a hydrogen bond donor. Calculate the percentage of the protein molecules in which that tyrosyl residue's phenolic hydroxyl group could serve as a hydrogen bond donor at pH 8.5
What would the net charge be of a polypeptide with the sequence M-D-R-N-Q-K-R-W at pH 8? hint ionizable groups include N-terminus (pKa = 9.0), D (pKa = 3.9), R (pKa = 12.5), K (pКa %3D 10.5) O +2 O-1 O +1
Consider each dipeptide. Part: 0 / 4 Part 1 of 4 HO || H H H3N C-C-N-C-COO Identify the amino acid(s) present in this structure. Check all that apply. U U U glycine cysteine valine alanine Ophenylalanine ☐ U U asparagine tyrosine threonine leucine glutamine serine ☐ isoleucine methionine None of the above X

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