The given oligopeptide Val-Lys-Met-Tyr-Glu-Ser, is composed with acidic glutamic acid or glutamate (Glu), basic lysine (Lys) and four neutral Valine (Val), methionine (Met), tyrosine (Tyr) and Serine (Ser) amino acids.
Hence, since this oligopeptide has been titrated with 5 equivalents of KOH, only its acidic part i.e. glutamic acid (Glu) part will be neutralized or will be titrated.
So, it would definitely follow the weak acid and strong base path of titration. For 5 equivalents of KOH, the normality(N) of the KOH solution is 5 N.
But in this question, I believe some very important data are missing, like pka1, pka2 and pka3 (for acidic or basic) values of the amino acids are missing. The concentration or thev weight of the oligopeptide isn't given (so, how can I calculate the pH of the solution at different steps of the titration). Again, the biggest problem in this question is, the question demand the titration plot of pH (Y-axis) vs 5 equivalents of KOH (X-axis), in this case since the X-axis has only one value, I'm afraid it can't be plotted... More importantly, in practical aspect, the base (i.e. KOH here) should be added dropwise and generally we plot pH vs the volume of base or acid is added... So, please modify the question so that I can answer it properly.
There is many parameters aren't given and even the question seems to be wrong. So, I can't answer properly.
But, yes as it is weak acid vs strong base titration, and if I consider (a) the base, KOH is added from burette and (b) still the concentration or amount of the peptide has to be given, if I consider it is same as the base; Initially, when there is no base has been added i.e. at volum (V) = 0 ml, the pH = pH of the glutamic acid and after this, it gradually increases and the end point might be come at pH of 6-11 (If, concentration are given it can be calculated exactly). Finally after this it increases more as now the solution is become basic, if you add more and more base, finally it would be reached to pH = 14.
for oligopeptide Val-Lys-Met-Tyr-Glu-Ser. sketch the tittation curve frim 0-14 ph y axis vs 5 equvalents of...
If you sketch the titration curve for the following protein (Ser−Tyr−Ser−Met−Glu−His−Phe−Arg−Trp−Gly−Lys−Pro−Val), near what pH values would you expect the curve to exhibit inflections? Assume the pKas of the N- and C-termini are 7.9 and 3.8, respectively. For side chains, assume the pKa values given. The curve will exhibit infections corresponding to ___ group(s) titrating near 4 (____), ___ group(s) near 6.5 (____), ____ group(s) near 8 (____), ___ group(s) near 10 (____) and ___ group(s) near 12 (___). Match the...
Which sequence is more soluble on water. a. Glu-Lys-Leu-Met-His b. Lys-Ser-Ser-Tyr-Glu c. Asp-Phe-Trp-Met-His d. His-Tyr-Ser-Ala-Glu e. His-Ala-Cys-Gly-Glu o
N’-Val-Asp-Ala-Lys-Glu-Gly-Ser-Glu-Gly-Met-Ser-Lys-C' as they occur at pH 8 Tell in detail how to find an isoelectric point!
Can the peptide Ser-Glu-Pro-Ile-Met-Ala-Pro-Val-Glu-Tyr-Pro-Lys be hydrolyzed by chymotrypsin? our teacher indicates that it can, but i was under the impresion that if proline was the next amino acid, then the reaction would not go.
Use the following information to answer questions 4-5. Polypeptide Val—Ala—Lys—Glu—Glu—Phe—Val—Met—Tyr—Cys—Glu—Trp—Met—Gly—Gly—Phe 4. List the peptides formed when the polypeptide shown above is treated with chymotrypsin. 5. Supposed the peptides resultinf from chymotrypsin treatment are then reacted with cyanogen bromide; list the products
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?
The overall charge of the polypeptide His-Tyr-Lys-Met-Ile-Glu at pH 6.9 is __? Please explain how you got the answer.
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...
Tyr-Lys-Met Gly-Pro-Arg Asp-Trp-Tyr Asp-His-Glu Which one of the above tripeptides Leu-Val (a) is most negatively charged at pH 7? (b) will yield DNP-tyrosine when reacted with I-fluoro-2.4-dinitro acid? (e) contains the largest number of nonpolar R (d) contains sulfur? (e) will have the greatest light absorbance at 280 nm? A) (a) D, (b) A (c) E: (d) A, (e) C, B) (a) A: (b) D, (c) E, (d) A, (e) C, C)(a) D, (b) E. (e)A (a A
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...