Draw a structure for a peptide that gives Gly, Ile & Phe on hydrolysis and fails to react with phenyl isothiocyanate. Mass spectrometry gives a molar mass of 317 for this peptide.
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- Draw a structure for a peptide that gives Ala, Leu & Val on hydrolysis and fails to react with phenyl isothiocyanate. Mass spectrometry gives a molar mass of 283 for this peptide. Draw the predominant structure at pH 7 using the charge tools to adjust formal charges. • You do not have to consider stereochemistry. You do not have to explicitly draw H atoms. • Do not include lone pairs in your answei. opy aste ChemDoodle21-43 Give appropriate names for the following compounds: (а) (b) (с) CH;CH,CH,CH2 -C-ci Ph CH, CH,CH-C-N-Ph (d) (e) () H. CH3CH N-ċ-Ph CH3CH,-Č-0-Ph CH3CH 0-C-Ph (g) hoonon (h) (1) CH;CH,O OCH CH, (G) (k) (1) H,C CH- C-N(CH,CH3)2 H;C O.6, The structure originelly proposed For Cordycepic acid, [a] +40.3°, has been + 40.3°, has been shown to be in Correct, suggest to be reason skeptical obout the original Structure, which is given below CO2H 1.29 HO HO.
- What is the structure that best represents the following amino acid at pH = 10? wolzle H₂N NH₂ O A A HN H₂N B NH₂ i NH₂ OH H₂N C NH3 H₂N NH₂ D OHDraw a structure for a peptide that gives Ala, Leu & Val on hydrolysis and fails to react with phenyl isothiocyanate. Mass spectrometry gives a molar mass of 283 for this peptide. Draw the predominant structure at pH 7 using the charge tools to adjust formal charges. You do not have to consider stereochemistry. You do not have to explicitly draw H atoms. • Do not include lone pairs in your answer. They will not be considered in the grading. 85 کر ChemDoodleⓇ ル نےTreatment of a new protein with dansyl chloride reveals two (2) dansyl-labelled derivatives of amino acids, alanine and methionine. What can you deduce about the structure of the proteinfrom these results?
- Structure pK, K. Name NH; CHCH,-O 2.20 (СО,Н) 9.31 (NH,) 6.3 X 10-3 4.9 x 10-10 Phenylalanine CO,H 7.11 x 10-3 6.34 x 10-8 2.148 * 7.198 Phosphoric acid* (hydrogen phosphate) НО — Р— Он 12.375 4.22 X 10-13 OH (1.5) 6.78 3 x 10-2 1.66 x 10-7 HP- он Phosphorous acid (hydrogen phosphite) OH 1.12 x 10-3 3.90 x 10-6 2.950 Phthalic acid (benzene-1,2-dicarboxylic acid) 5.408 cO,H Piperazine (perhydro- 1,4-diazine) 5.333 9.731 4.65 x 10-6 1.86 X 10-10 11.125 7.50 x 10-12 Piperidine 1.12 x 10-2 2.29 x 10-11 -co,H 1.952 (СO,Н) 10.640 (NH,) Prolinc +H 4.874 1.34 x 10-5 Propanoic acid CH,CH,CO,H H,C=CHCO,H 4.258 5.52 x 10-5 Propenoic acid (аcrylic acid) 10.566 2.72 x 10-11 Propylamine CH;CH,CH,NII; 5.20 6.3,X 10-6 Pyridine (azine) Pyridine-2-carboxylic acid (picolinic acid) (1.01) (CO,H) 5.39 (NH) 9.8 x 10-2 4.1 x 10-6 co,H HO,C Pyridine-3-carboxylic acid (nicotinic acid) 2.03 (CO,H) 4.82 (NH) 9.3 x 10-3 1.51 x 10-s NH+ 1.4 (POH) (u = 0.1) 3.44 (OH) (1p. = 0.1) 6.01 (POH) (u = 0.1) 8.45 (NH) (u =…Select the correct representation of this aminoacid in aqueous solution at the stated pH values. pKa (a-CO₂H) = 2.20 pK₂ (α-NH₂) = 9.11 pKa (side chain OH) = 10.07 pl = 5.63 HO Lont out on on OH OH NH₂ NH₂ NH₁ HO NH₂ B D at pH 1 HO NH₂ of of an OH NH₂ NH₂ NH3 O E F G at pH 9.59 at pH 13. at pH 5.63 (the isoelectric point) HO OH HO [Choose ] [Choose ] [Choose ] [Choose ] an NH3 H OH(b) Using alanine as an example, draw possible conformations of alanine in a peptide chain and identify which conformer is favoured. (c) Discuss how considering 'allylic strain' [see pages 33-39 of handout 1] can explain the favoured conformation in part b above, and how this is relevant to the B-sheet conformation in peptides/proteins.
- (b) Describe how the charge of some amino groups in a protein might differ at pH 9.0 and pH 5.0. the charge on the amino group will differ at pH 5 and pH 9 which will depend on the pKa of the amino acid. (c) Describe how the charge of some carboxyl groups in a protein might differ at pH 9.0 and pH 5.0. charge on carboxyl group will differ at pH 5 and pH 9 which will depend on the pKa of the amino acid. (d) Given your answers to parts (b) and (c), what kind of intramolecular interactions in beta-galactosidase are most likely to be affected by a change in pH from 9.0 to 5.0? (e) Could the interactions you mention in part (d) affect the catalytic activity of beta-galactosidase?The above amino acid, shown at pH = 7.0 and where every atom (including hydrogens!) is visible, is (D or L) -X-n5of 15 > Glycine is a diprotic acid, which can potentially undergo two dissociation reactions, one for the a-amino group (–NH;), and the other for the carboxyl (–COOH) group. Therefore, it has two pK, values. The carboxyl group has a pKj of 2.34 and the a-aminc group has a pK2 of 9.60. Glycine can exist in fully deprotonated (NH, –CH, –COO"), fully protonated (NH† –CH, -COOH), or zwitterionic form (NH;-CH,-CO0-). Match the pH values with the corresponding form of glycine that would be present in the highest concentration in a solution of that pH. fully deprotonated form fully protonated form zwitterionic form NH,–CH,-COO" NH; –CH,-COOH NH -CH, -COO- Answer Bank pH 7.0 pH 1.0 pH 8.0 pH 11.9 PН 6.0 MacBook Air DII DD F4 F5 F6 F7 F8 F9 F10 F11 F12 $ & * 4 5 6. 7 8. R T. Y U %D F H J K + || * 00 %24