Question & Answer: An oligomeric protein has a molecular weight of 357000. A 850 mg sample was treated with an…..

tion 19 of 25 Incorrect : Incorrect Sapling Learning An oligomeric protein has a molecular weight of 357000. A 850 mg sample was treated with an excess of 1-fluoro-2.4-dinitrobenzene (Sangers reagent) until the reaction was complete. Next the pept were hydrolyzed by heating with concentrated HCl. The pr ent) until the reaction was complete. Next the peptide bonds of r ami no mids nblW and no other 2.4-dinitrophenyl derivatives of the a-amino groups of e complete h acids could be found. drolysis contained 1.8 How many polypeptide chains are in this protein? (Enter your answer as a whole number). NO2 Number CH3 235 2.28 is ilable! View this feedback by clicking on the bottom

An oligomeric protein has a molecular weight of 357000. A 850 mg sample was treated with an excess of 1-fluoro-2, 4-dinitrobenzene (Sanger’s reagent) until the reaction was complete. Next the peptide bonds were hydrolyzed by heating with concentrated HCl. The product of the was complete hydrolysis contained 1.8 mg of the compound shown below, and no other 2, 4-dinitrophenyl derivatives of the alpha-amino groups of other amino acids could be found. How many polypeptide chains are in this protein? (Enter your answer as a whole number).

Expert Answer

the molecular weight of the sample = 357000 mg/mmol

Calculate the molecular weight of protein as shown in the figure = C9N3O6H9 = 9*12+3*14+16*6+1*9 = 108+42+96+9

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= 255 mg/mmol

m moles of the compound protein shown in the figure =

=1.8 mg/255 mg/mmol = 0.00706 mmoles

mmoles of the sample = 850 mg/357000 mg/mmole

= 0.00238 mmoles

Polypeptide chains in the Protein = mmoles of protein / mmoles of sample

= 0.00706 / 0.00238 = 2.97

In the whole number, polypeptide chains = 2

Since the calculation is very sensitive in integers, then 2.97 can also be considered as 3. However the perfect answer is 2.

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