Question

# Molecular mass of the glycine is 75 g/mol, methionine is 149 g/mol, alanine is 89 g/mol, valine is 117 g/mol and phenylalanine is 165 g/mol. Then what would be the molecular mass of protein with sequence Gly – Ala – Phe – Val – Met – Gly

A
595 g/mol
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B
523 g/mol
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C
670 g/mol
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D
580 g/mol
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Solution

## The correct option is D 580 g/molThis protein has 5 peptide bonds, and during formation of each peptide bond 1 molecule of water having molecular mass of 18 g/mol is removed. So molecular mass of this protein would be = (2 × Gly + Ala + Phe + Val + Met) – (5 × Water) = (2 × 75 + 89 + 165 + 117 + 149) - (5 × 18) = 670 - 90 = 580 g/mol

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