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What is the approximate Mr of the enzyme glycogen phosphorylase, which has 842 amino acid residues?
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4. Protein Structure
Approximating Protein Mass
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Myoglobin is an oxygen-storage protein in muscle tissues. If its molecular weight is 16.7 kDa (1 Da = 1 g/mol), about how many amino acid residues does myoglobin have?
A
86
B
134
C
208
D
153
Guida verificata passo dopo passo1
Understand that myoglobin is a protein composed of amino acid residues, and its molecular weight is given as 16.7 kDa.
Recall that the average molecular weight of an amino acid residue is approximately 110 Da (Daltons). This is a commonly used approximation in biochemistry.
To estimate the number of amino acid residues in myoglobin, divide the total molecular weight of myoglobin by the average molecular weight of an amino acid residue: \( \text{Number of residues} = \frac{16,700 \text{ Da}}{110 \text{ Da/residue}} \).
Perform the division to find the approximate number of amino acid residues in myoglobin. This will give you a rough estimate of the number of residues.
Compare your calculated result with the given options (86, 134, 208) to determine which is closest to your estimate.
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