A pentapeptide was isolated from a cell extract and
Chapter 28, Problem 62(choose chapter or problem)
A pentapeptide was isolated from a cell extract and purified. A portion of the compound was treated with 2,4-dinitrofluorobenzene (DNFB), and the resulting material hydrolyzed (recall Figure 28-10). Analysis of the hydrolysis products revealed one mole of DNPmethionine, two moles of methionine, and one mole each of serine and glycine. A second portion of the original compound was partially hydrolyzed and separated into four products. Separately, the four products were hydrolyzed further, giving the following four sets of compounds: (1) one mole of DNPmethionine, one mole of methionine, and one mole of glycine; (2) one mole of DNP-methionine and one mole of methionine; (3) one mole of DNP-serine and one mole of methionine; (4) one mole of DNP-methionine, one mole of methionine, and one mole of serine. What is the amino acid sequence of the pentapeptide?
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