Question: For a protein containing no -sheet secondary structure the CD spectrum gives [] 222 = -29,750 deg.cm 2 .decimole -1 . Given from reference spectra

For a protein containing no -sheet secondary structure the CD spectrum gives [] 222 = -29,750 deg.cm 2 .decimole -1 . Given from reference spectra that 100% helix has a [] 222 = -36,000 deg.cm 2 .decimole -1 and 100% coil has a [] 222 = +3,000 deg.cm 2 .decimole -1 .

a). What is the percentage alpha helical content of the protein? Show your working.

b.) The protein and a short duplex oligonucleotide are added at equimolar concentration in a buffer containing 100 mM NaCl and then in a buffer containing 1 M NaCl, the two samples are analysed by CD. The spectra in the 250 to 280 nm region differs considerably between the samples but the spectrums in the 200 230 nm range are similar. What hypothesis can you form concerning the protein

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