Residue

My question is regarding mimicing of protein phosphorylation. Changing a serine (Ser) amino acid residue to aspartic acid (Asp) or glutamic acid (Glu) supposedly mimics a phosphorylated serine. 1. How much is it mimicing, can I accept my results based on the presence or ...

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... given the following question: The cdc25 gene of the fission yeast Saccharomyces pombe encodes a phosphatase which dephosphorylates the tyrosine 15 residue of the cyclin-dependent kinase (Cdk). Dephosphorylation of tyrosine-15 of Cdk activates its kinase activity. You introduced a 2nd copy of the ...

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... differs from that of the free amino acids. By comparing the difference spectra with time-release of peptides, they conclude the N-terminal tyrosyl residue interacts with the C-terminus, and that this interaction disappears when the bond between Ala-21 and Ile-22 is cleaved. See the complete article ...

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1 residue: 20 = 20^1 possible sequences 2 residues: 20x20 = 20^2 possible sequences 3 residues: 20x20x20 = 20^3 possible sequences . . . 15 residues: ? It is a large number, just not 15^20. I think you had the right idea, but ...

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by your logic if there was one residue, it would be 1^20? Meaning there's only one outcome?

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