Abstract
AbstractDescribed are the design, synthesis, and biological evaluation of 5 N‐methylated analogs that are based on a lead drug structure LB51. LB51 is a cyclic pentapeptide that inhibits heat shock protein 90 and although a potent inhibitor of the protein function, it has poor cell permeability. Introduction of an N‐methyl moiety at each amino acid produces 5 analogs of LB51, where all 5 show significantly improved membrane permeability over the lead molecule despite the presence of 4 highly polar side chains.
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