The replacement of α(CH 2 ) by NH in monomers of standard aeg PNA and its homologue β-ala PNA leads to respective aza-PNA monomers (1 and 2) in which the N α H can form either an 8membered H-bonded ring with folding of the backbone (DMSO and water) or a 5-membered N α H�αCO (water) to stabilize E-type rotamers. Such aza-PNA oligomers with exclusive E rotamers and intraresidue backbone H-bonding can modulate its DNA/RNA binding and assembling properties.
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