Peptide nucleic acids (PNAs) are DNA mimics with a peptide backbone. P
NAs are being intensely investigated owing to a potential as gene-targ
eted drugs, A PNA (H-GTAGATCACT-NH2)-DNA (5'-AGTGATCTAC-3') complex ha
s been crystallized in a tetragonal space group P4(1)22 with cell dime
nsions a = b = 79.8, c = 99.9 Angstrom, The crystals diffract to about
5 Angstrom resolution.