The PDB codes of the structures used in the analysis Structure Type PDB Codes Noncomplexed A-DNA ( 46 ) 118d, 137d, 138d, 160d, 1d78, 1d79, 1dnz, 1kgk, 1m77, 1ma8, 1mlx, 1nzg, 1vj4, 1xjx, 1z7i, 1zex, ... zey, 1zf1, 1zf6, 1zf8, 1zf9, 1zfa, 213d, 243d, 260d, 295d, 2d94, 317d, 338d, 344d, 345d, 348d, 349d, 368d, 369d, 370d, 371d, 395d, 396d, 399d, 414d, 440d, 9dna, dh010, adh012, adh034 Noncomplexed B-DNA ( 72 ) 122d, 123d, 158d, 183d, 196d, 1bd1, 1bna, 1cw9, 1d23, 1d3r, 1d49, 1d56, 1d61, 1d8g, 1d8x, 1dou, 1dpn, 1edr, 1ehv, 1en3, 1en8, 1en9, 1ene, 1enn, 1fq2, 1g75, 1i3t, 1ikk, 1j8l, 1jgr, 1l4j, 1l6b, 1m6g, 1n1o, 1nvn, 1nvy, 1p4y, 1p54, 1s23, 1s2r, 1sgs, 1sk5, 1ub8, 1ve8, 1zf0, 1zf3, 1zf4, 1zf5, 1zf7, 1zfb, 1zff, 1zfg, 232d, 251d, 2d25, 307d, 355d, 3dnb, 403d, 423d, 428d, 431d, 436d, 454d, 455d, 456d, 460d, 463d, 476d, 477d, 5dnb, 9bna DNA/drug and DNA/ protein complexes, Z-DNA, quadruplexes (329) 110d, 115d, 131d, 145d, 151d, 152d, 159d, 181d, 182d, 184d, 190d, 191d, 1a1g, 1a1h, 1a1i, 1a1k, 1a2e, 1a73, 1aay, 1ais, 1azp, 1b94, 1b97, 1bf4, 1bqj, 1brn, 1c8c, 1cdw, 1ckq, 1cl8, 1cn0, 1d02, 1d11, 1d14, 1d15, 1d21, 1d22, 1d2i, 1d32, 1d37, 1d38, 1d40, 1d41, 1d45, 1d48, 1d53, 1d54, 1d58, 1d67, 1d76, 1d90, 1d9r, 1da0, 1da2, 1da9, 1dc0, 1dc1, 1dcg, 1dcr, 1dcw, 1dfm, 1dj6, 1dl8, 1dn4, 1dn5, 1dn8, 1dnf, 1dp7, 1dsz, 1e3o, 1egw, 1em0, 1emh, 1eo4, 1eon, 1esg, 1eyu, 1f0v, 1fd5, 1fdg, 1fhz, 1fiu, 1fms, 1fn1, 1fn2, 1g2f, 1g9z, 1gtw, 1gu4, 1h6f, 1hcr, 1hlv, 1hwt, 1hzs, 1i0t, 1i3w, 1ick, 1ign, 1ih4, 1ih6, 1imr, 1ims, 1j59, 1j75, 1jb7, 1jes, 1jft, 1jh9, 1jk1, 1jk2, 1jpq, 1jtl, 1juc, 1jux, 1jx4, 1k3w, 1k3x, 1k9g, 1kbu, 1kci, 1kx3, 1kx5, 1l1h, 1l1t, 1l1z, 1l3l, 1l3s, 1l3t, 1l3u, 1l3v, 1lat, 1lau, 1ljx, 1llm, 1lmb, 1m07, 1m19, 1m3q, 1m5r, 1m69, 1m6f, 1mf5, 1mj2, 1mjm, 1mjo, 1mjq, 1mnn, 1mus, 1mw8, 1nh2, 1njw, 1njx, 1nk0, 1nk4, 1nk7, 1nk8, 1nk9, 1nkc, 1nke, 1nkp, 1nnj, 1nqs, 1nr8, 1nt8, 1nvp, 1o0k, 1omk, 1orn, 1p20, 1p3i, 1p3l, 1p71, 1per, 1pfe, 1ph4, 1ph6, 1ph8, 1pji, 1pjj, 1puf, 1pup, 1puy, 1q3f, 1qda, 1qn3, 1qn4, 1qn5, 1qn6, 1qn8, 1qn9, 1qna, 1qnb, 1qne, 1qum, 1qyk, 1qyl, 1qzg, 1r2z, 1r3z, 1r41, 1r68, 1rff, 1rh6, 1rnb, 1rpe, 1rqy, 1run, 1s1k, 1s1l, 1s32, 1ssp, 1suz, 1sx5, 1sxq, 1t9i, 1tdz, 1tez, 1tro, 1u1p, 1u1q, 1u1r, 1u4b, 1ue2, 1ue4, 1uhy, 1v3n, 1v3o, 1v3p, 1vzk, 1w0u, 1wd0, 1wte, 1wto, 1wtp, 1wtq, 1wtr, 1wtv, 1xa2, 1xam, 1xc9, 1xjv, 1xo0, 1xuw, 1xux, 1xvn, 1xvr, 1xyi, 1ytb, 1ytf, 1zez, 1zf2, 1zna, 200d, 210d, 211d, 212d, 215d, 221d, 224d, 234d, 235d, 236d, 241d, 242d, 244d, 245d, 254d, 258d, 276d, 277d, 278d, 279d, 284d, 288d, 292d, 293d, 2bdp, 2bop, 2cgp, 2crx, 2dcg, 2des, 2hap, 2hdd, 2nll, 2or1, 2pvi, 304d, 306d, 308d, 313d, 314d, 331d, 334d, 336d, 351d, 352d, 360d, 362d, 366d, 367d, 383d, 385d, 386d, 3bam, 3bdp, 3cro, 3crx, 3hts, 3pvi, 400d, 417d, 427d, 432d, 441d, 442d, 443d, 452d, 453d, 465d, 467d, 473d, 481d, 482d, 4bdp, adh013, zdf013, zdfb03, zdfb06 The DNA conformational space was investigated at the level of a dinucleotide unit with its 5′-end phosphate group removed; it was described by six backbone torsion angles between γ and δ + 1, plus two χ angles characterizing the glycosidic bond ( Figure 1 ).