Table 1.
Numbers of letters of the dinucleotide DNA alphabet CANA observed in the analyzed complexes of regulatory proteins and in nucleosome core particle (NCP). The incidences of the alphabet letter SQX were not analyzed, no Z-DNA letter ZZZ was observed.
| The Main Structural Features of the CANA Letters | CANA Letter | Regulatory | NCP | ||
|---|---|---|---|---|---|
| # | % | # | % | ||
| A-form conformers | AAA | 802 | 4 | 20 | 0.4 |
| conformers bridging A- to B-form | A-B | 925 | 4.7 | 133 | 2.9 |
| conformers bridging B- to A-form | B-A | 1564 | 7.9 | 184 | 4 |
| the most frequent “canonical” B-form | BBB | 7559 | 38.1 | 1548 | 33.7 |
| less populated BI conformer | 2B1 | 1692 | 8.5 | 204 | 4.4 |
| less populated BI conformers with switched values of torsions α and γ | 3B1 | 1346 | 6.8 | 201 | 4.4 |
| conformer bridging BI- to BII-form | B12 | 1380 | 6.9 | 475 | 10.3 |
| BII conformers | BB2 | 1005 | 5.1 | 490 | 10.7 |
| various minor B conformers | miB | 827 | 4.2 | 565 | 12.3 |
| conformers with bases in syn orientation, may occur in quadruplexes, other non-duplexes | SQX | 69 | 0.3 | 0 | 0 |
| non-Assigned Steps | NAN | 2688 | 13.5 | 778 | 16.9 |
| All Steps | ASt | 19,857 | 100 | 4598 | 100 |