Table 6. Occurrence of each pucker conformation in non-type-1 loops.
C1’-endo | C2’-endo | C3’-endo | C1’-exo | C2’-exo | C3’-exo | C4’-exo | O4’-endo | % C2’-endo for non-type-1 loops | % C2’-endo for type-1 loops | |
---|---|---|---|---|---|---|---|---|---|---|
T | 1 | 9 | 2 | 1 | 0 | 2 | 1 | 1 | 52.9% (9/17) | 23.1% (6/26) |
T | 0 | 10 | 3 | 2 | 1 | 1 | 0 | 0 | 58.8% (10/17) | 0.0% (0/26) |
A | 0 | 8 | 0 | 6 | 0 | 0 | 2 | 1 | 47.1% (8/17) | 88.5% (23/26) |
There is a pronounced shift towards C2’-endo puckering for all residues of the TTA loops for non-type-1 loops when compared to type-1 loops (highlighted in bold).