load=1dfm
define ppolar ((_N and protein) or (_O and protein))
define pnotpolar ((_C and protein) or (_S and protein) or (_P and protein))
define pdribose (*.O?' and dna)
define npdribose (*.C?' and dna)
define pacid (*.OP? and dna)
define npacid (*.P and dna)
define p_bg ((DA:*.N6 or DA:*.N7) or (DG:*.O6 or DG:*.N7) or (DC:*.N4) or (DT:*.O4))
define np_bg ((DA:*.C6 or DA:*.C5 or DA:*.C8) or (DG:*.C6 or DG:*.C5 or DG:*.C8) or (DC:*.C6 or DC:*.C5 or DC:*.C4) or (DT:*.C6 or DT:*.C5 or DT:*.C5M or DT:*.C7 or DT:*.C4))
define p_sg ((DA:*.N3 or DA:*.N9) or (DG:*.N3 or DG:*.N9 or DG:*.N2) or (DC:*.O2 or DC:*.N1) or (DT:*.O2 or DT:*.N1))
define np_sg ((DA:*.C2 or DA:*.C4) or (DG:*.C2 or DG:*.C4) or (DC:*.C2) or (DT:*.C2))
select within (3.5, pdribose) and ppolar
select within (4.5, npdribose) and pnotpolar
select within (3.5, pacid) and ppolar
select within (4.5, npacid) and pnotpolar
select within (3.5, p_bg) and ppolar
select within (4.5, np_bg) and pnotpolar
select within (3.5, p_sg) and ppolar
select within (4.5, np_sg) and pnotpolar