Table 1.

Structural feature comparison for all crystal structure complexes reported in the present study

	Homopurine mismatches			Watson–Crick base pairs
Complex name	A:G	G:A-CPX1	G:A-CPX2	C:G	G:C-CPX1	G:C-CPX2
Central base-pair	A4:G11	G4:A11	G4:A11	C4:G11	G4:C11	G4:C11
Central base-pair geometry	anti–anti	syn–anti	‘syn’ like anti–anti	anti–anti	syn–anti	syn–anti
Central base-pair type	Wobble	Wobble	Sugar-edged	Watson–Crick	Hoogsteen	Hoogsteen
Central base-pair C1'–C1' distance (Å)	12.3	10.5	9.0	10.8	9.4	8.8
ActD and Echi intercalation type	Parallel	Parallel	Slanted	Parallel	Parallel	Slanted
DNA conformation	Single strand distortion	Single strand distortion	Sharp bend	Single strand distortion	Four-way junction	Kinked
Backbone shape	‘Chair’ shape	‘Chair’ shape	‘Curve’ shape	‘Chair’ shape	Antiparallel crossover	‘Zig-zag’ shaped
ActD	✓	✓	✓	✓	✓	✓
Echi	✓	✓	✓	✓	✗	✓
PDB ID	7X6R	7XDJ		7X97	7X9F