Table 2. Raman and UVRR markers of Oxytricha telomeric DNA and related folds^a.

Marker (cm–1)	Assignment	Diagnostic telomeric DNA foldb
610 ± 2	dT4 loop	anti-|| quadruplex or hairpin
674 ± 3	C2′-endo/syn dG	anti-|| quadruplex or hairpin (50% dG)
682 ± 2	C2′-endo/anti dG	anti-|| quadruplex or hairpin (50% dG)
		|| quadruplex (100% dG)
1324 ± 2	C2′-endo/syn dG	anti-|| quadruplex or hairpin (50% dG)
1333 ± 3	C2′-endo/anti dG	anti-|| quadruplex or hairpin (50% dG)
		|| quadruplex (100% dG)
1361 ± 2c	C2′-endo/anti dG	anti-|| quadruplex or hairpin (50% dG)
		|| quadruplex (100% dG)
1481 ± 2	dG N7 strong Hoogsteen H-bond	anti-|| quadruplex or || quadruplex
∼1486	dG N7 weak H-bond to H2O
1579 ± 1	dG N2H interbase H-bond	anti-|| quadruplex, || quadruplex or hairpin
∼1574	dG N2H H-bond to H2O
1603 ± 2	dG N1H interbase H-bond	anti-|| quadruplex, || quadruplex or hairpin
∼1595	dG N1H H-bond to H2O
1722 ± 2	dG O6 interbase H-bond	anti-|| quadruplex, || quadruplex or hairpin
∼1686	dG O6 H-bond to H2O

^aData compiled from this work and previously published results (8,10,15,30,32,34,37,45).

^bData apply to Oxy1.5, Oxy2 and T6Oxy2. Symbols: ||, parallel; anti-||, antiparallel. Where appropriate, percentage residues affected are given in parentheses.

^cBand center depends on G:T content due to overlap with dT marker, 1370 cm^–1.