Table 3. Estimated Secondary Structure Content (%) of PGA Determined from Fitting to the CD Spectra^a.

secondary structure		pH
		3.6	4.3	5.1	5.4	5.9	7.2	10.4
helix	helix1 (regular)	30.9	58.4	56.8	48.5	20.1	0.0	0.0
	helix2 (distorted)	10.6	19.2	16.7	15.1	9.2	0.0	0.0
antiparallel	anti1 (left-twisted)	2.7	0.0	0.0	0.0	0.0	0.0	0.0
	anti2 (relaxed)	8.0	0.0	0.0	0.0	0.0	0.0	0.0
	anti3 (right-twisted)	0.0	0.0	0.0	0.4	15.3	42.3	43.1
parallel		15.7	1.5	0.0	0.0	0.0	0.0	0.0
turn		16.5	9.5	7.4	10.1	13.1	14.0	13.3
others		15.7	11.4	19.1	26.0	42.4	43.8	43.6
RMSD		0.1114	0.1902	0.1442	0.0636	0.1435	0.728	0.89
NRMSD		0.00561	0.00589	0.0048	0.0026	0.01422	0.06347	0.07192

^aThe fitting has been completed by dividing the spectrum into eight secondary structure elements following ref (83).