Table 1.

Absorption data for 4-HB-CoA and 4-HP-CoA

	4-HB-CoA	4-HP-CoA
Free 4-OH	260, 295 nm	260, 290(sh) nm
Free 4-O−	260, 330 nm	255, 335 nm
Bound to Arth WT	NA*	310 nm
Bound to E73A Arth	313 nm	310 nm
Bound to Pseudo WT	NA*	290 nm

^*These values could not be measured since 4-HB-CoA is a substrate