isomerization depends upon a ferrous heme b cofactor that undergoes redox-regulated ligand-switching between the heme iron and alternate Z-ISO amino acid residues. Presence of a high-spin ferric heme and multiple low-spin hemes with broad EPR signals
in absence of light, the 9,15,9'-tri-cis-zeta-carotene isomer accumulates in etiolated leaves and roots of maize plants carrying the recessive y9 allele in comparison to normal carotenoid composition in light-exposed y9 leaves
Please wait a moment until the data is sorted. This message will disappear when the data is sorted.
the as-purified enzyme (considered to be oxidized), as well as heat denatured Z-ISO, are not functional. Catalytic activity requires pretreatment with dithionite to a final concentration of 10 mM to create reducing conditions