Involved in strigolactones biosynthesis by catalyzing the isomerization of the C9-C10 double bond in all-trans-beta-carotene leading to 9-cis-beta-carotene and providing the substrate for CCD7. Strigolactones are hormones that inhibit tillering and shoot branching through the MAX-dependent pathway, contribute to the regulation of shoot architectural response to phosphate-limiting conditions and function as rhizosphere signals that stimulate hyphal branching of arbuscular mycorrhizal fungi and trigger seed germination of root parasitic weeds. all-trans-beta-carotene = 9-cis-beta-carotene Recombinant protein contains about 1.7 mole of iron per mole of protein. Expressed in young leaves, axillary buds, inflorescence promodia, lateral roots and crown roots. Expressed in vascular cells in the shoot apex of the main stem and young leaves, the nodal vascular anastomosis and large and small vascular bundles of the internodes. Increased tillers and reduced plant height, reduced levels of strigolactone. Recombinant D27 protein expressed in E.coli contains about 1.7 mole of iron per mole of protein. Truncated N-terminus. Truncated N-terminus.