This is the C-terminal domain of Beta-carotene isomerase D27 that may contain an iron binding domain [1]. Beta-carotene isomerase D27 (also known as Protein DWARF-27) from plants is involved in strigolactones biosynthesis. It is a beta-carotene isomerase that converts all-trans-beta-carotene into 9-cis-beta-carotene, which is cleaved by CCD7 into a 9-cis-configured aldehyde [2,3]. This is an iron-containing protein that localises in chloroplasts and is expressed mainly in vascular cells of shoots and roots [1].

1: DWARF27, an iron-containing protein required for the biosynthesis of strigolactones, regulates rice tiller bud outgrowth. Lin H, Wang R, Qian Q, Yan M, Meng X, Fu Z, Yan C, Jiang B, Su Z, Li J, Wang Y; Plant Cell. 2009;21:1512-1525. PMID:19470589

2: The path from beta-carotene to carlactone, a strigolactone-like plant hormone. Alder A, Jamil M, Marzorati M, Bruno M, Vermathen M, Bigler P, Ghisla S, Bouwmeester H, Beyer P, Al-Babili S; Science. 2012;335:1348-1351. PMID:22422982

3: The Arabidopsis ortholog of rice DWARF27 acts upstream of MAX1 in the control of plant development by strigolactones. Waters MT, Brewer PB, Bussell JD, Smith SM, Beveridge CA; Plant Physiol. 2012;159:1073-1085. PMID:22623516