Page 8 - V. Proteomics

[V. Proteomics-7]

Identification of rice caleosin gene OsPXG9 with

peroxygenase activity involved in oxylipin pathways

Duc Anh Tran¹, Kyoungwon Cho¹, Oksoo Han¹

¹Department of Food, Bioscience and Biotechnology, Chonnam National University, Gwangju 61186, South Korea

Caleosin is group of genes that are specialized by several structural features, including Calcium binding EF hand
motif, Proline-rich knot region and heme-binding residues. Caleosins are generally involved in variety of biological
functions. Rice, among cereals, is a key crop plant that plays significant roles among human population. Oxylipin

pathways in rice has been researched for a long time, especially octadecanoid pathways that is responsible for

producing jasmonic acid under various stresses. However, there are many other oxylipin pathways are remain
enigmatical. In some plants, caleosins that are reported to have peroxygenase activity are generally play roles in
responding to either biotic or abiotic stresses by involving in oxylipin pathways. In this study, we characterized

information of kinetic and catalyzing mechanism of OsPXG9 protein, suggesting an oxylipin pathway that might
involve in rice plant defense.