Medullins A‑H, Sesquiterpenes from Perenniporia medulla-panis, and Their Cellular Signaling Mechanism in HDF Cells

A chemical investigation of an ethyl acetate-soluble layer in the culture broth of Perenniporia medulla-panis resulted in the isolation of eight novel sesquiterpenes conjugated Gly (1), l-Val (2), l-Ala (3), l-Tyr (4), l-Thr (5), l-Ile (6), l-Leu (7), and l-Phe (8). Elucidation of their structures was performed through comprehensive spectroscopic analysis. The absolute configuration of the sesquiterpene skeleton was ascertained using modified Mosher’s methods. The configurations of the amino acid units in compounds 2–8 were identified through acid hydrolysis followed by LC-MS analysis employing Marfey’s method. Compounds 1–3 and 5–8 showed significant regulating effect on MAP kinase activity (p-ERK and p-JNK) in human diploid fibroblast (HDF) cells.