摘要: ABSTRACT The 4-kDa disulfide-rich peptide (4k-P) is a ligand for the 43-kDa basic glycoprotein (43k-P) in legumes. 4k-P stimulates protein kinase activity of β-subunit 43k-P by binding to α-subunit 43k-P, and regulates growth, differentiation, cell proliferation plant callus. consists 37 residues assumes T-knot scaffold containing three β-strands. shows some structural functional similarity animal hormone receptors. Both locate around plasma membranes walls, showing that present site suitable interaction with signal transduction. may function as receptor protein, respectively.