title: In vivo and in vitro synthesis of CM-proteins (A-hordeins) from barley (Hordeum vulgare L.).
abstract: CM-proteins from barley endosperm (CMa, CMb, CMc, CMd), which are the main components of the A-hordein fraction, are synthesized most actively 10 to 30 d after anthesis (maximum at 15-20 d). They are synthesized by membranebound polysomes as precursors of higher apparent molecular weight (13,000-21,000) than the mature proteins (12,000-16,000). The largest in vitro product (21,000) is the putative precursor of protein CMd (16,000), as it is selected with anti-CMd monospecific IgG's, and is coded by an mRNA of greater sedimentation coefficient (9 S) than those encoding the other three proteins (7.5 S). CM-proteins always appear in the soluble fraction, following different homogenization and subcellular fractionation procedures, indicating that these proteins are transferred to the soluble fraction after processing.
authors.affiliation: Departamento de Bioquímica, E.T.S. Ingenieros Agrónomos-Universidad Politecnica, Madrid-3, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Paz-Ares
authors.forename: F
authors.initials: F
authors.lastname: Ponz
authors.forename: C
authors.initials: C
authors.lastname: Aragoncillo
authors.forename: C
authors.initials: C
authors.lastname: Hernández-Lucas
authors.forename: G
authors.initials: G
authors.lastname: Salcedo
authors.forename: P
authors.initials: P
authors.lastname: Carbonero
authors.forename: F
authors.initials: F
authors.lastname: García-Olmedo