title: Precursor of the nuclear-encoded extrinsic 30 kDa protein in photosystem II of Euglena gracilis Z is not a polyprotein.
abstract: Polyprotein-type precursors have been reported for the nuclear-encoded proteins such as the small subunit of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) and the apoproteins of light-harvesting chlorophyll-protein (LHC) in Euglena. We report here that the precursor of the extrinsic 30 kDa protein of photosystem II (PS II) encoded by nuclear DNA is not a polyprotein. The precursor was identified as a 45 kDa protein by immunoprecipitation of in vitro translation products of mRNA and by a pulse-chase experiment. It is probable that the structure of the precursor of the nuclear-encoded protein in Euglena chloroplast is closely related to the feature of assembly, as well as of transport, of the protein in chloroplast.
authors.affiliation: Department of Biology, Faculty of Science, Okayama University, Japan.
authors.forename: I
authors.initials: I
authors.lastname: Kuroda
authors.forename: J
authors.initials: J
authors.lastname: Inagaki
authors.forename: Y
authors.initials: Y
authors.lastname: Yamamoto
mesh_terms: D000818:Animals; D002467:Cell Nucleus / Q000378:metabolism; D004247:DNA / Q000235:genetics* / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D005056:Euglena gracilis / Q000235:genetics* / Q000378:metabolism; D007700:Kinetics; D045342:Light-Harvesting Protein Complexes; D008970:Molecular Weight; D045322:Photosynthetic Reaction Center Complex Proteins / Q000096:biosynthesis / Q000235:genetics* / Q000302:isolation & purification; D045332:Photosystem II Protein Complex; D011061:Poly A / Q000378:metabolism; D014176:Protein Biosynthesis; D011498:Protein Precursors / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism; D012313:RNA / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism
chemical_list: D045342:Light-Harvesting Protein Complexes; D045322:Photosynthetic Reaction Center Complex Proteins; D045332:Photosystem II Protein Complex; D011498:Protein Precursors; D012333:RNA, Messenger; D011061:Poly A; D012313:RNA; D004247:DNA