The presequence of the precursor to the nucleus-encoded 30 kDa protein of photosystem II in Euglena gracilis Z includes two hydrophobic domains.
A cDNA clone for the extrinsic 30 kDa protein (OEC30) of photosystem II in Euglena gracilis Z was isolated and characterized. The open reading frame of the cDNA encoded a polypeptide of 338 amino acids, which consisted of a long presequence of 93 amino acids and a mature polypeptide of 245 amino acids. Two hydrophobic domains were identified in the presequence, in contrast to the presence of a single hydrophobic domain in the presequence of the corresponding proteins from higher plants. At the N- and C-terminal regions, respectively, of the presequence, a signal-peptide-like sequence and a thylakoid-transfer domain were identified. The presence of a long and unique presequence in the precursor to OEC30 is probably related to the complexity of the intracellular processes required for the synthesis and/or transport of the protein in Euglena.
Shigemori
Y
Y
Department of Biology, Faculty of Science, Okayama University, Japan.
Inagaki
J
J
Mori
H
H
Nishimura
M
M
Takahashi
S
S
Yamamoto
Y
Y
D020418:Algal Proteins; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D015152:Blotting, Northern; D015139:Blotting, Southern; D003001:Cloning, Molecular; D004247:DNA; D005056:Euglena gracilis / Q000235:genetics*; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D045322:Photosynthetic Reaction Center Complex Proteins / Q000737:chemistry* / Q000235:genetics; D045332:Photosystem II Protein Complex; D011498:Protein Precursors / Q000737:chemistry* / Q000235:genetics; D015800:Protozoan Proteins; D014867:Water / Q000737:chemistry
D020418:Algal Proteins; D045322:Photosynthetic Reaction Center Complex Proteins; D045332:Photosystem II Protein Complex; D011498:Protein Precursors; D015800:Protozoan Proteins; D014867:Water; D004247:DNA