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Novel nuclear‐encoded proteins interacting with a plastid sigma factor, Sig1, in Arabidopsis thaliana 1
Author(s) -
Morikawa Kazuya,
Shiina Takashi,
Murakami Shinya,
Toyoshima Yoshinori
Publication year - 2002
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(02)02388-8
Subject(s) - arabidopsis thaliana , arabidopsis , plastid , sigma factor , biology , microbiology and biotechnology , rna polymerase , dna binding protein , function (biology) , chloroplast , genetics , transcription factor , rna , gene , mutant
Sigma factor binding proteins are involved in modifying the promoter preferences of the RNA polymerase in bacteria. We found the nuclear encoded protein (SibI) that is transported into chloroplasts and interacts specifically with the region 4 of Sig1 in Arabidopsis . SibI and its homologue, T3K9.5 are novel proteins, which are not homologous to any protein of known function. The expression of sibI was tissue specific, light dependent, and developmentally timed. We suggest the transcriptional regulation by sigma factor binding proteins to function in the plastids of higher plant.