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Characterisation of a chloroplast‐encoded sec Y homologue and atpH from a chromophytic alga Evidence for a novel chloroplast genome organisation
Author(s) -
Scaramuzzi Carol D.,
Stokes Harold W.,
Hiller Roger G.
Publication year - 1992
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 - 10.1016/0014-5793(92)80601-c
Subject(s) - chloroplast , gene , gene cluster , genome , biology , ribosomal protein , plastid , chloroplast dna , genetics , ribosomal rna , microbiology and biotechnology , rna , ribosome
sec Y is a prokaryotic gene that encodes the SecY protein, an integral membrane component of the prokaryotic protein translocation apparatus. A chloroplast‐encoded sec Y homologue has been identified in the unicellular, chromophytic alga, Pavlova lutherii . The gene predicts a protein composed of ten membrane‐spanning regions, that is approximately 25% homologous and 50% similar to bacterial and plastid SecY proteins. The sec Y gene from P. lutherii is independent of the ribosomal protein ( rp ) gene cluster to which it is closely linked in other organisms. In P. lutherii sec Y is located 5′ to atpI and atpH . Since, in higher plants the atpIHFA gene cluster and the rp gene cluster are separated by approximately 50 kb, we conclude, this indicates a novel chloroplast gene arrangement in P. lutherii .