We have characterized a cloned fragment of the spinach plastid chromosome encoding the gene for apocytochrome f. Northern blot analysis and hybrid selection translation discloses that the gene is expressed. From the nucleotide sequence, we deduce that the protein contains 285 amino acids and an amin
Nucleotide sequence of the clustered genes for apocytochromeb6and subunit 4 of the cytochromeb/fcomplex in the spinach plastid chromosome
β Scribed by Wolfgang Heinemeyer; Juliane Alt; Reinhold G. Herrmann
- Publisher
- Springer-Verlag
- Year
- 1984
- Tongue
- English
- Weight
- 705 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0172-8083
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β¦ Synopsis
A 2.4 kilobase-pair segment of the spinach plastid chromosome carrying the genes for apocytochrome b6 and subunit 4 of the thylakoid membrane cytochrome b/f complex has been analysed by DNA sequencing and Northern blot analysis. The nucleotide sequence reveals two uninterrupted open reading frames of 211 and 139 triplets coding for two hydrophobic proteins of 23.7 kd (cytochrome b6) and 15.2 kd (subunit 4). The genes are located on the same strand and are separated from each other by 1018 untranslated base pairs. They map adjacent to the gene for the P680 chlorophyll Ξ± apoprotein of the photosystem II reaction center. The three genes appear to be under common transcriptional control and the transcripts post-transcriptionally modified. The deduced amino acid sequences of cytochrome b6 and subunit 4 both exhibit significant homology with published sequences from mitochondrial b cytochromes (42 kd) suggesting that these functionally equivalent polypeptides in photosynthetic and respiratory electron transport chains arose monophyletically.
π SIMILAR VOLUMES
A 2,900 base pair DNA segment of the spinach plastid chromosome which encodes the genes for the 44 kd chlorophyll a apoprotein and a "32 kd"-like protein of the photosystem II reaction center has been subjected to sequence and Northern blot analysis. The genes are located almost centrally in the lar