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The plant ferredoxin precursor: nucleotide sequence of a full length cDNA clone
Nucleic Acids Research
|May 10, 1985
Summary
Researchers isolated a Silene pratensis ferredoxin gene, revealing a single-copy gene encoding a precursor protein. This ferredoxin precursor has a transit peptide essential for its function.
Area of Science:
- Molecular Biology
- Plant Biochemistry
Background:
- Ferredoxins are crucial electron carriers in photosynthesis.
- Understanding ferredoxin gene structure is key to plant molecular biology.
Purpose of the Study:
- To isolate and characterize the Silene pratensis ferredoxin gene.
- To analyze the ferredoxin precursor protein and its transit peptide.
Main Methods:
- cDNA library screening using hybrid released translation.
- Nucleotide sequence analysis of cDNA insert.
- S1 nuclease protection assays.
- Southern blot analysis of genomic DNA.
Main Results:
- A cDNA clone (pFD1) containing the complete ferredoxin precursor coding region was obtained.
- The ferredoxin precursor has a molecular weight of 15,300 Da, with a 5,600 Da transit peptide.
- Genomic analysis suggests ferredoxin is encoded by a single-copy gene in Silene pratensis.
- No significant homology was found between ferredoxin and ribulosebisphosphate carboxylase transit sequences, except near the processing site.
Conclusions:
- The ferredoxin gene in Silene pratensis is likely a single-copy gene.
- The characterized ferredoxin precursor and its transit peptide provide insights into protein targeting in plant chloroplasts.
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