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. 1984 May;81(10):2960–2964. doi: 10.1073/pnas.81.10.2960

Structure and expression of a pea nuclear gene encoding a chlorophyll a/b-binding polypeptide

Anthony R Cashmore 1
PMCID: PMC345200  PMID: 16593461

Abstract

A nuclear gene AB80 has been isolated from a phage λ Charon 4 library of pea DNA. The sequence of the gene has been determined and it has been shown to contain an uninterrupted reading frame of 269 amino acids, corresponding to a precursor to a constituent polypeptide of the light-harvesting chlorophyll a/b-protein complex. Primer extension and S1 nuclease studies defined a cap site for AB80. The first methionine codon 3′ from this site is 69 nucleotides away and is the initiating codon of the open reading frame. A “TATA” sequence occurs 31 nucleotides 5′ from the cap site. A second TATA sequence is found 7 nucleotides on the 5′ side of the initiating methionine codon and the sequences surrounding this TATA sequence are strikingly similar to those surrounding the first TATA sequence. The mature polypeptide encoded by AB80 differs by 5 amino acids from the polypeptide corresponding to a previously characterized cDNA sequence pAB96. This result is indicative of heterogeneity within the constituent polypeptides of the light-harvesting chlorophyll a/b-protein complex. The sequence Arg-Lys-Ser-Ala-Thr-Thr-Lys-Lys occurs at, or near, the NH2-terminus of the mature polypeptide encoded by AB80. This basic peptide is of interest because of its apparent involvement in changes in excitation-energy distribution in chloroplast membranes. Some general similarities, but no extensive sequence homology, is found on comparing the transit sequence for the precursor to the chlorophyll a/b-binding polypeptide with the transit sequences previously determined for the precursors to the small subunit of ribulose-1,5-bisphosphate carboxylase.

Keywords: transit sequence, “TATA” sequence, transcript mapping, uninterrupted reading frame, multiple chlorophyll a/b binding polypeptides

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Selected References

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