Abstract
Opium-poppy (Papaver somniferum L.) latex contains a group of very abundant, laticifer-specific peptides called the major latex proteins (MLPs). We determined a partial amino-acid sequence of an MLP cyanogen bromide peptide fragment that was used to design an MLP oligonucleotide primer. An MLP-specific DNA probe was then generated by polymerase chain reaction (PCR) of first-strand complementary DNA (cDNA) templates primed with the MLP oligonucleotide and oligodeoxythymidylic acid. This DNA fragment, called MLP-PCR, and two partial MLP cDNAs isolated with it, all contain open reading frames matching the known MLP amino-acid sequence. RNA gel blots of latex, tissue cultures, and the major organs of mature plants of opium poppy show that MLP is coded for by an 860-nucleotide mRNA and that this accumulates exclusively in laticifers.
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Abbreviations
- cDNA:
-
complementary DNA
- CNBr:
-
cyanogen bromide
- MLP:
-
major latex protein
- oligo(dT):
-
oligodeoxythymidylic acid
- poly(A)+RNA:
-
polyadenylated RNA
- SDS-PAGE:
-
sodium dodecyl sulfate polyacrylamide gel electrophoresis
- sscDNA:
-
single-stranded complementary DNA
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Nessler, C.L., Vonder Haar, R.A. Cloning and expression analysis of DNA sequences for the major latex protein of opium poppy. Planta 180, 487–491 (1990). https://doi.org/10.1007/BF02411445
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DOI: https://doi.org/10.1007/BF02411445