Abstract:
:Aps-1 encodes acid phosphatase-1, one of the many acid phosphatases present in tomato (Lycopersicon esculentum Mill.). Aps-1 is closely linked to Mi, a gene conferring resistance against nematodes. Thus, a clone of Aps-1 would provide access to the region of the genome containing Mi. Acid phosphatase-1 was purified from tomato suspension culture cells. Fragmentary amino acid sequences were derived from the purified protein and from its proteolytic and chemical digestion products. One of these amino acid sequences was used to design an oligodeoxyribonucleotide probe expected to hybridize to acid phosphatase-1 cDNA. This probe identified, in a cDNA library, a clone encoding the carboxyl-terminal sequence of a protein that is very similar, but not identical, to acid phosphatase-1. Using this clone, we discovered a second cDNA clone that corresponds in its carboxyl terminal sequence to acid phosphatase-1 but, surprisingly, retains sequences of an Aps-1 intron. The second cDNA clone was used to detect both a cDNA clone and a genomic clone corresponding to Aps-1. The identity of these clones was confirmed by sequence analysis and by the correlation of a restriction fragment length polymorphism with two Aps-1 alleles in a segregating tomato population. The deduced amino acid sequence of the Aps-1 open reading frame predicts a hydrophobic animoterminal signal sequence and a mature protein with a molecular weight of 25,000. The amino acid sequence of this protein has a strong similarity in size and sequence to a vegetative storage protein of soybean.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Williamson VM,Colwell Gdoi
10.1104/pp.97.1.139subject
Has Abstractpub_date
1991-09-01 00:00:00pages
139-46issue
1eissn
0032-0889issn
1532-2548journal_volume
97pub_type
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