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Structural Characterization of the Thermally Tolerant Pectin Methylesterase Purified from Citrus sinensis Fruit and Its Gene Sequence

Identifieur interne : 001113 ( Main/Exploration ); précédent : 001112; suivant : 001114

Structural Characterization of the Thermally Tolerant Pectin Methylesterase Purified from Citrus sinensis Fruit and Its Gene Sequence

Auteurs : Brett J. Savary [États-Unis] ; Prasanna Vasu [États-Unis, Inde] ; Randall G. Cameron [États-Unis] ; T. Gregory Mccollum [États-Unis] ; Alberto Nunez [États-Unis]

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RBID : Pascal:14-0041424

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English descriptors

Abstract

Despite the longstanding importance of the thermally tolerant pectin methylesterase (TT-PME) activity in citrus juice processing and product quality, the unequivocal identification of the protein and its corresponding gene has remained elusive. TT-PME was purified from sweet orange [Citrus sinensis (L.) Osbeck] finisher pulp (8.0 mg/1.3 kg tissue) with an improved purification scheme that provided 20-fold increased enzyme yield over previous results. Structural characterization of electrophoretically pure TT-PME by MALDI-TOF MS determined molecular masses of approximately 47900 and 53000 Da for two principal glycoisoforms. De novo sequences generated from tryptic peptides by MALDI-TOF/TOF MS matched multiple anonymous Citrus EST cDNA accessions. The complete tt-pme cDNA (1710 base pair) was cloned from a fruit mRNA library using RT- and RLM-RACE PCR. Citrus TT-PME is a novel isoform that showed higher sequence identity with the multiply glycosylated kiwifruit PME than to previously described Citrus thermally labile PME isoforms.


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<div type="abstract" xml:lang="en">Despite the longstanding importance of the thermally tolerant pectin methylesterase (TT-PME) activity in citrus juice processing and product quality, the unequivocal identification of the protein and its corresponding gene has remained elusive. TT-PME was purified from sweet orange [Citrus sinensis (L.) Osbeck] finisher pulp (8.0 mg/1.3 kg tissue) with an improved purification scheme that provided 20-fold increased enzyme yield over previous results. Structural characterization of electrophoretically pure TT-PME by MALDI-TOF MS determined molecular masses of approximately 47900 and 53000 Da for two principal glycoisoforms. De novo sequences generated from tryptic peptides by MALDI-TOF/TOF MS matched multiple anonymous Citrus EST cDNA accessions. The complete tt-pme cDNA (1710 base pair) was cloned from a fruit mRNA library using RT- and RLM-RACE PCR. Citrus TT-PME is a novel isoform that showed higher sequence identity with the multiply glycosylated kiwifruit PME than to previously described Citrus thermally labile PME isoforms.</div>
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