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A Novel Polygalacturonase-Inhibiting Protein (PGIP) from Lathyrus sativus L. Seeds

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Abstract:

Polygalacturonase-inhibiting proteins (PGIPs) are extracellular plant proteins bound to the plant cell wall containing leucine-rich repeats (LRR). They play an important role in plant defence being able to inhibit fungal endopolygalacturonases (EPGs), the first enzymes secreted by phytopathogenic fungi during plant infection. In the present work, a novel PGIP (LsPGIP) has been isolated from Lathyrus sativus seeds. LsPGIP exhibited an inhibitory activity towards EPGs from Aspergillus niger and Rhizopus spp. A pI value of 8.3 and a molecular mass of 40 kDa were determined for the purified inhibitor. Furthermore, N-terminal sequence up to residue 20 revealed that LsPGIP exhibit a high percentage of identity with PGIP from Actinidia deliciosa. A secondary structure similar to those of other polygalacturonase inhibitors was also inferred form circular dichroism data.
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  • Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.
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