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Título: Expression analysis by RT-PCR of GIP gene from Phytophthora cinnamomi
Autor: Belo, Hélio
Martins, Fátima
Jorge, Lurdes
Sousa, Maria João
Rodrigues, Luciano
Choupina, Altino
Palavras-chave: Castanea sativa Mill.
Glucanase inhibitor proteins
Phytophthora cinnamomi
Issue Date: 2010
Citação: Belo, Hélio; Martins, Fátima; Jorge, Lurdes; Sousa, Maria João; Rodrigues, Luciano; Choupina, Altino (2010) - Expression analysis by RT-PCR of GIP gene from Phytophthora cinnamomi. In 9th Conference of the European Foundation for Plant Pathology. 6th Congress of the Sociedade Portuguesa de Fitopatologia. Évora
Resumo: Species of the genus Phytophthora secrete glucanase inhibitor proteins (GIPs) to inhibit the activity of enzymes involved in plant defense responses, including during plant infection process of Castanea sativa Mill by Phytophthora cinnamomi. GIPs show structural homology to the chymotrypsin class of serine proteases (SP) but lack proteolytic activity due to the absence of an intact catalytic triad and, thus, belong to a broader class of proteins called serine protease homologs (SPH) nonfunctional because one or more residues of the essential catalytic triad is absent (His-Asp-Ser). GIPs show high homology to the S1A subfamily of SP, however questions remain about the expression patterns and potential roles of different GIPs during pathogenesis and their possible interaction with host EGases in the plant apoplast. ORF of GIP gene from P. cinnamomi encodes a 269 aa protein. In order to understand its function, we proceeded to the heterologous expression in Pichia pastoris. The expression was studied during growth in different carbon sources and a time course of glucanase inhibitor protein production by RT-PCR was also performed. The major expression levels occurred at the medium with glucose as carbon source.
Arbitragem científica: yes
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