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Title: Distinct roles of protein disulfide isomerase and P5 sulfhydryl oxidoreductases in multiple pathways for oxidation of structurally diverse storage proteins in rice .
Author: Onda Y Nagamine A Sakurai M Kumamaru T Ogawa M Kawagoe Y
Journal: Plant Cell Citation: V : 23 P : 210-23 Year: 2011 Type: MEDLINE
Literature: oryza Field: abstract Doc ID: pub21278127 Accession (PMID): 21278127
Abstract: In the rice ( Oryza sativa ) endosperm , storage proteins are synthesized on the rough endoplasmic reticulum ( ER ) , in which prolamins are sorted to protein bodies ( PBs ) called type-I PB ( PB-I ) . Protein disulfide isomerase ( PDI ) family oxidoreductase PDIL2 ; 3 , an ortholog of human P5 , contains a conserved structural disulfide in the redox-inactive thioredoxin-like ( TRX ) domain and was efficiently targeted to the surface of PB-I in a redox active site-dependent manner , whereas PDIL1 ; 1 , an ortholog of human PDI , was localized in the ER lumen . Complementation analyses using PDIL1 ; 1 knockout esp2 mutant indicated that the a and a TRX domains of PDIL1 ; 1 exhibited similar redox activities and that PDIL2 ; 3 was unable to perform the PDIL1 ; 1 functions . PDIL2 ; 3 knockdown inhibited the accumulation of Cys-rich 10-kD prolamin ( crP10 ) in the core of PB-I Conversely , crP10 knockdown dispersed PDIL2 ; 3 into the ER lumen . Glutathione S-transferase-PDIL2 ; 3 formed a stable tetramer when it was expressed in Escherichia coli , and the recombinant PDIL2 ; 3 tetramer facilitated alpha-globulin ( C79F ) mutant protein to form nonnative intermolecular disulfide bonds in vitro . These results indicate that PDIL2 ; 3 and PDIL1 ; 1 are not functionally redundant in sulfhydryl oxidations of structurally diverse storage proteins and play distinct roles in PB development . We discuss PDIL2 ; 3-dependent and PDIL2 ; 3-independent oxidation pathways that sustain disulfide bonds of crP10 in PB-I
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[ Sen. 4, subscore: 2.00 ]: PDIL2 ; 3 knockdown inhibited the accumulation of Cys-rich 10-kD prolamin ( crP10 ) in the core of PB-I Conversely , crP10 knockdown dispersed PDIL2 ; 3 into the ER lumen .
[ Sen. 7, subscore: 1.00 ]: We discuss PDIL2 ; 3-dependent and PDIL2 ; 3-independent oxidation pathways that sustain disulfide bonds of crP10 in PB-I
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