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- W2058615706 abstract "Ubiquitin pathway E3 ligases are an important component conferring specificity and regulation in ubiquitin attachment to substrate proteins. The Arabidopsis thaliana RING (Really Interesting New Gene) domain-containing proteins BRIZ1 and BRIZ2 are essential for normal seed germination and post-germination growth. Loss of either BRIZ1 (At2g42160) or BRIZ2 (At2g26000) results in a severe phenotype. Heterozygous parents produce progeny that segregate 3:1 for wild-type:growth-arrested seedlings. Homozygous T-DNA insertion lines are recovered for BRIZ1 and BRIZ2 after introduction of a transgene containing the respective coding sequence, demonstrating that disruption of BRIZ1 or BRIZ2 in the T-DNA insertion lines is responsible for the observed phenotype. Both proteins have multiple predicted domains in addition to the RING domain as follows: a BRAP2 (BRCA1-Associated Protein 2), a ZnF UBP (Zinc Finger Ubiquitin Binding protein), and a coiled-coil domain. In vitro, both BRIZ1 and BRIZ2 are active as E3 ligases but only BRIZ2 binds ubiquitin. In vitro synthesized and purified recombinant BRIZ1 and BRIZ2 preferentially form hetero-oligomers rather than homo-oligomers, and the coiled-coil domain is necessary and sufficient for this interaction. BRIZ1 and BRIZ2 co-purify after expression in tobacco leaves, which also requires the coiled-coil domain. BRIZ1 and BRIZ2 coding regions with substitutions in the RING domain are inactive in vitro and, after introduction, fail to complement their respective mutant lines. In our current model, BRIZ1 and BRIZ2 together are required for formation of a functional ubiquitin E3 ligase in vivo, and this complex is required for germination and early seedling growth. Ubiquitin pathway E3 ligases are an important component conferring specificity and regulation in ubiquitin attachment to substrate proteins. The Arabidopsis thaliana RING (Really Interesting New Gene) domain-containing proteins BRIZ1 and BRIZ2 are essential for normal seed germination and post-germination growth. Loss of either BRIZ1 (At2g42160) or BRIZ2 (At2g26000) results in a severe phenotype. Heterozygous parents produce progeny that segregate 3:1 for wild-type:growth-arrested seedlings. Homozygous T-DNA insertion lines are recovered for BRIZ1 and BRIZ2 after introduction of a transgene containing the respective coding sequence, demonstrating that disruption of BRIZ1 or BRIZ2 in the T-DNA insertion lines is responsible for the observed phenotype. Both proteins have multiple predicted domains in addition to the RING domain as follows: a BRAP2 (BRCA1-Associated Protein 2), a ZnF UBP (Zinc Finger Ubiquitin Binding protein), and a coiled-coil domain. In vitro, both BRIZ1 and BRIZ2 are active as E3 ligases but only BRIZ2 binds ubiquitin. In vitro synthesized and purified recombinant BRIZ1 and BRIZ2 preferentially form hetero-oligomers rather than homo-oligomers, and the coiled-coil domain is necessary and sufficient for this interaction. BRIZ1 and BRIZ2 co-purify after expression in tobacco leaves, which also requires the coiled-coil domain. BRIZ1 and BRIZ2 coding regions with substitutions in the RING domain are inactive in vitro and, after introduction, fail to complement their respective mutant lines. In our current model, BRIZ1 and BRIZ2 together are required for formation of a functional ubiquitin E3 ligase in vivo, and this complex is required for germination and early seedling growth." @default.
- W2058615706 created "2016-06-24" @default.
- W2058615706 creator A5009219329 @default.
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- W2058615706 date "2010-11-01" @default.
- W2058615706 modified "2023-09-27" @default.
- W2058615706 title "BRIZ1 and BRIZ2 Proteins Form a Heteromeric E3 Ligase Complex Required for Seed Germination and Post-germination Growth in Arabidopsis thaliana" @default.
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- W2058615706 doi "https://doi.org/10.1074/jbc.m110.168021" @default.
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