The N-terminal tetra-peptide (IPDE) short extension of the U-box motif in rice SPL11 E3 is essential for the interaction with E2 and ubiquitin-ligase activity

Hansol Bae, Woo Taek Kim

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11 Citations (Scopus)

Abstract

Rice (Oryza sativa L.) contains at least 77 U-box E3 ubiquitin (Ub)-ligases. Rice contains at least 48 E2 Ub-conjugating enzymes. The U-box motif in rice SPL11 E3 Ub-ligase is essential to bind to its E2 partners. The minimal binding domain of rice SPL11 U-box E3 to its E2 partners was examined. Rice, a monocot model plant, contains at least 77 U-box E3 ubiquitin (Ub)-ligases and 48 E2 Ub-conjugating enzymes. Here, we investigated the minimal binding domain of rice SPL11 U-box E3 to its E2 partners. Serial deletions and site-directed mutagenesis analyses indicated that, in addition to an intact U-box motif, the N-terminal tetra-peptide (IPDE) short extension of the U-box was essential for the interaction of SPL11 with E2s and Ub-ligase activity. The Ile and Pro residues at the -4 and -3 positions of the U-box, respectively, were crucial for this interaction. These results suggest that the N-terminal tetra-peptide extension of the U-box participates in the specific interaction of SPL11 E3 with E2s in a sequence-specific manner in rice.

Original languageEnglish
Pages (from-to)266-271
Number of pages6
JournalBiochemical and Biophysical Research Communications
Volume433
Issue number2
DOIs
Publication statusPublished - 2013 Jan 1

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Ubiquitin-Protein Ligases
Ligases
Ubiquitin
Ubiquitin-Conjugating Enzymes
Peptides
Mutagenesis
Oryza
Site-Directed Mutagenesis

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

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abstract = "Rice (Oryza sativa L.) contains at least 77 U-box E3 ubiquitin (Ub)-ligases. Rice contains at least 48 E2 Ub-conjugating enzymes. The U-box motif in rice SPL11 E3 Ub-ligase is essential to bind to its E2 partners. The minimal binding domain of rice SPL11 U-box E3 to its E2 partners was examined. Rice, a monocot model plant, contains at least 77 U-box E3 ubiquitin (Ub)-ligases and 48 E2 Ub-conjugating enzymes. Here, we investigated the minimal binding domain of rice SPL11 U-box E3 to its E2 partners. Serial deletions and site-directed mutagenesis analyses indicated that, in addition to an intact U-box motif, the N-terminal tetra-peptide (IPDE) short extension of the U-box was essential for the interaction of SPL11 with E2s and Ub-ligase activity. The Ile and Pro residues at the -4 and -3 positions of the U-box, respectively, were crucial for this interaction. These results suggest that the N-terminal tetra-peptide extension of the U-box participates in the specific interaction of SPL11 E3 with E2s in a sequence-specific manner in rice.",
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AB - Rice (Oryza sativa L.) contains at least 77 U-box E3 ubiquitin (Ub)-ligases. Rice contains at least 48 E2 Ub-conjugating enzymes. The U-box motif in rice SPL11 E3 Ub-ligase is essential to bind to its E2 partners. The minimal binding domain of rice SPL11 U-box E3 to its E2 partners was examined. Rice, a monocot model plant, contains at least 77 U-box E3 ubiquitin (Ub)-ligases and 48 E2 Ub-conjugating enzymes. Here, we investigated the minimal binding domain of rice SPL11 U-box E3 to its E2 partners. Serial deletions and site-directed mutagenesis analyses indicated that, in addition to an intact U-box motif, the N-terminal tetra-peptide (IPDE) short extension of the U-box was essential for the interaction of SPL11 with E2s and Ub-ligase activity. The Ile and Pro residues at the -4 and -3 positions of the U-box, respectively, were crucial for this interaction. These results suggest that the N-terminal tetra-peptide extension of the U-box participates in the specific interaction of SPL11 E3 with E2s in a sequence-specific manner in rice.

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