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PMID:20017557

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Citation

Nordquist, KA, Dimitrova, YN, Brzovic, PS, Ridenour, WB, Munro, KA, Soss, SE, Caprioli, RM, Klevit, RE and Chazin, WJ (2010) Structural and functional characterization of the monomeric U-box domain from E4B. Biochemistry 49:347-55

Abstract

Substantial evidence has accumulated indicating a significant role for oligomerization in the function of E3 ubiquitin ligases. Among the many characterized E3 ligases, the yeast U-box protein Ufd2 and its mammalian homologue E4B appear to be unique in functioning as monomers. An E4B U-box domain construct (E4BU) has been subcloned, overexpressed in Escherichia coli, and purified, which enabled determination of a high-resolution NMR solution structure and detailed biophysical analysis. E4BU is a stable monomeric protein that folds into the same structure observed for other structurally characterized U-box domain homodimers. Multiple sequence alignment combined with comparative structural analysis reveals substitutions in the sequence that inhibit dimerization. The interaction between E4BU and the E2 conjugating enzyme UbcH5c has been mapped using NMR, and these data have been used to generate a structural model for the complex. The E2 binding site is found to be similar to that observed for dimeric U-box and RING domain E3 ligases. Despite the inability to dimerize, E4BU was found to be active in a standard autoubiquitination assay. The structure of E4BU and its ability to function as a monomer are discussed in light of the ubiquitous observation of U-box and RING domain oligomerization.

Links

PubMed PMC2806929 Online version:10.1021/bi901620v

Keywords

Amino Acid Sequence; Animals; Basic-Leucine Zipper Transcription Factors/chemistry; Basic-Leucine Zipper Transcription Factors/genetics; Gene Amplification; Magnetic Resonance Spectroscopy; Mice; Models, Molecular; Molecular Sequence Data; Protein Conformation; Sequence Alignment; Solutions; Stress, Mechanical; Ubiquitin/chemistry; Ubiquitin/metabolism; Ubiquitin-Protein Ligases/chemistry; Ubiquitin-Protein Ligases/isolation & purification; Ubiquitin-Protein Ligases/metabolism; Yeasts/genetics

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

HUMAN:UB2D3

enables

GO:0061631: ubiquitin conjugating enzyme activity

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

MOUSE:UBE4B

enables

GO:0034450: ubiquitin-ubiquitin ligase activity

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

MOUSE:UBE4B

enables

GO:0061630: ubiquitin protein ligase activity

ECO:0000314: direct assay evidence used in manual assertion

F

  • has_input:(MGI:MGI:1927086)

Seeded From UniProt

complete


See also

References

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