Structure of the Small Ubiquitin-like Modifier (SUMO)-interacting Motif of MBD1-containing Chromatin-associated Factor 1 Bound to SUMO-3

Post-translational modification by small ubiquitin-like modifier (SUMO) proteins has been implicated in the regulation of a variety of cellular events. The functions of sumoylation are often mediated by downstream effector proteins harboring SUMO-interacting motifs (SIMs) that are composed of a hydr...

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Veröffentlicht in:The Journal of biological chemistry 2008-12, Vol.283 (51), p.35966-35975
Hauptverfasser: Sekiyama, Naotaka, Ikegami, Takahisa, Yamane, Tsutomu, Ikeguchi, Mitsunori, Uchimura, Yasuhiro, Baba, Daichi, Ariyoshi, Mariko, Tochio, Hidehito, Saitoh, Hisato, Shirakawa, Masahiro
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Sprache:eng
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Zusammenfassung:Post-translational modification by small ubiquitin-like modifier (SUMO) proteins has been implicated in the regulation of a variety of cellular events. The functions of sumoylation are often mediated by downstream effector proteins harboring SUMO-interacting motifs (SIMs) that are composed of a hydrophobic core and a stretch of acidic residues. MBD1-containing chromatin-associated factor 1 (MCAF1), a transcription repressor, interacts with SUMO-2/3 and SUMO-1, with a preference for SUMO-2/3. We used NMR spectroscopy to solve the solution structure of the SIM of MCAF1 bound to SUMO-3. The hydrophobic core of the SIM forms a parallel β-sheet pairing with strand β2 of SUMO-3, whereas its C-terminal acidic stretch seems to mediate electrostatic interactions with a surface area formed by basic residues of SUMO-3. The significance of these electrostatic interactions was shown by mutations of both SUMO-3 and MCAF1. The present structural and biochemical data suggest that the acidic stretch of the SIM of MCAF1 plays an important role in the binding to SUMO-3.
ISSN:0021-9258
1083-351X
DOI:10.1074/jbc.M802528200