| First Author | Pan Z | Year | 2013 |
| Journal | Structure | Volume | 21 |
| Issue | 6 | Pages | 1007-17 |
| PubMed ID | 23665171 | Mgi Jnum | J:247410 |
| Mgi Id | MGI:5926522 | Doi | 10.1016/j.str.2013.04.005 |
| Citation | Pan Z, et al. (2013) An autoinhibited conformation of LGN reveals a distinct interaction mode between GoLoco motifs and TPR motifs. Structure 21(6):1007-17 |
| abstractText | LGN plays essential roles in asymmetric cell divisions via its N-terminal TPR-motif-mediated binding to mInsc and NuMA. This scaffolding activity requires the release of the autoinhibited conformation of LGN by binding of Galpha(i) to its C-terminal GoLoco (GL) motifs. The interaction between the GL and TPR motifs of LGN represents a distinct GL/target binding mode with an unknown mechanism. Here, we show that two consecutive GL motifs of LGN form a minimal TPR-motif-binding unit. GL12 and GL34 bind to TPR0-3 and TPR4-7, respectively. The crystal structure of a truncated LGN reveals that GL34 forms a pair of parallel alpha helices and binds to the concave surface of TPR4-7, thereby preventing LGN from binding to other targets. Importantly, the GLs bind to TPR motifs with a mode distinct from that observed in the GL/Galpha(i).GDP complexes. Our results also indicate that multiple and orphan GL motif proteins likely respond to G proteins with distinct mechanisms. |
