Rab5 GDP/GTP exchange factor

From Proteopedia

spinqualitylabelsall models Human rabex-5 (cyan) complex with rabaptin (green and deeppink) and phosphate ion (PDB code 4n3z). Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image Function Rab5 GDP/GTP exchange factor (Rabex5) is a guanine nucleotide exchange factor. Rabex5 stimulates nucleotide exchange on Rab5. Rabex can act as a ubiqiutin ligase. It forms a tight complex with rabaptin which augments its exchange activity. The rabex5-rabaptin complex is critical to endosomal fusion[1]. Structural highlights The forming a 3-helix bundle[2].

3D Structures of Rab5 GDP/GTP exchange factor

Updated on 04-August-2024

1txu – hRabex5 Vps9 domain 133-394 – human
4n3x – hRabex5 CC domain 626-672
2c7m, 2c7n – hRabex5 ubiquitin interacting motif 1-74 + ubiquitin
2ot3 – hRabex5 Vps9 domain + Ras-related protein Rab21
4n3z – hRabex5 5δ 132-455 + Rabaptin
4q9u – hRabex5 5δ (mutant) + Ras-related protein Rab5A
4n3y – hRabex5 CC domain + Rab GTPase-binding effector protein
2fid, 2fif – bRabex5 zinc finger and ubiquitin interacting motif + ubiquitin – bovine

References

1. ↑ Horiuchi H, Lippe R, McBride HM, Rubino M, Woodman P, Stenmark H, Rybin V, Wilm M, Ashman K, Mann M, Zerial M. A novel Rab5 GDP/GTP exchange factor complexed to Rabaptin-5 links nucleotide exchange to effector recruitment and function. Cell. 1997 Sep 19;90(6):1149-59. PMID:9323142
2. ↑ Horiuchi H, Lippe R, McBride HM, Rubino M, Woodman P, Stenmark H, Rybin V, Wilm M, Ashman K, Mann M, Zerial M. A novel Rab5 GDP/GTP exchange factor complexed to Rabaptin-5 links nucleotide exchange to effector recruitment and function. Cell. 1997 Sep 19;90(6):1149-59. PMID:9323142