Involved in development of tracheal vasculature. Probably involved in halting cell migration at the end of vascular tube outgrowth. Possesses E3 ubiquitin ligase activity when in complex with Elongin BC complex, Cul2 and Rox1a/Rbx1, and can target sima/Hif1a for ubiquitination. May play a critical role in promoting microtubule stabilization when tubulins are correctly folded by the prefoldin complex. If tubulin is incorrectly folded, may promote its degradation. Protein modification; protein ubiquitination. Part of a complex with Cul2, Roc1a/Rbx1 and the elongin BC complex. Interacts with sima/Hif1a. Interacts with itself. Interacts with mgr and betaTub56D/tubulin beta-1 chain. Interacts with tubulin alpha-beta heterodimers by itself or in complex with mgr. Interacts with microtubules (MTs). Expressed throughout development. During embryogenesis specifically expressed in developing tracheal regions. Belongs to the VHL family.