The vault is a ubiquitous and highly conserved ribonucleoprotein particle of approximately 13 mDa of unknown function [1]. This family corresponds to a repeated domain found in the amino terminal half of the major vault protein.

1: Structure of the vault, a ubiquitous celular component. Kong LB, Siva AC, Rome LH, Stewart PL Structure 1999;7:371-379. PMID:10196123

2: New features of vault architecture and dynamics revealed by novel refinement using the deformable elastic network approach. Casanas A, Querol-Audi J, Guerra P, Pous J, Tanaka H, Tsukihara T, Verdaguer N, Fita I; Acta Crystallogr D Biol Crystallogr. 2013;69:1054-1061. PMID:23695250