Author:
Havin Leora,Git Anna,Elisha Zichrini,Oberman Froma,Yaniv Karina,Schwartz Sigal Pressman,Standart Nancy,Yisraeli Joel K.
Abstract
Vg1 mRNA translocation to the vegetal cortex ofXenopus oocytes requires intact microtubules, and a 3′ UTRcis-acting element (termed VLE), which also mediates sequence-specific binding of several proteins. One protein, the 69-kD Vg1 RBP, associates Vg1 RNA to microtubules in vitro. Here we show that Vg1 RBP-binding sites correlate with vegetal localization. Purification and cloning of Vg1 RBP revealed five RNA-binding motifs: four KH and one RRM domains. Surprisingly, Vg1 RBP is highly homologous to the zipcode binding protein implicated in the microfilament-mediated localization of β actin mRNA in fibroblasts. These data support Vg1 RBP’s direct role in vegetal localization and suggest the existence of a general, evolutionarily conserved mechanism for mRNA targeting.
Publisher
Cold Spring Harbor Laboratory
Subject
Developmental Biology,Genetics
Cited by
188 articles.
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