Xenopus laevis actin-depolymerizing factor/cofilin: a phosphorylation- regulated protein essential for development

doi:10.1083/jcb.132.5.871

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Xenopus laevis actin-depolymerizing factor/cofilin: a phosphorylation- regulated protein essential for development

H Abe, T Obinata, LS Minamide and JR Bamburg
Department of Biology, Chiba University, Japan.

Two cDNAs, isolated from a Xenopus laevis embryonic library, encode proteins of 168 amino acids, both of which are 77% identical to chick cofilin and 66% identical to chick actin-depolymerizing factor (ADF), two structurally and functionally related proteins. These Xenopus ADF/cofilins (XADs) differ from each other in 12 residues spread throughout the sequence but do not differ in charge. Purified GST- fusion proteins have pH-dependent actin-depolymerizing and F-actin- binding activities similar to chick ADF and cofilin. Similarities in the developmental and tissue specific expression, embryonic localization, and in the cDNA sequence of the noncoding regions, suggest that the two XACs arise from allelic variants of the pseudotetraploid X. laevis. Immunofluorescence localization of XAC in oocyte sections with an XAC-specific monoclonal antibody shows it to be diffuse in the cortical cytoplasm. After fertilization, increased immunostaining is observed in two regions: along the membrane, particularly that of the vegetal hemisphere, and at the interface between the cortical and animal hemisphere cytoplasm. The cleavage furrow and the mid-body structure are stained at the end of first cleavage. Neuroectoderm derived tissues, notochord, somites, and epidermis stain heavily either continuously or transiently from stages 18-34. A phosphorylated form of XAC (pXAC) was identified by 2D Western blotting, and it is the only species found in oocytes. Dephosphorylation of >60% of the pXAC occurs within 30 min after fertilization. Injection of one blastomere at the 2 cell stage, either with constitutively active XAC or with an XAC inhibitory antibody, blocked cleavage of only the injected blastomere in a concentration- dependent manner without inhibiting nuclear division. The cleavage furrow of eggs injected with constitutively active XAC completely regressed. Blastomeres injected with neutralized antibody developed normally. These results suggest that XAC is necessary for cytokinesis and that its activity must be properly regulated for cleavage to occur.
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