PMID: 8603919Mar 1, 1996Paper

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

The Journal of Cell Biology
H AbeJ R Bamburg

Abstract

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...Continue Reading

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