Structure and expression of Xenopus karyopherin-beta 3: definition of a novel synexpression group related to ribosome biogenesis

Karyopherin-beta 3 is a nuclear transport receptor that appears to be involved in nuclear import of ribosomal proteins. Here we report on sequence and expression of karyopherin-beta 3 in Xenopus. The differential distribution of karyopherin-beta 3 mRNA during Xenopus embryogenesis is similar to that of several other protein import factors and of ribosomal proteins. These genes thus define a novel synexpression group in the context of ribosome biogenesis. (C) 2000 Elsevier Science Ireland Ltd. All rights reserved.