Nebulin: a study of protein repeat evolution

Journal of Molecular Biology
Asa K BjörklundArne Elofsson

Abstract

Protein domain repeats are common in proteins that are central to the organization of a cell, in particular in eukaryotes. They are known to evolve through internal tandem duplications. However, the understanding of the underlying mechanisms is incomplete. To shed light on repeat expansion mechanisms, we have studied the evolution of the muscle protein Nebulin, a protein that contains a large number of actin-binding nebulin domains. Nebulin proteins have evolved from an invertebrate precursor containing two nebulin domains. Repeat regions have expanded through duplications of single domains, as well as duplications of a super repeat (SR) consisting of seven nebulins. We show that the SR has evolved independently into large regions in at least three instances: twice in the invertebrate Branchiostoma floridae and once in vertebrates. In-depth analysis reveals several recent tandem duplications in the Nebulin gene. The events involve both single-domain and multidomain SR units or several SR units. There are single events, but frequently the same unit is duplicated multiple times. For instance, an ancestor of human and chimpanzee underwent two tandem duplications. The duplication junction coincides with an Alu transposon, thus sugg...Continue Reading

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