The Alba protein family: Structure and function
2016
Goyal, Manish | Banerjee, Chinmoy | Nag, Shiladitya | Bandyopadhyay, Uday
Alba family proteins are small, basic, dimeric nucleic acid-binding proteins, which are widely distributed in archaea and a number of eukaryotes. This family of proteins bears the distinct features of regulation through acetylation/deacetylation, hence named as acetylation lowers binding affinity (Alba). Alba family proteins bind DNA cooperatively with no apparent sequence specificity. Besides DNA, Alba proteins also interact with diverse RNA species and associate with ribonucleo-protein complexes. Initially, Alba proteins were recognized as chromosomal proteins and supposed to be involved in the maintenance of chromatin architecture and transcription repression. However, recent studies have shown increasing evidence of functional plasticity among Alba family of proteins that widely range from genome packaging and organization, transcriptional and translational regulation, RNA metabolism, and development and differentiation processes. In recent years, Alba family proteins have attracted growing interest due to their widespread occurrence in large number of organisms. Presence in multiple copies, functional crosstalk, differential binding affinity, and posttranslational modifications are some of the key factors that might regulate the biological functions of Alba family proteins. In this review article, we present an overview of the Alba family proteins, their salient features and emphasize their functional role in different organisms reported so far.
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