| Description | This family includes the GTP-binding protein BipA or TypA (Tyrosine phosphorylated protein A (TypA), also known as 50S ribosomal subunit assembly factor BipA) from bacteria and its homologue from Arabidopsis (putative elongation factor TypA-like SVR3). BipA is a 50S ribosomal subunit assembly protein with GTPase activity, required for 50S subunit assembly at low temperatures, also functions as a translation factor that is required specifically for the expression of the transcriptional modulator Fis. BipA binds the 70S ribosome at a site that coincides with that of EF-G and has a GTPase activity that is sensitive to high GDP:GTP ratios and is stimulated by 70S ribosomes programmed with mRNA and aminoacylated tRNAs [, ]. The growth rate-dependent induction of BipA allows the efficient expression of Fis, thereby modulating a range of downstream processes, including DNA metabolism and type III secretion. This GTPase impacts interactions between enteropathogenic E.coli (EPEC) and epithelial cells and also has an effect on motility []. It appears to be involved in the regulation of several processes important for infection, including rearrangements of the cytoskeleton of the host, bacterial resistance to host defence peptides, flagellum-mediated cell motility, and expression of K5 capsular genes [, ].TypA-like SVR3 is a putative chloroplastic elongation factor involved in response to chilling stress. It is required for proper chloroplast rRNA processing and/or translation at low temperature [ ] and it is also involved in plastid protein homeostasis []. | Name | GTP-binding protein BipA |
| Short Name | BipA | Type | Family |
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