GTPase activity of a bacterial SRP-like complex.
We have recently identified a protein (SRPM54) in Mycoplasma mycoides homologous to SRP54, a subunit of the mammalian signal recognition particle (SRP). This protein forms a complex with a mycoplasma RNA related to the RNA component of SRP. We have now demonstrated that the protein has an intrinsic GTPase activity in vitro and kinetic parameters for the enzymatic reaction have been determined. The GTPase activity was not significantly affected by the presence of the mycoplasma SRP RNA. Different regions of the SRPM54 protein were expressed as recombinant proteins in E. coli and were purified to near homogeneity. On the basis of the properties of these SRPM54 fragments two different functional domains of the protein could be distinguished. An N-terminal part was found to contain the GTPase activity and this domain had approximately the same kinetic properties as the full-length protein. Another domain corresponding to a C-terminal fragment contained the RNA binding activity as shown using an assay based on the retention of RNA-protein complexes to nitrocellulose filters.
Department of Medical Biochemistry, University of Göteborg, Sweden.
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Samuelsson
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Olsson
D001426:Bacterial Proteins / Q000302:isolation & purification / Q000378:metabolism*; D001483:Base Sequence; D020558:GTP Phosphohydrolases / Q000378:metabolism*; D008969:Molecular Sequence Data; D009176:Mycoplasma mycoides / Q000201:enzymology*; D016601:RNA-Binding Proteins / Q000378:metabolism; D011994:Recombinant Proteins / Q000302:isolation & purification / Q000378:metabolism; D012261:Ribonucleoproteins / Q000302:isolation & purification / Q000378:metabolism / Q000502:physiology*; D018271:Signal Recognition Particle; D013329:Structure-Activity Relationship
D001426:Bacterial Proteins; D016601:RNA-Binding Proteins; D011994:Recombinant Proteins; D012261:Ribonucleoproteins; D018271:Signal Recognition Particle; D020558:GTP Phosphohydrolases