Function of heterologous and truncated RNase P proteins in Bacillus subtilis.
Bacterial RNase P is composed of an RNA subunit and a single protein (encoded by the rnpB and rnpA genes respectively). The Bacillus subtilis rnpA knockdown strain d7 was used to screen for functional conservation among bacterial RNase P proteins from a representative spectrum of bacterial subphyla. We demonstrate conserved function of bacterial RNase P (RnpA) proteins despite low sequence conservation. Even rnpA genes from psychrophilic and thermophilic bacteria rescued growth of B. subtilis d7 bacteria; likewise, terminal extensions and insertions between beta strands 2 and 3, in the so-called metal binding loop, were compatible with RnpA function in B. subtilis. A deletion analysis of B. subtilis RnpA defined the structural elements essential for bacterial RNase P function in vivo. We further extended our complementation analysis in B. subtilis strain d7 to the four individual RNase P protein subunits from three different Archaea, as well as to human Rpp21 and Rpp29 as representatives of eukaryal RNase P. None of these non-bacterial RNase P proteins showed any evidence of being able to replace the B. subtilis RNase P protein in vivo, supporting the notion that archaeal/eukaryal RNase P proteins are evolutionary unrelated to the bacterial RnpA protein.
Gösringer
Markus
M
Institut für Pharmazeutische Chemie, Philipps-Universität Marburg, Marbacher Weg 6, D-35037 Marburg, Germany.
Hartmann
Roland K
RK
D000595:Amino Acid Sequence; D001412:Bacillus subtilis / Q000201:enzymology* / Q000235:genetics; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D015153:Blotting, Western; D019143:Evolution, Molecular; D005816:Genetic Complementation Test; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009154:Mutation; D010802:Phylogeny; D017433:Protein Structure, Secondary; D043262:Ribonuclease P / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D017384:Sequence Deletion
D001426:Bacterial Proteins; D043262:Ribonuclease P