6k0a

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cryo-EM structure of an archaeal Ribonuclease P

Structural highlights

6k0a is a 12 chain structure with sequence from Methanocaldococcus jannaschii and Methanocaldococcus jannaschii DSM 2661. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Experimental data:Check to display Experimental Data
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

RNP2_METJA Part of ribonuclease P, a protein complex that generates mature tRNA molecules by cleaving their 5'-ends.[HAMAP-Rule:MF_00755][1] [2] [3]

Publication Abstract from PubMed

Ribonuclease P (RNase P) is an essential ribozyme responsible for tRNA 5' maturation. Here we report the cryo-EM structures of Methanocaldococcus jannaschii (Mja) RNase P holoenzyme alone and in complex with a tRNA substrate at resolutions of 4.6 A and 4.3 A, respectively. The structures reveal that the subunits of MjaRNase P are strung together to organize the holoenzyme in a dimeric conformation required for efficient catalysis. The structures also show that archaeal RNase P is a functional chimera of bacterial and eukaryal RNase Ps that possesses bacterial-like two RNA-based anchors and a eukaryal-like protein-aided stabilization mechanism. The 3'-RCCA sequence of tRNA, which is a key recognition element for bacterial RNase P, is dispensable for tRNA recognition by MjaRNase P. The overall organization of MjaRNase P, particularly within the active site, is similar to those of bacterial and eukaryal RNase Ps, suggesting a universal catalytic mechanism for all RNase Ps.

Cryo-electron microscopy structure of an archaeal ribonuclease P holoenzyme.,Wan F, Wang Q, Tan J, Tan M, Chen J, Shi S, Lan P, Wu J, Lei M Nat Commun. 2019 Jun 13;10(1):2617. doi: 10.1038/s41467-019-10496-3. PMID:31197137[4]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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See Also

References

  1. ↑ Pulukkunat DK, Gopalan V. Studies on Methanocaldococcus jannaschii RNase P reveal insights into the roles of RNA and protein cofactors in RNase P catalysis. Nucleic Acids Res. 2008 Jul;36(12):4172-80. doi: 10.1093/nar/gkn360. Epub 2008, Jun 16. PMID:18558617 doi:http://dx.doi.org/10.1093/nar/gkn360
  2. ↑ Chen WY, Xu Y, Cho IM, Oruganti SV, Foster MP, Gopalan V. Cooperative RNP assembly: complementary rescue of structural defects by protein and RNA subunits of archaeal RNase P. J Mol Biol. 2011 Aug 12;411(2):368-83. doi: 10.1016/j.jmb.2011.05.012. Epub 2011 , Jun 12. PMID:21683084 doi:http://dx.doi.org/10.1016/j.jmb.2011.05.012
  3. ↑ Chen WY, Singh D, Lai LB, Stiffler MA, Lai HD, Foster MP, Gopalan V. Fidelity of tRNA 5'-maturation: a possible basis for the functional dependence of archaeal and eukaryal RNase P on multiple protein cofactors. Nucleic Acids Res. 2012 May;40(10):4666-80. doi: 10.1093/nar/gks013. Epub 2012, Jan 31. PMID:22298511 doi:http://dx.doi.org/10.1093/nar/gks013
  4. ↑ Wan F, Wang Q, Tan J, Tan M, Chen J, Shi S, Lan P, Wu J, Lei M. Cryo-electron microscopy structure of an archaeal ribonuclease P holoenzyme. Nat Commun. 2019 Jun 13;10(1):2617. doi: 10.1038/s41467-019-10496-3. PMID:31197137 doi:http://dx.doi.org/10.1038/s41467-019-10496-3

Contents


6k0a, resolution 4.60Å

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