6BV8

Structure of proteinaceous RNase P 1 (PRORP1) from A. thaliana complexed with Mn after 3-hour soak with juglone


ChainDomainClassArchitectureTopologyHomology
A1.25.40.10 Mainly Alpha Alpha Horseshoe Serine Threonine Protein Phosphatase 5, Tetratricopeptide repeat Tetratricopeptide repeat domain
A1.25.40.10 Mainly Alpha Alpha Horseshoe Serine Threonine Protein Phosphatase 5, Tetratricopeptide repeat Tetratricopeptide repeat domain
A3.40.50.11980 Alpha Beta 3-Layer(aba) Sandwich Rossmann fold

Protein Family Annotation Pfam Database Homepage

ChainsAccessionIdentifierDescriptionCommentsSource
APF17177Pentacotripeptide-repeat region of PRORP (PPR_long)Pentacotripeptide-repeat region of PRORPPentatricopeptide repeat (PPR) proteins are a large family of modular RNA-binding proteins which mediate several aspects of gene expression primarily in organelles but also in the nucleus [1]. PPR_long is the region of Arabidopsis protein-only RNase ...Pentatricopeptide repeat (PPR) proteins are a large family of modular RNA-binding proteins which mediate several aspects of gene expression primarily in organelles but also in the nucleus [1]. PPR_long is the region of Arabidopsis protein-only RNase P (PRORP) enzyme that consists of up to eleven alpha-helices [2]. PRORPs are a class of RNA processing enzymes that catalyze maturation of the 5' end of precursor tRNAs in Eukaryotes [3]. All PPR proteins contain tandemly repeated sequence motifs (the PPR motifs) which can vary in number. The series of helix-turn-helix motifs formed by PPR motifs throughout the protein produces a superheros with a central groove that allows the protein to bind RNA [1]. Proteins containing PPR motifs are known to have roles in transcription, RNA processing, splicing, stability, editing, and translation. Over a decade after the discovery of PPR proteins, the super-helical structure was confirmed. The protein-only mitochondrial RNase P crystal structure from Arabidopsis thaliana (PRORP1) confirmed the role of its PPR motifs in pre-tRNA binding and suggest it has evolved independently from other RNase P proteins that rely on catalytic RNA [1].
Domain
APF16953Protein-only RNase P (PRORP)Protein-only RNase PPRORPs (protein-only RNase P) are a class of RNA processing enzymes that catalyze maturation of the 5' end of precursor tRNAs in Eukaryotes [1]. Arabidopsis thaliana contains PRORP enzymes (PRORP1, PRORP2 and PRORP3) where PRORP1 localizes to mitocho ...PRORPs (protein-only RNase P) are a class of RNA processing enzymes that catalyze maturation of the 5' end of precursor tRNAs in Eukaryotes [1]. Arabidopsis thaliana contains PRORP enzymes (PRORP1, PRORP2 and PRORP3) where PRORP1 localizes to mitochondria as well as chloroplasts, while PRORP2 and PRORP3 are found in the nucleus. In humans and most other metazoans, mt-RNase P is composed of three protein subunits (mitochondrial RNase P proteins 1-3; MRPP1-3), homologs to the Arabidopsis thaliana PRORP1-3. This domain corresponds to the metallonuclease domain of PRORPs. PRORP1 has 22% sequence identity to the human homologue MRPP3. PRORP1 crystal structure shows a V-shaped tripartite structure with a C-terminal metallonuclease domain of the NYN (N4BL1, YacP-like nuclease) family, with a typical and functional two-metal-ion catalytic site that has conserved aspartate residues [2].
Domain