All articles starting with R
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RNA polymerase III
RNA polymerase III, or Pol III, is one of the three major eukaryotic nuclear RNA polymerases, making about 15% of cellular RNA in growing cells, including tRNA and 5S rRNA.
RNA polymerase inhibitor
An RNA polymerase inhibitor is a molecule that blocks transcription by binding RNA polymerase; rifamycins and fidaxomicin treat bacterial infections, while alpha-amanitin poisons human cells.
RNA polymerase sigma factor 54
RNA polymerase sigma factor 54 (σ54, σN, RpoN) is a 54 kDa bacterial sigma factor recognizing −24/−12 promoters; unlike σ70 it needs AAA+ enhancer-binding protein ATPases to open DNA.
RNA polymerase-binding transcription factor DksA
DksA (DnaK suppressor protein, dksA) is a 151-amino-acid E. coli transcription factor that binds RNA polymerase's secondary channel, not DNA, and with ppGpp represses rRNA promoters up to 20-fold while activating amino acid biosynthesis promoters during the stringent response.
RNA recognition motif
RNA recognition motif (RRM), also called RBD or RNP domain: an 80–90 amino acid RNA-binding protein domain with RNP1/RNP2 motifs on a four-stranded beta-sheet, the most abundant RNA-binding domain in vertebrates.
RNA silencing suppressor p19
p19 is a 19-kDa tombusvirus protein (TBSV, CymRSV, CIRV) that suppresses plant antiviral RNA silencing by sequestering 21-nt siRNA duplexes as a homodimeric molecular caliper, blocking RISC assembly.
RNA splicing
RNA splicing removes introns from pre-mRNA and joins exons to make mature mRNA, mainly via the spliceosome (U1-U6 snRNAs plus >50 proteins). Discovered as split genes by Sharp and Roberts in 1977; over 95% of human multi-exon genes are alternatively spliced.
RNA Stability
RNA stability: how long mRNA resists degradation, in cells (bacterial half-lives of minutes, eukaryotic hours, ARE-mediated decay) and as medicines (frozen mRNA-LNP vaccines, cold-chain limits, stabilization strategies).
RNA structure prediction
RNA structure prediction is the computational task of inferring an RNA molecule's folded structure from its sequence, usually as base-pair secondary structure and increasingly as full-atom 3D models.
RNA virus
RNA virus: virus with an RNA genome replicating via RNA-dependent RNA polymerase; Baltimore groups III, IV, V (retroviruses separate). Mutation rates 10^-6 to 10^-3 per nucleotide per replication, far above DNA viruses; includes influenza, polio, Ebola, SARS-CoV-2.
RNA world
RNA world hypothesis: RNA as both gene and enzyme before DNA and proteins; proposed 1960s (Woese, Crick, Orgel), named by Gilbert 1986; supported by ribozymes and ribosome, challenged by RNA instability and alternatives.
RNA-based pesticide
RNA-based pesticide: dsRNA/siRNA crop-protection products using RNA interference. Also SIGS or environmental RNAi. First sprayable product Calantha (ledprona) EPA-registered 2023 for Colorado potato beetle; HIGS maize MON87411 approved 2017.
RNA-binding motif
RNA-binding motif: chiefly the RNA recognition motif (RRM, RBD, RNP), an 80-100 amino acid protein domain, the most abundant RNA-binding domain in higher vertebrates; also the RBM protein family and RNA sequence motifs recognized by RNA-binding proteins.
RNA-binding protein
RNA-binding proteins (RBPs) are proteins that bind RNA to regulate splicing, stability, localization, and translation; about 1,600 human RBPs (roughly 7.5% of protein-coding genes) carry domains such as RRM and KH, and are mapped by CLIP-seq and computational prediction.
RNA-binding protein FUS
FUS (fused in sarcoma), historically TLS, is an RNA-binding protein regulating transcription, RNA processing, and DNA repair; gene fusions drive liposarcoma, and mutations cause familial ALS.
RNA-dependent RNA polymerase
An RNA-dependent RNA polymerase (RdRp), or RNA replicase, is an enzyme that copies RNA from an RNA template. Viral RdRps replicate and transcribe RNA virus genomes.
RNA-directed DNA methylation
RNA-directed DNA methylation (RdDM) is a plant-specific epigenetic pathway in which small interfering RNAs guide repressive DNA methylation, silencing transposons and repeats; it was discovered in viroid-infected tobacco.
RNA-guided DNA endonuclease domain-containing protein
RNA-guided DNA endonuclease domain-containing proteins, the guided_TnpB family, are transposon-encoded programmable nucleases (TnpB, IscB, OMEGA systems, Fanzors/HERMES) with RuvC-like domains and ωRNA guides, ancestors of Cas9 and Cas12 and compact genome-editing tools.
RNA-induced silencing complex
RNA-induced silencing complex (RISC): ribonucleoprotein effector of RNA interference, minimally one Argonaute protein plus a 20-30 nt guide RNA (siRNA, miRNA, or piRNA); human AGO2 is the only slicer, and GW182 mediates slicer-independent silencing.
RNA-Seq
RNA-seq (RNA sequencing) is a transcriptome-wide method that converts isolated RNA into cDNA and sequences it to measure gene expression; variants include scRNA-seq, long-read RNA-seq, and clinical applications.
RNAi as antiviral immunity
RNAi as antiviral immunity describes how RNA interference acts as a sequence-specific antiviral immune system in fungi, plants, and invertebrates, where viral RNA is cut into siRNAs that guide its destruction.
RNAi screening
RNAi screening is a functional genomics method that uses RNA interference to reduce gene expression one at a time or in pools, identifying genes behind a phenotype.
RNAi Therapeutics
RNAi therapeutics are siRNA drugs that silence disease genes via the RISC/Argonaute pathway; first FDA approval was patisiran (2018), with seven approved siRNAs delivered by lipid nanoparticles or GalNAc conjugates.
RNAIII
RNAIII is the 514-nucleotide dual-function regulatory RNA of the Staphylococcus aureus agr quorum-sensing system; it encodes delta-hemolysin and represses surface-protein mRNAs while activating toxin genes, driving the switch from colonization to toxin production.
RNAS Lee-on-Solent (HMS Daedalus)
RNAS Lee-on-Solent, also known as HMS Daedalus, was a Royal Navy air station at Lee-on-the-Solent, Hampshire, from 1917 to 1996, and the Fleet Air Arm's spiritual home.
RNAS Yeovilton (HMS Heron)
RNAS Yeovilton, or HMS Heron, is a Royal Naval Air Station in Somerset, England, home to the Fleet Air Arm's Wildcat and commando helicopter forces since 1940.
RnBoi
RnBoi (Samy Fahli / Samy Schmitt Fahli), French R&B singer-rapper born 2006 in Fontainebleau, raised in Nemours; first artist signed to Aya Nakamura's label; known for "Mon Bébé" (SNEP No. 2) and EP My Eyes Only.
RND-like transporter, transmembrane domain
RND-like transporter, transmembrane domain (InterPro IPR004869, Pfam MMPL PF03176) is the conserved 12-helix membrane domain of RND efflux pumps, duplicated in each transporter half and housing the proton relay that powers multidrug export.
RNF2
RNF2, also known as RING1B or RING2, is a protein-coding gene on human chromosome 1 encoding an E3 ubiquitin ligase that monoubiquitinates histone H2A within Polycomb repressive complex 1.
RNF213
RNF213 (ring finger protein 213, mysterin), gene at 17q25.3, encodes the largest human E3 ubiquitin ligase (591 kDa, RING plus AAA+ ATPase domains); its East Asian p.R4810K founder variant is the major susceptibility factor for moyamoya disease and related vasculopathies.