RTCA

Last update 08 May 2025

Basic Info

Synonyms

RNA 3'-terminal phosphate cyclase, RNA cyclase, RNA terminal phosphate cyclase domain-containing protein 1

+ [7]

Introduction

Catalyzes the conversion of 3'-phosphate to a 2',3'-cyclic phosphodiester at the end of RNA (PubMed:9184239). The mechanism of action of the enzyme occurs in 3 steps: (A) adenylation of the enzyme by ATP; (B) transfer of adenylate to an RNA-N3'P to produce RNA-N3'PP5'A; (C) and attack of the adjacent 2'-hydroxyl on the 3'-phosphorus in the diester linkage to produce the cyclic end product (PubMed:9184239). Likely functions in some aspects of cellular RNA processing (PubMed:25961792, PubMed:9184239). Function plays an important role in regulating axon regeneration by inhibiting central nervous system (CNS) axon regeneration following optic nerve injury (PubMed:25961792).

100 Clinical Results associated with RTCA

100 Translational Medicine associated with RTCA

0 Patents (Medical) associated with RTCA

275

Literatures (Medical) associated with RTCA

23 Apr 2025·Applied and Environmental Microbiology

Deletion of Re -citrate synthase allows for analysis of contributions of tricarboxylic acid cycle directionality to the growth of Heliomicrobium modesticaldum

Article

Author: Redding, Kevin E. ; Layton, Alexandria M. ; McCauley, Christopher

ABSTRACTHeliomicrobium modesticaldum, a phototrophic member of the phylum Firmicutes and family Clostridiales, possesses most of the enzymes specific to the reductive tricarboxylic acid (rTCA) cycle, except for the key enzyme, ATP-citrate lyase. It is thought to utilize a split TCA cycle when growing on pyruvate as a carbon source, in which the oxidative TCA (oTCA) direction generates most of the 2-ketoglutarate, but some can be produced in the reductive direction. Although a typical Si -citrate synthase gene is not found in the genome, it was suggested that gene HM1_2993, annotated as homocitrate synthase, actually encodes Re -citrate synthase, which would function as the initial enzyme of the oTCA cycle. We deleted this gene to test this hypothesis and, if true, see what effect severing access to the oTCA cycle would have on this organism. The endogenous CRISPR-Cas system was used to replace the open reading frame with a selectable marker. The deletion mutants could grow on pyruvate but were unable to grow phototrophically on acetate + CO 2 as carbon source. Growth on acetate could be rescued by the addition of different electron sources (formate or ascorbate), suggesting that the oTCA cycle is used to oxidize acetate to generate electrons required to drive the carboxylation of acetyl-CoA. The deletion mutants were capable of growing in acetate minimal media without additional organic supplements beyond formate, demonstrating that the rTCA cycle can be employed to support sufficient 2-ketoglutarate production in this organism, unlike citrate synthase mutants in several chemoheterotrophic organisms utilizing the oTCA cycle. IMPORTANCEHeliobacteria are a unique group of phototrophic bacteria that are obligate anaerobes and possess a rudimentary system to use light as a source of energy. They do not make oxygen or fix carbon dioxide. Here, we explore their fundamental carbon metabolism to understand the role and operation of the central TCA cycle. This work shows both the role and operation of this cycle under different growth modes and explains how these organisms can obtain electrons to drive their biosynthetic metabolism. This foundational knowledge will be crucial in the future when attempts are made to use this organism as a platform for oxygen-sensitive synthesis of compounds in an anaerobe that can use light as its energy source.

21 Mar 2025·Investigative Ophthalmology & Visual Science

Pten Loss Triggers Progressive Photoreceptor Degeneration in an mTORC1-Independent Manner

Article

Author: Minamisono, Ren ; van Oosten, Edwin ; Schuurmans, Carol ; Aubert, Isabelle ; Mehta, Dhruv Nimesh ; Touahri, Yacine ; Vecchio, Laura M. ; David, Luke Ajay ; Hanna, Joseph ; Dixit, Rajiv ; Pak, Alissa

PurposeSilencing Phosphatase and tensin homolog (Pten) is a proposed therapeutic strategy for tissue regeneration to treat neurological disorders. However, Pten is pleiotropic, inhibiting several signaling and metabolic pathways, including mTORC1 and glycolysis, both pro-regenerative in certain contexts. This study aims to assess the long-term impact of inactivating Pten on photoreceptor survival in the retina and to identify downstream pathway(s).MethodsWe assessed retinal integrity in Pten conditional knock-outs (cKOs) that were retinal progenitor cell (RPC)-specific (Pten RPC-cKO), a congenital model, or rod-specific (Pten Rho-cKO). We examined early changes in photoreceptor gene expression and used immunostaining to assess photoreceptors, reactive astrocytes, microglia, angiogenesis, and subretinal deposit formation from postnatal day (P) 21 to 1 year of age. Pten RPC-cKO retinal explants were treated with rapamycin, an mTOR inhibitor, or 2-deoxy-D-glucose (2DG), a glycolysis inhibitor.ResultsIn both Pten-cKO models, retinas display signs of early pathogenesis as photoreceptor-specific gene expression is downregulated at P0, before photoreceptor loss. Pten loss triggers progressive rod and cone degeneration beginning at P21 in Pten RPC-cKOs and at 6 months of age in Pten Rho-cKOs. Activated microglia and astrocytes, and increased angiogenesis, are observed in both Pten-cKO models, while subretinal amyloid-β deposits develop in Pten RPC-cKOs. Rapamycin accelerates photoreceptor degeneration in Pten RPC-cKOs, whereas 2DG has no effect.ConclusionsOur findings suggest that Pten loss, either in RPCs as a congenital model, or solely in mature rod photoreceptors, leads to progressive retinal degeneration that is exacerbated by mTORC1 suppression, drawing into question the therapeutic value of Pten-mTORC1 manipulations.

10 Jan 2025·Angewandte Chemie International Edition

Nonenzymatic Hydration of Phosphoenolpyruvate: General Conditions for Hydration in Protometabolism by Searching Across Pathways

Article

Author: Moran, Joseph ; Bora Basar, Atalay ; Zimmermann, Joris

AbstractNumerous reactions within metabolic pathways have been reported to occur nonenzymatically, supporting the hypothesis that life arose upon a primitive nonenzymatic precursor to metabolism. However, most of those studies reproduce individual transformations or segments of pathways without providing a common set of conditions for classes of reactions that span multiple pathways. In this study, we search across pathways for common nonenzymatic conditions for a recurring chemical transformation in metabolism: alkene hydration. The mild conditions that we identify (Fe oxides such as green rust) apply to all hydration reactions of the rTCA cycle and gluconeogenesis, including the hydration of phosphoenolpyruvate (PEP) to 2‐phosphoglycerate (2PGA), which had not previously been reported under nonenzymatic conditions. Mechanistic insights were obtained by studying analogous substrates and through anoxic and radical trapping experiments. Searching for nonenzymatic conditions across pathways provides a complementary strategy to triangulate conditions conducive to the nonenzymatic emergence of a protometabolism.

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