Biology subjects

Weitzer, S.

Publications and source records attributed to Weitzer, S..

3 recordsLinked to original sources

bioRxiv2026

Myopathy-causing variants of PYROXD1 converge on impaired RNA ligation

RNA ligation is critical for RNA processing pathways including pre-tRNA splicing. RTCB is the only essential RNA ligase in humans and the catalytic subunit of the tRNA ligase complex (tRNA-LC). Its active site is sensitive to oxidation and strictly depends on oxidoreductase PYROXD1, the only tRNA-LC subunit with multiple known pathogenic protein-coding variants. The role of RNA ligation in PYROXD1 myopathy remained contentious: loss of PYROXD1 primarily affects mitochondria, and ligation-linked readouts are inconsistent in existing assays. Here, we reveal that PYROXD1 is physically, genetically and functionally committed to the tRNA-LC. Selectively impairing RTCB activation reproduces hallmarks of PYROXD1 dysfunction, including mitochondrial deregulation. Using degron-based depletion of endogenous PYROXD1, we show that all six single amino acid variants reported in patients fail to sustain RNA ligation in proportion to their clinical severity. The variants segregate into three mechanistic classes: they lower protein stability, disrupt the NADPH-mediated conformational switch, or impair RTCB engagement by the C-terminal tail, a sequence unique to PYROXD1 and directly affected in the most severe variant D500N. Variant-level measurements in the degron model predict outcomes in homozygous and compound heterozygous patient fibroblasts. Together, these data establish impaired RNA ligation as the driver of PYROXD1 pathogenicity.

biochemistry↗

bioRxiv2021

Molecular architecture of the human tRNA ligase complex

RtcB enzymes are RNA ligases that play essential roles in tRNA splicing, unfolded protein response, and RNA repair. In metazoa, RtcB functions as part of a five-subunit tRNA ligase complex (tRNA-LC) along with Ddx1, Cgi-99, Fam98B and Ashwin. The human tRNA-LC or its individual subunits have been implicated in additional cellular processes including microRNA maturation, viral replication, DNA double-strand break repair and mRNA transport. Here we present a biochemical analysis of the inter-subunit interactions within the human tRNA-LC along with crystal structures of the catalytic subunit RTCB and the N-terminal domain of CGI-99. We show that the core of the human tRNA-LC is assembled from RTCB and the C-terminal alpha-helical regions of DDX1, CGI-99, and FAM98B, all of which are required for complex integrity. The N-terminal domain of CGI-99 displays structural homology to calponin-homology domains, and CGI-99 and FAM98B associate via their N-terminal domains to form a stable subcomplex. The crystal structure of GMP-bound RTCB reveals divalent metal coordination geometry in the active site, providing insights into its catalytic mechanism. Collectively, these findings shed light on the molecular architecture and mechanism of the human tRNA ligase complex, and provide a structural framework for understanding its functions in cellular RNA metabolism.

biochemistry↗

bioRxiv2020

Assembly defects of the human tRNA splicing endonuclease contribute to impaired pre-tRNA processing in pontocerebellar hypoplasia

Introns of human transfer RNA precursors (pre-tRNAs) are excised by the tRNA splicing endonuclease TSEN in complex with the RNA kinase CLP1. Mutations in TSEN/CLP1 occur in patients with pontocerebellar hypoplasia (PCH), however, their role in the disease is unclear. Here, we show that intron excision is catalyzed by tetrameric TSEN assembled from inactive heterodimers independently of CLP1. Splice site recognition involves the mature domain and the anticodon-intron base pair of pre-tRNAs. The 2.1-[A] resolution X-ray crystal structure of a TSEN15-34 heterodimer and differential scanning fluorimetry analyses show that PCH mutations cause thermal destabilization. While endonuclease activity in recombinant mutant TSEN is unaltered, we observe assembly defects and reduced pre-tRNA cleavage activity resulting in an imbalanced pre-tRNA pool in PCH patient-derived fibroblasts. Our work defines the molecular principles of intron excision in humans and provides evidence that modulation of TSEN stability may contribute to PCH phenotypes.

biochemistry↗