7xny
From Proteopedia
High resolution cry-EM structure of the human 80S ribosome from SNORD127+/- Kasumi-1 cells
Structural highlights
DiseaseRL35A_HUMAN Blackfan-Diamond disease. Diamond-Blackfan anemia 5 (DBA5) [MIM:612528: A form of Diamond-Blackfan anemia, a congenital non-regenerative hypoplastic anemia that usually presents early in infancy. Diamond-Blackfan anemia is characterized by a moderate to severe macrocytic anemia, erythroblastopenia, and an increased risk of malignancy. 30 to 40% of Diamond-Blackfan anemia patients present with short stature and congenital anomalies, the most frequent being craniofacial (Pierre-Robin syndrome and cleft palate), thumb and urogenital anomalies. Note=The disease is caused by mutations affecting the gene represented in this entry.[1] FunctionRL35A_HUMAN Required for the proliferation and viability of hematopoietic cells. Plays a role in 60S ribosomal subunit formation. The protein was found to bind to both initiator and elongator tRNAs and consequently was assigned to the P site or P and A site.[2] Publication Abstract from PubMedThe development and regulation of malignant self-renewal remain unresolved issues. Here, we provide biochemical, genetic, and functional evidence that dynamics in ribosomal RNA (rRNA) 2'-O-methylation regulate leukemia stem cell (LSC) activity in vivo. A comprehensive analysis of the rRNA 2'-O-methylation landscape of 94 patients with acute myeloid leukemia (AML) revealed dynamic 2'-O-methylation specifically at exterior sites of ribosomes. The rRNA 2'-O-methylation pattern is closely associated with AML development stage and LSC gene expression signature. Forced expression of the 2'-O-methyltransferase fibrillarin (FBL) induced an AML stem cell phenotype and enabled engraftment of non-LSC leukemia cells in NSG mice. Enhanced 2'-O-methylation redirected the ribosome translation program toward amino acid transporter mRNAs enriched in optimal codons and subsequently increased intracellular amino acid levels. Methylation at the single site 18S-guanosine 1447 was instrumental for LSC activity. Collectively, our work demonstrates that dynamic 2'-O-methylation at specific sites on rRNAs shifts translational preferences and controls AML LSC self-renewal. SIGNIFICANCE: We establish the complete rRNA 2'-O-methylation landscape in human AML. Plasticity of rRNA 2'-O-methylation shifts protein translation toward an LSC phenotype. This dynamic process constitutes a novel concept of how cancers reprogram cell fate and function. This article is highlighted in the In This Issue feature, p. 247. A Dynamic rRNA Ribomethylome Drives Stemness in Acute Myeloid Leukemia.,Zhou F, Aroua N, Liu Y, Rohde C, Cheng J, Wirth AK, Fijalkowska D, Gollner S, Lotze M, Yun H, Yu X, Pabst C, Sauer T, Oellerich T, Serve H, Rollig C, Bornhauser M, Thiede C, Baldus C, Frye M, Raffel S, Krijgsveld J, Jeremias I, Beckmann R, Trumpp A, Muller-Tidow C Cancer Discov. 2023 Feb 6;13(2):332-347. doi: 10.1158/2159-8290.CD-22-0210. PMID:36259929[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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