Involved in mitochondrial ribosome assembly. 5-methylcytosine rRNA methyltransferase that probably is involved in mitochondrial ribosome small subunit (SSU) maturation by methylation of mitochondrial 12S rRNA; the function is independent of MTERFD2/MTERF4 and assembled mitochondrial ribosome large subunit (LSU). Targeted to LSU by MTERFD2/MTERF4 and probably is involved in a final step in ribosome biogenesis to ensure that SSU and LSU are assembled. In vitro can methylate 16S rRNA of the LSU; the methylation is enhanced by MTERFD/MTERF4.
Background References
1. Metodiev MD et al.SUN4 is a dual function mitochondrial protein required for both methylation of 12S rRNA and coordination of mitoribosomal assembly.LoS Genet 10(2):e1004110 (2014).
2. Yakubovskaya Et al.tructure of the essential MTERF4:NSUN4 protein complex reveals how an MTERF protein collaborates to facilitate rRNA modification.Structure 20(11):1940-7 (2012).
Sequence Similarity
Belongs to the class I-like SAM-binding methyltransferase superfamily. RsmB/NOP family.
Western blot analysis of NSUN4 on different lysates with Rabbit anti-NSUN4 antibody (R1706-16) at 1/2,000 dilution.
Lane 1: MCF7 (Human breast cancer cell) cell lysate
Lysates/proteins at 15 µg/Lane. Exposure time: 42 seconds; ECL: K1801
Blocking: 5% NFDM/TBST, 1 hour at room temperature Primary antibody: R1706-16, 1/2,000 in 5% NFDM/TBST, 2 hours at room temperature Secondary antibody: Goat anti-Rabbit IgG-HRP (HA1001), 1/50,000 in 5% NFDM/TBST, 1 hour at room temperature
ICC staining NSUN4 in A549 cells (green). The nuclear counter stain is DAPI (blue). Cells were fixed in paraformaldehyde, permeabilised with 0.25% Triton X100/PBS.
ICC staining NSUN4 in HepG2 cells (green). The nuclear counter stain is DAPI (blue). Cells were fixed in paraformaldehyde, permeabilised with 0.25% Triton X100/PBS.
ICC staining NSUN4 in MCF-7 cells (green). The nuclear counter stain is DAPI (blue). Cells were fixed in paraformaldehyde, permeabilised with 0.25% Triton X100/PBS.
Immunohistochemical analysis of paraffin-embedded human liver cancer tissue using anti-NSUN4 antibody. Counter stained with hematoxylin.
Immunohistochemical analysis of paraffin-embedded human kidney tissue using anti-NSUN4 antibody. Counter stained with hematoxylin.
Immunohistochemical analysis of paraffin-embedded mouse testis tissue using anti-NSUN4 antibody. Counter stained with hematoxylin.
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