Reaction: WBSCR22:TRMT112 methylates guanosine-1639 of 18S rRNA yielding 7-methylguanosine-1639
- in pathway: rRNA modification in the nucleus and cytosol
The WBSCR22:TRMT112 complex, homolog of the Bud23:Trm112 complex in yeast (Ounap et al. 2013), methylates guanosine-1639 of 18S rRNA at the N(7) position of the guanine base (Haag et al. 2015, Zorbas et al. 2015). The WBSCR22:TRMT112 complex but not its methylase activity is required for efficient processing of precursor rRNA at site 2 and site 3 (Haag et al. 2015, Zorbas et al. 2015). Hemizygosity at the region containing WBSCR22 causes Williams-Beuren syndrome (Doll and Grzeschik 2001).
Reaction - small molecule participants:
AdoHcy [nucleoplasm]
AdoMet [nucleoplasm]
Reactome.org reaction link: R-HSA-6790982
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Reaction input - small molecules:
S-adenosyl-L-methionine zwitterion
Reaction output - small molecules:
S-adenosyl-L-homocysteine zwitterion
Reactome.org link: R-HSA-6790982