This entry represents 60S ribosome subunit biogenesis protein Nip7, which is required for proper 27S pre-rRNA processing and 60S ribosome subunit assembly []. In yeast, Nip7 interacts with nucleolar proteins such as Nol8 [], and with the exosome subunit Rrp43p. Nip7 contains a PUA domain.
This entry represents the PUA (PseudoUridine synthase and Archaeosine transglycosylase) domain found in UPF0113 family members, such as ribosomal biogenesis factor NIP7 and hypothetical protein KD93 [, , ]. PUA domains are predicted to bind RNA molecules with complex folded structures []. NIP7 is required for efficient 60S ribosome subunit biogenesis and has been shown to interact with another essential nucleolar protein, Nop8p, and the exosome subunit Rrp43p. These three proteins are required for 60S subunit synthesis and may be part of a dynamic complex involved in this process.
Protein KD93 is a NIP7 homologue and belongs to the UPF0113 family. The overall fold of KD93 consists of two interlinked α/β domains. The C-terminal domain resembles the PUA domain of some RNA modification enzymes, especially that of archaeosine tRNA-ribosyltransferase (ArcTGT), suggesting a possible molecular function related to RNA binding []. This entry represents the N-terminal, pre-PUA domain.
SPB1 is an adoMet-dependent rRNA methyltransferase required for proper assembly of pre-ribosomal particles during the biogenesis of the 60S ribosomal subunit []. In Saccharomyces cerevisiae, it specifically methylates the guanosine in position 2922 of the 25S rRNA at the stage of 27S pre-rRNA maturation []. It interacts with the snoRNA-associated proteins Nop1 and Nop58 []. FTSJ3, SPB1 homologue in humans, is associated with NIP7 (involved in the biogenesis of 40S subunit) and functions in pre-rRNA processing [].
This entry includes glioma tumour suppressor candidate region gene 2 protein (GSCR2) from humans and ribosome biogenesis protein Nop53 from budding yeasts. GSCR2 bears similarity to the glioma tumour suppressor candidate region gene 2 protein (p60) []. Nop53 is a nucleolar protein that is involved in biogenesis of the 60S subunit of the ribosome []. It interacts with Nop17 and Nip7 and is required for pre-rRNA processing in Saccharomyces cerevisiae [].
This uncharacterised domain is found in the central region of fungal SPB1 and mammalian homologue FTSJ3.SPB1 is an adoMet-dependent rRNA methyltransferase required for proper assembly of pre-ribosomal particles during the biogenesis of the 60S ribosomal subunit []. In Saccharomyces cerevisiae, it specifically methylates the guanosine in position 2922 of the 25S rRNA at the stage of 27S pre-rRNA maturation []. It interacts with the snoRNA-associated proteins Nop1 and Nop58 []. FTSJ3, SPB1 homologue in humans, is associated with NIP7 (involved in the biogenesis of 40S subunit) and functions in pre-rRNA processing [].
This domain is found at the C terminus SPB1-like proteins. This domain interacts with the meandering tail of Erb1 and its removal is required to form the pre-mature inter-subunit surface of the Arx1/Nog2 particle [, ].SPB1 is an adoMet-dependent rRNA methyltransferase required for proper assembly of pre-ribosomal particles during the biogenesis of the 60S ribosomal subunit []. In Saccharomyces cerevisiae, it specifically methylates the guanosine in position 2922 of the 25S rRNA at thestage of 27S pre-rRNA maturation []. It interacts with the snoRNA-associated proteins Nop1 and Nop58 []. FTSJ3, SPB1 homologue in humans, is associated with NIP7 (involved in the biogenesis of 40S subunit) and functions in pre-rRNA processing [].
