Abstract
Fibrillarin is a phylogenetically conserved protein essential for efficient processing of pre-rRNA through its association with a class of small nucleolar RNAs during ribosomal biogenesis. The protein is the antigen for the autoimmune disease scleroderma. Here we report the crystal structure of the fibrillarin homologue from Methanococcus jannaschii, a hyperthermophile, at 1.6 A resolution. The structure consists of two domains, with a novel fold in the N-terminal region and a methyltransferase-like domain in the C-terminal region. Mapping temperature-sensitive mutations found in yeast fibrillarin Nop1 to the Methanococcus homologue structure reveals that many of the mutations cluster in the core of the methyltransferase-like domain.
Publication types
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Research Support, U.S. Gov't, Non-P.H.S.
MeSH terms
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Amino Acid Sequence
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Antigens, Bacterial / chemistry
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Bacterial Proteins / chemistry*
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Chromosomal Proteins, Non-Histone / chemistry*
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Crystallography, X-Ray
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Fungal Proteins / genetics
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Methanococcus / chemistry*
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Methyltransferases / chemistry
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Models, Molecular
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Molecular Sequence Data
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Mutation
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Nuclear Proteins / genetics
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Protein Structure, Secondary
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Protein Structure, Tertiary
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Recombinant Proteins / chemistry
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Ribonucleoproteins, Small Nucleolar*
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Saccharomyces cerevisiae Proteins*
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Sequence Alignment
Substances
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Antigens, Bacterial
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Bacterial Proteins
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Chromosomal Proteins, Non-Histone
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Fungal Proteins
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NOP1 protein, S cerevisiae
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Nuclear Proteins
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Recombinant Proteins
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Ribonucleoproteins, Small Nucleolar
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Saccharomyces cerevisiae Proteins
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fibrillarin
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Methyltransferases