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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot Q9Y606: Variant p.Arg144Trp

Pseudouridylate synthase 1 homolog
Gene: PUS1
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Variant information Variant position: help 144 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help LP/P [Disclaimer] The variants are classified into three categories: LP/P, LB/B and US.
  • LP/P: likely pathogenic or pathogenic.
  • LB/B: likely benign or benign.
  • US: uncertain significance
Residue change: help From Arginine (R) to Tryptophan (W) at position 144 (R144W, p.Arg144Trp). Indicates the amino acid change of the variant. The one-letter and three-letter codes for amino acids used in UniProtKB/Swiss-Prot are those adopted by the commission on Biochemical Nomenclature of the IUPAC-IUB.
Physico-chemical properties: help Change from large size and basic (R) to large size and aromatic (W) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -3 The score within a Blosum matrix for the corresponding wild-type to variant amino acid change. The log-odds score measures the logarithm for the ratio of the likelihood of two amino acids appearing by chance. The Blosum62 substitution matrix is used. This substitution matrix contains scores for all possible exchanges of one amino acid with another:
  • Lowest score: -4 (low probability of substitution).
  • Highest score: 11 (high probability of substitution).
More information can be found on the following page
Variant description: help In MLASA1. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 144 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 427 The length of the canonical sequence.
Location on the sequence: help GCIPENHGEDMRKMSFQRCA R TDKGVSAAGQVVSLKVWLID The residue change on the sequence. Unless the variant is located at the beginning or at the end of the protein sequence, both residues upstream (20) and downstream (20) of the variant will be shown.
Residue conservation: help The multiple alignment of the region surrounding the variant against various orthologous sequences. 
Human                         GCIPENHGEDMRKMSFQRCARTDKGVSAAGQVVSLKVWLID-

Mouse                         GCIPENHGTDMRKMSFQRCARTDKGVSAAGQVVSLKVWLID

Rat                           GCIPENHGTDMRKMSFQRCARTDKGVSAAGQVVSLKVWLID

Baker's yeast                 GAISKDNSNDLKKNGFMRAARTDKGVHAGGNLISLKMIIED

Fission yeast                 GAVSSYNADDPKKVALARAARTDKGVHAAGNVISLKLIMED
Sequence annotation in neighborhood: help The regions or sites of interest surrounding the variant. In general the features listed are posttranslational modifications, binding sites, enzyme active sites, local secondary structure or other characteristics reported in the cited references. The "Sequence annotation in neighborhood" lines have a fixed format:
  • Type: the type of sequence feature.
  • Positions: endpoints of the sequence feature.
  • Description: contains additional information about the feature.
TypePositionsDescription
Active site 146 – 146 Nucleophile
Mutagenesis 146 – 146 D -> A. Loss of enzyme activity.



Literature citations
Missense mutation in pseudouridine synthase 1 (PUS1) causes mitochondrial myopathy and sideroblastic anemia (MLASA).
Bykhovskaya Y.; Casas K.; Mengesha E.; Inbal A.; Fischel-Ghodsian N.;
Am. J. Hum. Genet. 74:1303-1308(2004)
Cited for: VARIANT MLASA1 TRP-144; TISSUE SPECIFICITY; Systematic molecular genetic analysis of congenital sideroblastic anemia: evidence for genetic heterogeneity and identification of novel mutations.
Bergmann A.K.; Campagna D.R.; McLoughlin E.M.; Agarwal S.; Fleming M.D.; Bottomley S.S.; Neufeld E.J.;
Pediatr. Blood Cancer 54:273-278(2010)
Cited for: VARIANT MLASA1 TRP-144;
Disclaimer: Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. They are not in any way intended to be used as a substitute for professional medical advice, diagnostic, treatment or care.