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UniProtKB/Swiss-Prot Q9H221: Variant p.Tyr54Cys

ATP-binding cassette sub-family G member 8
Gene: ABCG8
Variant information

Variant position:  54
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Polymorphism
The variants are classified into three categories: Disease, Polymorphism and Unclassified.
  • Disease: Variants implicated in disease according to literature reports.
  • Polymorphism: Variants not reported to be implicated in disease.
  • Unclassified: Variants with uncertain implication in disease according to literature reports. Evidence against or in favor of a pathogenic role is limited and/or conflicting.

Residue change:  From Tyrosine (Y) to Cysteine (C) at position 54 (Y54C, p.Tyr54Cys).
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:  Change from large size and aromatic (Y) to medium size and polar (C)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -2
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

Other resources:  
Links to websites of interest for the variant.



Sequence information

Variant position:  54
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  673
The length of the canonical sequence.

Location on the sequence:   NSLYFTYSGQPNTLEVRDLN  Y QVDLASQVPWFEQLAQFKMP
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: 
The multiple alignment of the region surrounding the variant against various orthologous sequences.

Human                         NSLYFTYSGQPNTLEVRDLNYQ----------------------VDLASQVPWFEQLAQFKMP

Mouse                         NSLYFTYSGQSNTLEVRDLTYQ-------------------

Rat                           NSLYFTYSGQSNTLEVRDLTYQGGTCLRSWGQEDPHMSLGL

Slime mold                    NKNYNKNKKEKNKNKI-DPEF--------------------

Sequence annotation in neighborhood:  
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
Chain 1 – 673 ATP-binding cassette sub-family G member 8
Topological domain 1 – 416 Cytoplasmic
Domain 47 – 313 ABC transporter


Literature citations

Accumulation of dietary cholesterol in sitosterolemia caused by mutations in adjacent ABC transporters.
Berge K.E.; Tian H.; Graf G.A.; Yu L.; Grishin N.V.; Schultz J.; Kwiterovich P.; Shan B.; Barnes R.; Hobbs H.H.;
Science 290:1771-1775(2000)
Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM 1); FUNCTION; VARIANTS STSL1 THR-231; GLN-263; ARG-574 AND ARG-596; VARIANT CYS-54;

Two genes that map to the STSL locus cause sitosterolemia: genomic structure and spectrum of mutations involving sterolin-1 and sterolin-2, encoded by ABCG5 and ABCG8, respectively.
Lu K.; Lee M.-H.; Hazard S.; Brooks-Wilson A.; Hidaka H.; Kojima H.; Ose L.; Stalenhoef A.F.H.; Mietinnen T.; Bjorkhem I.; Bruckert E.; Pandya A.; Brewer H.B. Jr.; Salen G.; Dean M.; Srivastava A.K.; Patel S.B.;
Am. J. Hum. Genet. 69:278-290(2001)
Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA / MRNA] (ISOFORMS 1 AND 2); FUNCTION; TISSUE SPECIFICITY; VARIANTS STSL1 HIS-184; THR-231; LYS-238; GLN-263; HIS-405; PRO-501; SER-543; PHE-570 DEL; PRO-572; ARG-574; GLU-574 AND ARG-596; VARIANTS HIS-19; CYS-54; VAL-259; LYS-400; ARG-575 AND ALA-632;

Mutations in ATP-cassette binding proteins G5 (ABCG5) and G8 (ABCG8) causing sitosterolemia.
Hubacek J.A.; Berge K.E.; Cohen J.C.; Hobbs H.H.;
Hum. Mutat. 18:359-360(2001)
Cited for: VARIANTS HIS-19; CYS-54; LYS-400; ALA-632 AND PHE-641;

Catalog of 605 single-nucleotide polymorphisms (SNPs) among 13 genes encoding human ATP-binding cassette transporters: ABCA4, ABCA7, ABCA8, ABCD1, ABCD3, ABCD4, ABCE1, ABCF1, ABCG1, ABCG2, ABCG4, ABCG5, and ABCG8.
Iida A.; Saito S.; Sekine A.; Mishima C.; Kitamura Y.; Kondo K.; Harigae S.; Osawa S.; Nakamura Y.;
J. Hum. Genet. 47:285-310(2002)
Cited for: VARIANTS CYS-54 AND LYS-400;

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.