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UniProtKB/Swiss-Prot O95255: Variant p.Asp777Asn

ATP-binding cassette sub-family C member 6
Gene: ABCC6
Variant information

Variant position:  777
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  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:  From Aspartate (D) to Asparagine (N) at position 777 (D777N, p.Asp777Asn).
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 medium size and acidic (D) to medium size and polar (N)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  1
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:  In PXE; affects protein expression and trafficking; affects protein expression and trafficking; expression is reduced to less than 10%, when compared with the WT protein.
Any additional useful information about the variant.

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



Sequence information

Variant position:  777
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  1503
The length of the canonical sequence.

Location on the sequence:   QKQRLSLARAVYRKAAVYLL  D DPLAALDAHVGQHVFNQVIG
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                         QKQRLSLARAVYRKAAVYLLDDPLAALDAHVGQHVFNQVIG

Mouse                         QKQRLSLARAVYKKAAIYLLDDPLAALDAHVSQQVFKQVIG

Rat                           QKQRLSLARAVYRRAAVYLMDDPLAALDAHVSQEVFKQVIG

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 – 1503 ATP-binding cassette sub-family C member 6
Topological domain 597 – 939 Cytoplasmic
Domain 629 – 853 ABC transporter 1
Alternative sequence 100 – 1503 Missing. In isoform 2.
Beta strand 772 – 778


Literature citations

Mutation detection in the ABCC6 gene and genotype-phenotype analysis in a large international case series affected by pseudoxanthoma elasticum.
Pfendner E.G.; Vanakker O.M.; Terry S.F.; Vourthis S.; McAndrew P.E.; McClain M.R.; Fratta S.; Marais A.S.; Hariri S.; Coucke P.J.; Ramsay M.; Viljoen D.; Terry P.F.; De Paepe A.; Uitto J.; Bercovitch L.G.;
J. Med. Genet. 44:621-628(2007)
Cited for: VARIANTS PXE 60-ARG--TYR-62 DEL; ARG-317; ARG-364; TRP-382; GLY-391; ASN-392; HIS-463 HIS-495; GLN-518; PRO-535; SER-568; CYS-600; CYS-663; PRO-698; ASP-699; PRO-726; LYS-751; ARG-755; TRP-760; GLN-765; ASN-777; MET-811; SER-881; ILE-944; THR-950; ARG-992; CYS-1114; MET-1130; ALA-1133; GLN-1138; TRP-1138; THR-1139; GLN-1164; CYS-1221; HIS-1221; ILE-1226; PHE-1298; ARG-1302; PRO-1303; GLN-1314; TRP-1314; GLN-1335; CYS-1339; HIS-1339 AND THR-1342;

Structural analysis reveals pathomechanisms associated with pseudoxanthoma elasticum-causing mutations in the ABCC6 transporter.
Ran Y.; Zheng A.; Thibodeau P.H.;
J. Biol. Chem. 293:15855-15866(2018)
Cited for: X-RAY CRYSTALLOGRAPHY (2.30 ANGSTROMS) OF 622-859; CHARACTERIZATION OF VARIANTS PXE CYS-663; PRO-673; PRO-677; PRO-698; ASP-699; PRO-726; ARG-755; TRP-760; GLN-765; ASP-766; ASN-777; MET-811 AND PRO-820; GLYCOSYLATION;

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.