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UniProtKB/Swiss-Prot P35520: Variant p.Cys165Tyr

Cystathionine beta-synthase
Gene: CBS
Variant information

Variant position:  165
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Disease [Disclaimer]
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 Cysteine (C) to Tyrosine (Y) at position 165 (C165Y, p.Cys165Tyr).
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 polar (C) to large size and aromatic (Y)
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

Variant description:  In CBSD; severe form; protein expression is comparable to wild-type; loss of cystathionine beta-synthase activity; no effect on homotetramer formation.
Any additional useful information about the variant.

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



Sequence information

Variant position:  165
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  551
The length of the canonical sequence.

Location on the sequence:   PTSGNTGIGLALAAAVRGYR  C IIVMPEKMSSEKVDVLRALG
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                         PTSGNTGIGLALAAAVRGYRCIIVMPEKMSSEKVDVLRALG

Mouse                         PTSGNTGIGLALAAAVKGYRCIIVMPEKMSMEKVDVLRALG

Rat                           PTSGNTGIGLALAAAVKGYRCIIVMPEKMSMEKVDVLRALG

Rabbit                        PTSGNTGIGLALAAAVKGYRCIIVMPEKMSLEKVDVLRALG

Slime mold                    PTSGNTGIGLALTAAIKGYKMIITLPEKMSQEKVDVLKALG

Baker's yeast                 PTSGNTGIGLALIGAIKGYRTIITLPEKMSNEKVSVLKALG

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 – 551 Cystathionine beta-synthase
Binding site 149 – 149 Pyridoxal phosphate
Beta strand 164 – 170


Literature citations

Cystathionine beta-synthase mutations: effect of mutation topology on folding and activity.
Kozich V.; Sokolova J.; Klatovska V.; Krijt J.; Janosik M.; Jelinek K.; Kraus J.P.;
Hum. Mutat. 31:809-819(2010)
Cited for: CHARACTERIZATION OF VARIANTS CBSD LEU-49; ARG-65; ARG-78; ASN-102; VAL-114; GLN-125; LYS-144; ARG-148; TYR-165; LYS-176; ALA-180; MET-191; LYS-228; ARG-262; LYS-266; THR-278; LYS-302; ARG-305; SER-307; CYS-369; LEU-422; THR-435; GLN-439; ASN-444; LEU-466 AND SER-539; FUNCTION; CATALYTIC ACTIVITY; PATHWAY; ACTIVITY REGULATION; SUBUNIT;

Two novel missense mutations in the cystathionine beta-synthase gene in homocystinuric patients.
Kluijtmans L.A.J.; Blom H.J.; Boers G.H.J.; van Oost B.A.; Trijbels F.J.M.; van den Heuvel L.P.W.J.;
Hum. Genet. 96:249-250(1995)
Cited for: VARIANTS CBSD TYR-165 AND MET-371;

Mutational analysis of the cystathionine beta-synthase gene: a splicing mutation, two missense mutations and an insertion in patients with homocystinuria.
Gordon R.B.; Cox A.J.; Dawson P.A.; Emmerson B.T.; Kraus J.P.; Dudman N.P.;
Hum. Mutat. 11:332-332(1998)
Cited for: VARIANTS CBSD LYS-144 AND TYR-165;

Impaired heme binding and aggregation of mutant cystathionine beta-synthase subunits in homocystinuria.
Janosik M.; Oliveriusova J.; Janosikova B.; Sokolova J.; Kraus E.; Kraus J.P.; Kozich V.;
Am. J. Hum. Genet. 68:1506-1513(2001)
Cited for: VARIANTS CBSD ARG-65; VAL-114; LYS-144; THR-155; TYR-165; LYS-176 AND THR-278; CHARACTERIZATION OF VARIANTS CBSD VAL-114; LYS-144; THR-155; TYR-165; LYS-176 AND THR-278;

The molecular basis of cystathionine beta-synthase deficiency in Australian patients: genotype-phenotype correlations and response to treatment.
Gaustadnes M.; Wilcken B.; Oliveriusova J.; McGill J.; Fletcher J.; Kraus J.P.; Wilcken D.E.;
Hum. Mutat. 20:117-126(2002)
Cited for: VARIANTS CBSD LEU-49; PRO-101; ARG-109; GLN-125; LYS-144; TYR-165; LYS-228; THR-278; LYS-302; SER-307; GLU-331; CYS-336; SER-347; MET-353; CYS-369; MET-371 AND GLN-439; CHARACTERIZATION OF VARIANTS CBSD PRO-101; ARG-109; LYS-228 AND SER-347;

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.