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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P35520: Variant p.Pro78Arg

Cystathionine beta-synthase
Gene: CBS
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Variant information Variant position: help 78 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 Proline (P) to Arginine (R) at position 78 (P78R, p.Pro78Arg). 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 medium size and hydrophobic (P) to large size and basic (R) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -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: help In CBSD; severe form; associated in cis with N-102; decreased cystathionine beta-synthase activity; decreased homotetramer formation. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 78 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 551 The length of the canonical sequence.
Location on the sequence: help RPASESPHHHTAPAKSPKIL P DILKKIGDTPMVRINKIGKK 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                         RPASESPHHHTAPAKSPK--ILPDILKKIGDTPMVRINKIGKK

Mouse                         RAMADSPHYHTVLTKSPK--ILPDILRKIGNTPMVRINKIS

Rat                           RPMADSPHYHTVPTKSPK--ILPDILRKIGNTPMVRINRIS

Rabbit                        RPVADSPHQHAALAKSPK--ILPDILQKIGDTPMVRINKIG

Slime mold                    NTTENTPH---TTRRTPKKLIMDNILDNIGGTPLVRVNKVS

Baker's yeast                 EQQADSRH---------------NVIDLVGNTPLIALKKLP
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
Chain 1 – 551 Cystathionine beta-synthase
Binding site 65 – 65 axial binding residue
Beta strand 75 – 79



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; Identical genotypes in siblings with different homocystinuric phenotypes: identification of three mutations in cystathionine beta-synthase using an improved bacterial expression system.
de Franchis R.; Kozich V.; McInnes R.; Kraus J.P.;
Hum. Mol. Genet. 3:1103-1108(1994)
Cited for: VARIANTS CBSD ARG-78 AND ASN-102;
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.