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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P35520: Variant p.Ile278Ser

Cystathionine beta-synthase
Gene: CBS
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Variant information Variant position: help 278 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 Isoleucine (I) to Serine (S) at position 278 (I278S, p.Ile278Ser). 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 (I) to small size and polar (S) 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; loss of activity. Any additional useful information about the variant.


Sequence information Variant position: help 278 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 GGTITGIARKLKEKCPGCRI I GVDPEGSILAEPEELNQTEQ 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                         GGTITGIARKLKEKCPGCRIIGVDPEGSILAEPEELNQTEQ

Mouse                         GGTITGIARKLKEKCPGCKIIGVDPEGSILAEPEELNQTEQ

Rat                           GGTITGIARKLKEKCPGCKIIGVDPEGSILAEPEELNQTEQ

Rabbit                        GGTITGIARKLKEKCPGCQIIGVDPEGSILAEPEELNQTEV

Slime mold                    GGTITGIARKIKERLPNCIVVGVDPHGSILAQPESLNNTNK

Baker's yeast                 GGTISGISKYLKEQNDKIQIVGADPFGSILAQPENLNKTDI
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
Mutagenesis 272 – 272 C -> A. Reduced heme content and cystathionine beta-synthase activity.
Mutagenesis 275 – 275 C -> S. Reduced heme content and cystathionine beta-synthase activity.
Beta strand 276 – 282



Literature citations
Identification and functional analyses of CBS alleles in Spanish and Argentinian homocystinuric patients.
Cozar M.; Urreizti R.; Vilarinho L.; Grosso C.; Dodelson de Kremer R.; Asteggiano C.G.; Dalmau J.; Garcia A.M.; Vilaseca M.A.; Grinberg D.; Balcells S.;
Hum. Mutat. 32:835-842(2011)
Cited for: VARIANTS CBSD MET-173 DEL; LEU-200; SER-278; ASN-281; VAL-321 AND SER-446; CHARACTERIZATION OF VARIANTS CBSD MET-173 DEL; SER-278; ASN-281 AND VAL-321;
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.