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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot Q14683: Variant p.Glu493Ala

Structural maintenance of chromosomes protein 1A
Gene: SMC1A
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Variant information Variant position: help 493 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 Glutamate (E) to Alanine (A) at position 493 (E493A, p.Glu493Ala). 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 acidic (E) to small size and hydrophobic (A) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -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: help In CDLS2; affects the affinity of SMC hinge dimers for DNA; mutated hinge dimers bind DNA with higher affinity than wild-type proteins. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 493 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 1233 The length of the canonical sequence.
Location on the sequence: help INKELNQVMEQLGDARIDRQ E SSRQQRKAEIMESIKRLYPG 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                         INKELNQVMEQLGDARIDRQESSRQQRKAEIMESIKRLYPG

Mouse                         INKELNQVMEQLGDARIDRQESSRQQRKAEIMESIKRLYPG

Rat                           INKELNQVMEQLGDARIDRQESSRQQRKAEIMESIKRLYPG

Bovine                        INKELNQVMEQLGDARIDRQESSRQQRKAEIMESIKRLYPG

Xenopus laevis                INSELNQVMEQLGDARIDRQESSRQQRKAEIMESIKRLYPG
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 – 1233 Structural maintenance of chromosomes protein 1A
Coiled coil 163 – 503



Literature citations
X-linked Cornelia de Lange syndrome owing to SMC1L1 mutations.
Musio A.; Selicorni A.; Focarelli M.L.; Gervasini C.; Milani D.; Russo S.; Vezzoni P.; Larizza L.;
Nat. Genet. 38:528-530(2006)
Cited for: VARIANTS CDLS2 ALA-493 AND GLN-832 DEL; Cornelia de Lange syndrome mutations in SMC1A or SMC3 affect binding to DNA.
Revenkova E.; Focarelli M.L.; Susani L.; Paulis M.; Bassi M.T.; Mannini L.; Frattini A.; Delia D.; Krantz I.; Vezzoni P.; Jessberger R.; Musio A.;
Hum. Mol. Genet. 18:418-427(2009)
Cited for: CHARACTERIZATION OF VARIANTS CDLS2 ALA-493; CYS-496 AND HIS-496; GENOMIC INSTABILITY OF CDLS CELL LINES TO IONIZING RADIATION;
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.