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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P38398: Variant p.Ile21Val

Breast cancer type 1 susceptibility protein
Gene: BRCA1
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Variant information Variant position: help 21 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help US 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 Valine (V) at position 21 (I21V, p.Ile21Val). 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 Similar physico-chemical property. Both residues are medium size and hydrophobic. The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help 3 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 Found in breast-ovarian cancer patients; uncertain significance. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 21 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 1863 The length of the canonical sequence.
Location on the sequence: help MDLSALRVEEVQNVINAMQK I LECPICLELIKEPVSTKCDH 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                         MDLSALRVEEVQNVINAMQKILECPICLELIKEPVSTKCDH

Gorilla                       MDLSALRVEEVQNVINAMQKILECPICLELIKEPVSTKCDH

                              MDLSADRVEEVQNVLNAMQKILECPICLELIKEPVSTKCDH

Rhesus macaque                MDLSAVRVEEVQNVINAMQKILECPICLELIKEPVSTKCDH

Chimpanzee                    MDLSALRVEEVQNVINAMQKILECPICLELIKEPVSTKCDH

Mouse                         MDLSAVQIQEVQNVLHAMQKILECPICLELIKEPVSTKCDH

Rat                           MDLSAVRIQEVQNVLHAMQKILECPICLELIKEPVSTQCDH

Bovine                        MDLSADHVEEVQNVLNAMQKILECPICLELIKEPVSTKCDH

Caenorhabditis elegans        MADVALRITE---TVARLQKELKCGICCSTYKDPILSTCFH

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 – 1863 Breast cancer type 1 susceptibility protein
Modified residue 1 – 1 N-acetylmethionine
Alternative sequence 1 – 47 Missing. In isoform 8.
Mutagenesis 26 – 26 I -> A. Disrupts the interaction with E2 enzymes, thereby abolishing the E3 ubiquitin-protein ligase activity.
Mutagenesis 26 – 26 I -> E. No ubiquitination of RBBP8. No restoration RBBP8-mediated focus formation or G2/M checkpoint control upon DNA damage.
Helix 8 – 21



Literature citations
No reference for the current variant in UniProtKB/Swiss-Prot.
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.