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UniProtKB/Swiss-Prot Q9UQ84: Variant p.Asn299Ser

Exonuclease 1
Gene: EXO1
Variant information

Variant position:  299
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  LB/B
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:  From Asparagine (N) to Serine (S) at position 299 (N299S, p.Asn299Ser).
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 (N) to small size and polar (S)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  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

Polymorphism:  Most naturally occurring variants in this protein are not associated with familial disposition to hereditary non-polyposis colorectal cancer (HNPCC) (PubMed:12517792). Furthermore, germline deletions involving this locus are not associated with clinically manifested colorectal tumors (PubMed:14623461).
Additional information on the polymorphism described.

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

Sequence information

Variant position:  299
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  846
The length of the canonical sequence.

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                         NNTFLYQLVFDPIKRKLIPLNAYED-DVDPETLS----------------------------YAGQYVDD-

Mouse                         NNTFLYQLVFDPIQRKLVPLNAYGD-DVNPETLT-------

Xenopus laevis                NNTFLYQLVFDPVERKLIPLNPYGN-DVNPEELN-------

Zebrafish                     NNTFLYQLVFDPLRRKVVPLNPYPD-HINPAALS-------

Drosophila                    EATFRHMFIYNPLERRMQRLCALEDYETDERYCS-------



Fission yeast                 DLAFRHQRVYCPKDKTLVHLSPPER-ELSVHEDA-------

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.

Chain 1 – 846 Exonuclease 1
Region 129 – 387 Interaction with MSH3
Beta strand 294 – 299

Literature citations

NIEHS SNPs program;
Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA]; VARIANTS ILE-76; GLY-93; SER-279; SER-299; ARG-354; ASN-428; MET-439; TYR-456; MET-458; LEU-460; THR-503; LYS-589; GLN-634; GLY-670; CYS-723; LEU-757 AND GLU-759;

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.