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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot Q9UQ84: Variant p.Glu109Lys

Exonuclease 1
Gene: EXO1
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Variant information Variant position: help 109 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help 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: help From Glutamate (E) to Lysine (K) at position 109 (E109K, p.Glu109Lys). 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 large size and basic (K) 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

Polymorphism: help 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.
Variant description: help Abrogates exonuclease activity. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 109 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 846 The length of the canonical sequence.
Location on the sequence: help ERSRRERRQANLLKGKQLLR E GKVSEARECFTRSINITHAM 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                         ERSRRERRQANLLKGKQLLREGKVSEARECFTRSINITHAM

Mouse                         ERSRRERRQSNLLKGKQLLREGKVSEARDCFARSINITHAM

Xenopus laevis                EKARREKRQTNLQKGKQLLREGKLAEARECFSRSVNITSSM

Zebrafish                     EKSRRERRQANLQKGKQLLREGKITEARECFTRSVNITPSM

Drosophila                    EKRRRDSRKQSKERAAELLRLGRIEEARSHMRRCVDVTHDM

Slime mold                    EQERLRHREEYKNKAKAYLLEGNKSQANICFQKAVDITPRM

Baker's yeast                 ESKRRDKRKENKAIAERLWACGEKKNAMDYFQKCVDITPEM

Fission yeast                 EQKRKERRQEAFELGKKLWDEGKKSQAIMQFSRCVDVTPEM

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 – 846 Exonuclease 1
Turn 108 – 110



Literature citations
Functional alterations of human exonuclease 1 mutants identified in atypical hereditary nonpolyposis colorectal cancer syndrome.
Sun X.; Zheng L.; Shen B.;
Cancer Res. 62:6026-6030(2002)
Cited for: FUNCTION; INTERACTION WITH MLH1 AND MSH2; CHARACTERIZATION OF VARIANTS LYS-109; ARG-410; SER-640; GLU-759 AND LEU-770; Germline mutations of EXO1 gene in patients with hereditary nonpolyposis colorectal cancer (HNPCC) and atypical HNPCC forms.
Wu Y.; Berends M.J.W.; Post J.G.; Mensink R.G.J.; Verlind E.; van der Sluis T.; Kempinga C.; Sijmons R.H.; van der Zee A.G.J.; Hollema H.; Kleibeuker J.H.; Buys C.H.C.M.; Hofstra R.M.W.;
Gastroenterology 120:1580-1587(2001)
Cited for: VARIANTS ALA-27; LYS-109; ARG-410; GLY-610; ALA-640; SER-640; GLU-759 AND LEU-770;
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.