UniProtKB/Swiss-Prot Q9NQ38: Variant p.Lys420Glu

Serine protease inhibitor Kazal-type 5
Gene: SPINK5
Chromosomal location: 5q32
Variant information

Variant position:  420
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Polymorphism
The variants are classified into three categories: Disease, Polymorphism and Unclassified.
  • Disease: Variants have been found in patients and disease-association is reported in literature. However, this classification is not a definitive assessment of variant pathogenicity.
  • Polymorphism: No disease-association has been reported.
  • Unclassified: Variants have been found in patients but disease-association remains unclear.

Residue change:  From Lysine (K) to Glutamate (E) at position 420 (K420E, p.Lys420Glu).
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 large size and basic (K) to medium size and acidic (E)
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

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



Sequence information

Variant position:  420
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  1064
The length of the canonical sequence.

Location on the sequence:   CSMCEVFFQAEEEEKKKKEG  K SRNKRQSKSTASFEELCSEY
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.

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.

TypePositionsDescription
Chain 23 – 1064 Serine protease inhibitor Kazal-type 5
Peptide 356 – 423 Hemofiltrate peptide HF7665
Domain 361 – 423 Kazal-like 6


Literature citations

LEKTI, a novel 15-domain type of human serine proteinase inhibitor.
Maegert H.-J.; Staendker L.; Kreutzmann P.; Zucht H.-D.; Reinecke M.; Sommerhoff C.P.; Fritz H.; Forssmann W.-G.;
J. Biol. Chem. 274:21499-21502(1999)
Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORMS F-L); PARTIAL PROTEIN SEQUENCE; VARIANTS ARG-267; VAL-335; ASN-368; GLU-420 AND GLN-711; FUNCTION; TISSUE SPECIFICITY;

SPINK5, the defective gene in netherton syndrome, encodes multiple LEKTI isoforms derived from alternative pre-mRNA processing.
Tartaglia-Polcini A.; Bonnart C.; Micheloni A.; Cianfarani F.; Andre A.; Zambruno G.; Hovnanian A.; D'Alessio M.;
J. Invest. Dermatol. 126:315-324(2006)
Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORMS SHORT; F-L AND LONG); ALTERNATIVE SPLICING; VARIANTS ARG-267; VAL-335; ASN-368; GLU-420 AND GLN-711;

Gene polymorphism in Netherton and common atopic disease.
Walley A.J.; Chavanas S.; Moffatt M.F.; Esnouf R.M.; Ubhi B.; Lawrence R.; Wong K.; Abecasis G.R.; Jones E.Y.; Harper J.I.; Hovnanian A.; Cookson W.O.C.M.;
Nat. Genet. 29:175-178(2001)
Cited for: VARIANT GLU-420;

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