Expasy logo

UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P43007: Variant p.Glu256Lys

Neutral amino acid transporter A
Gene: SLC1A4
Feedback?
Variant information Variant position: help 256 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 Lysine (K) at position 256 (E256K, p.Glu256Lys). 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
Variant description: help In SPATCCM; does not affect localization at the cell surface; decreased uptake of L-serine and L-alanine; Vmax is decreased by at least 50% for both substrates; 3-fold increase of affinity for L-serine; 2-fold increase of affinity for L-alanine. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 256 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 532 The length of the canonical sequence.
Location on the sequence: help ALKKLGSEGEDLIRFFNSLN E ATMVLVSWIMWYVPVGIMFL 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                         ALKKLGSEGEDLIRFFNSLNEATMVLVSWIMWYVPVGIMFL

Mouse                         ALKKLGPEGEDLIRFFNSFNEATMVLVSWIMWYVPIGIMFL

Bovine                        ALKKLGSEGEELIRFFNAFNEATMVLVSWIMWYVPVGIMFL
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 – 532 Neutral amino acid transporter A



Literature citations
A homozygous mutation in SLC1A4 in siblings with severe intellectual disability and microcephaly.
Srour M.; Hamdan F.F.; Gan-Or Z.; Labuda D.; Nassif C.; Oskoui M.; Gana-Weisz M.; Orr-Urtreger A.; Rouleau G.A.; Michaud J.L.;
Clin. Genet. 88:E1-E4(2015)
Cited for: INVOLVEMENT IN SPATCCM; VARIANT SPATCCM LYS-256; SLC1A4 mutations cause a novel disorder of intellectual disability, progressive microcephaly, spasticity and thin corpus callosum.
Heimer G.; Marek-Yagel D.; Eyal E.; Barel O.; Oz Levi D.; Hoffmann C.; Ruzzo E.K.; Ganelin-Cohen E.; Lancet D.; Pras E.; Rechavi G.; Nissenkorn A.; Anikster Y.; Goldstein D.B.; Ben Zeev B.;
Clin. Genet. 88:327-335(2015)
Cited for: INVOLVEMENT IN SPATCCM; VARIANT SPATCCM LYS-256; Mutations in SLC1A4, encoding the brain serine transporter, are associated with developmental delay, microcephaly and hypomyelination.
Damseh N.; Simonin A.; Jalas C.; Picoraro J.A.; Shaag A.; Cho M.T.; Yaacov B.; Neidich J.; Al-Ashhab M.; Juusola J.; Bale S.; Telegrafi A.; Retterer K.; Pappas J.G.; Moran E.; Cappell J.; Anyane Yeboa K.; Abu-Libdeh B.; Hediger M.A.; Chung W.K.; Elpeleg O.; Edvardson S.;
J. Med. Genet. 52:541-547(2015)
Cited for: FUNCTION; INVOLVEMENT IN SPATCCM; VARIANTS SPATCCM LYS-256 AND TRP-457; CHARACTERIZATION OF VARIANTS SPATCCM LYS-256 AND TRP-457;
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.