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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot O94903: Variant p.Arg241Gln

Pyridoxal phosphate homeostasis protein
Gene: PLPBP
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Variant information Variant position: help 241 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 Arginine (R) to Glutamine (Q) at position 241 (R241Q, p.Arg241Gln). 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 large size and basic (R) to medium size and polar (Q) 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 EPEO1. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 241 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 275 The length of the canonical sequence.
Location on the sequence: help LSMGMSADFQHAVEVGSTNV R IGSTIFGERDYSKKPTPDKC 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                         LSMGMSADFQHAVEVGSTNVRIGSTIFGERDYSKKPTPDKC

Mouse                         LSMGMSMDFQHAIEVGSTNVRIGSTIFGERDYSKKPALDK-

Bovine                        LSMGMSVDFQHAIEVGSTNVRIGSTIFGERDYSKKT--DKP

Caenorhabditis elegans        LSMGMSDDFLQAIHQGATSVRVGSKLFGAREYKNK------

Slime mold                    LSMGMSHDFEPAIEFGSTSVRVGSAIFGERDYSNKK-----

Baker's yeast                 LSMGMSADFREAIRQGTAEVRIGTDIFGARPPKNEARII--

Fission yeast                 LSMGMSSDYLLAIKYGSDSVRVGSSIFGSRPTEKPSDVHIS
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 – 275 Pyridoxal phosphate homeostasis protein
Modified residue 226 – 226 Phosphoserine
Modified residue 244 – 244 Phosphoserine



Literature citations
Mutations in PROSC disrupt cellular pyridoxal phosphate homeostasis and cause vitamin-B6-dependent epilepsy.
Darin N.; Reid E.; Prunetti L.; Samuelsson L.; Husain R.A.; Wilson M.; El Yacoubi B.; Footitt E.; Chong W.K.; Wilson L.C.; Prunty H.; Pope S.; Heales S.; Lascelles K.; Champion M.; Wassmer E.; Veggiotti P.; de Crecy-Lagard V.; Mills P.B.; Clayton P.T.;
Am. J. Hum. Genet. 99:1325-1337(2016)
Cited for: INVOLVEMENT IN EPEO1; FUNCTION; VARIANTS EPEO1 71-GLN--HIS-275 DEL; 78-SER--HIS-275 DEL; LEU-87; PRO-175 AND GLN-241; CHARACTERIZATION OF VARIANTS EPEO1 78-SER--HIS-275 DEL AND PRO-175;
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.