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UniProtKB/Swiss-Prot P00491: Variant p.Arg234Pro

Purine nucleoside phosphorylase
Gene: PNP
Variant information

Variant position:  234
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  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:  From Arginine (R) to Proline (P) at position 234 (R234P, p.Arg234Pro).
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 (R) to medium size and hydrophobic (P)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -2
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:  In PNPD.
Any additional useful information about the variant.

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



Sequence information

Variant position:  234
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  289
The length of the canonical sequence.

Location on the sequence:   ADAVGMSTVPEVIVARHCGL  R VFGFSLITNKVIMDYESLEK
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                         ADAVGMSTVPEVIVARHCGLRVFGFSLITN-KVIMDYES--------------LEK

Mouse                         ADAVGMSTVPEVIVARHCGLRVFGFSLITN-KVVMDYEN--

Rat                           ADAVGMSTVPEVIVARHCGLRVFGFSLITN-KVVMDYNN--

Bovine                        ADAVGMSTVPEVIVARHCGLRVFGFSLITN-KVIMDYES--

Drosophila                    ADLLSMTLCPEAILAKEAGIPYASLGLVTNMECWCAKQP--

Baker's yeast                 GDAVGMSTVPEVIVARHCGWRVLALSLITN-TCVVDSPASA

Fission yeast                 ADCVGMSTVPEVVVARHCGIRVLAISLVTN-NVVVEESPSA

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 1 – 289 Purine nucleoside phosphorylase
Binding site 219 – 219 Purine nucleoside
Binding site 220 – 220 Phosphate
Binding site 243 – 243 Purine nucleoside
Site 243 – 243 Important for substrate specificity
Modified residue 251 – 251 Phosphoserine
Mutagenesis 243 – 243 N -> A. Reduces catalytic activity.
Mutagenesis 243 – 243 N -> D. Reduces catalytic activity towards inosine, hypoxanthine, guanosine and guanine. Increases catalytic activity towards adenosine and adenine.
Beta strand 234 – 244


Literature citations

Molecular analysis of mutations in a patient with purine nucleoside phosphorylase deficiency.
Aust M.R.; Andrews L.G.; Barrett M.J.; Norby-Slycord C.J.; Markert M.L.;
Am. J. Hum. Genet. 51:763-772(1992)
Cited for: VARIANT SER-51; VARIANTS PNPD GLY-128 AND PRO-234;

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.