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UniProtKB/Swiss-Prot Q13426: Variant p.Gln240Pro

DNA repair protein XRCC4
Gene: XRCC4
Variant information

Variant position:  240
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  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:  From Glutamine (Q) to Proline (P) at position 240 (Q240P, p.Gln240Pro).
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 medium size and polar (Q) to medium size and hydrophobic (P)
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:  240
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  336
The length of the canonical sequence.

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                         E----------------MTADRDPVY-----------------DESTDEESENQTDLSGLASAAVSKDD-----------------------------------------------------------SIISS

Mouse                         D----------------KTPEEHGLY---------------


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.

Chain 1 – 336 DNA repair protein XRCC4
Region 212 – 249 Disordered
Modified residue 229 – 229 Phosphotyrosine
Modified residue 232 – 232 Phosphoserine
Modified residue 233 – 233 Phosphothreonine; by CK2
Modified residue 237 – 237 Phosphoserine
Modified residue 256 – 256 Phosphoserine
Modified residue 260 – 260 Phosphoserine; by PRKDC
Mutagenesis 233 – 233 T -> A. Abolished phosphorylation by CK2, leading to strongly reduced interaction with PNKP.
Mutagenesis 235 – 235 E -> F. Impaired ability mediate double-strand break repair.
Mutagenesis 260 – 260 S -> A. Reduced phosphorylation by PRKDC. In XRCC4-Ala mutant; abolished phosphorylation by PRKDC; does not affect ability to bridge DNA when associated with NHEJ1/XLF phosphorylation-defective mutant; when associated with A-193, A-304, A-315, A-320, A-323, A-327 and A-328.
Mutagenesis 260 – 260 S -> D. In XRCC4-Asp mutant; phospho-mimetic mutant; abolished ability to bridge DNA when associated with NHEJ1/XLF phospho-mimetic mutant; when associated with D-193, D-304, D-315, D-320, D-323, D-327 and D-328.

Literature citations

No reference for the current variant in UniProtKB/Swiss-Prot.

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.