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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot Q9HC16: Variant p.Arg256His

DNA dC->dU-editing enzyme APOBEC-3G
Gene: APOBEC3G
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Variant information Variant position: help 256 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help 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: help From Arginine (R) to Histidine (H) at position 256 (R256H, p.Arg256His). 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 (H) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help 0 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: 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 384 The length of the canonical sequence.
Location on the sequence: help NQRRGFLCNQAPHKHGFLEG R HAELCFLDVIPFWKLDLDQD 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                         NQRRGFLCNQAPHKHGFLEGRHAELCFLDVIPFWKLDLDQD

Gorilla                       NQRRGFLCNQAPHKHGFLEGRHAELCFLDVIPFWKLDLHQD

Chimpanzee                    NQRRGFLCNQAPHKHGFLEGRHAELCFLDVIPFWKLDLHQD

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 – 384 DNA dC->dU-editing enzyme APOBEC-3G
Domain 214 – 328 CMP/dCMP-type deaminase 2
Region 209 – 336 Necessary for homooligomerization
Active site 259 – 259 Proton donor
Binding site 257 – 257
Site 244 – 244 Interaction with DNA
Alternative sequence 80 – 384 Missing. In isoform 3.
Mutagenesis 244 – 244 N -> A. Abolishes enzyme activity.
Mutagenesis 247 – 247 P -> K. Modifies the spectrum of action against mobile genetic elements; when associated with K-217.
Mutagenesis 256 – 256 R -> E. Strongly reduces enzyme activity.
Mutagenesis 257 – 257 H -> A. Decreases cytidine deaminase activity.
Mutagenesis 259 – 259 E -> A. Loss of cytidine deaminase activity and significant decrease in antiviral activity.
Mutagenesis 259 – 259 E -> A. Loss of cytidine deaminase activity and significant decrease in antiviral activity; when associated with A-67.
Mutagenesis 259 – 259 E -> Q. Decreases cytidine deaminase activity and antiviral activity.



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.