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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P35606: Variant p.Arg254Cys

Coatomer subunit beta'
Gene: COPB2
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Variant information Variant position: help 254 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help US 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 Cysteine (C) at position 254 (R254C, p.Arg254Cys). 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 (C) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -3 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 MCPH19; uncertain significance. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 254 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 906 The length of the canonical sequence.
Location on the sequence: help CASFHPELPIIITGSEDGTV R IWHSSTYRLESTLNYGMERV 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                         CASFHPELPIIITGSEDGTVRIWHSSTYRLESTLNYGMERV

Mouse                         CASFHPELPIIITGSEDGTVRIWHSSTYRLESTLNYGMERV

Rat                           CATFHPELPIIITGSEDGTVRIWHSSTYRLESTLNYGMERV

Bovine                        CASFHPELPIIITGSEDGTVRIWHSSTYRLESTLNYGMERV

Caenorhabditis elegans        SVCFHPELPLIITGSEDSTVRLWHANTYRLETTLNYGLERV

Drosophila                    AVCFHPELPIVLTGSEDGTVRIWHSGTYRLETCLNYGFERV

Slime mold                    VVCYHPELPLILSGSEDGTVKLWHSSTYRLERTLNYGMGFV

Baker's yeast                 FAVFHPTLPIIISGSEDGTLKIWNSSTYKVEKTLNVGLERS

Fission yeast                 FAFFHSKFPIIISGSEDGTVKIWHTLSYSLIKSYNFSLDRA

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 2 – 906 Coatomer subunit beta'
Repeat 227 – 266 WD 6
Beta strand 251 – 257



Literature citations
Copb2 is essential for embryogenesis and hypomorphic mutations cause human microcephaly.
DiStasio A.; Driver A.; Sund K.; Donlin M.; Muraleedharan R.M.; Pooya S.; Kline-Fath B.; Kaufman K.M.; Prows C.A.; Schorry E.; Dasgupta B.; Stottmann R.W.;
Hum. Mol. Genet. 26:4836-4848(2017)
Cited for: INVOLVEMENT IN MCPH19; VARIANT MCPH19 CYS-254;
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.