UniProtKB/Swiss-Prot Q9P1W8: Variant p.Val263Ala

• Variant information
• Sequence information
• Literature citations
• All

Variant information

Variant position: 263 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 Valine (V) to Alanine (A) at position 263 (V263A, p.Val263Ala). 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 hydrophobic (V) to small size and hydrophobic (A) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: 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: Links to websites of interest for the variant.

• Variant rs6043409 [ dbSNP | Ensembl ]

Sequence information

Variant position: 263 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: 387 The length of the canonical sequence.
Location on the sequence: NLSEAIRVPPTLEVTQQPMR V GNQVNVTCQVRKFYPQSLQL 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.
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.

Type	Positions	Description
Chain	29 – 387	Signal-regulatory protein gamma
Topological domain	29 – 360	Extracellular
Domain	252 – 340	Ig-like C1-type 2
Glycosylation	243 – 243	N-linked (GlcNAc...) asparagine
Glycosylation	268 – 268	N-linked (GlcNAc...) asparagine
Alternative sequence	144 – 360	Missing. In isoform 3.
Alternative sequence	250 – 360	Missing. In isoform 4.
Beta strand	262 – 279

Literature citations

Molecular cloning of a novel human gene (SIRP-B2) which encodes a new member of the SIRP/SHPS-1 protein family.
Ichigotani Y.; Matsuda S.; Machida K.; Oshima K.; Iwamoto T.; Yamaki K.; Hayakawa T.; Hamaguchi M.;
J. Hum. Genet. 45:378-382(2000)
Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM 2); TISSUE SPECIFICITY; VARIANTS ALA-263 AND LEU-286;