UniProtKB/Swiss-Prot Q9NWF4: Variant p.Val296Met

• Variant information
• Sequence information
• Literature citations
• All

Variant information

Variant position: 296 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 Methionine (M) at position 296 (V296M, p.Val296Met). 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: Similar physico-chemical property. Both residues are medium size and hydrophobic. 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
Variant description: Riboflavin transport is unaffected. Any additional useful information about the variant.
Other resources: Links to websites of interest for the variant.

• Variant rs2304445 [ dbSNP | Ensembl ]

Sequence information

Variant position: 296 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: 448 The length of the canonical sequence.
Location on the sequence: SAHGAFLLGLMAFTSAVTNG V LPSVQSFSCLPYGRLAYHLA 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	1 – 448	Solute carrier family 52, riboflavin transporter, member 1
Transmembrane	280 – 300	Helical
Alternative sequence	168 – 448	Missing. In isoform 2.

Literature citations

Maternal riboflavin deficiency, resulting in transient neonatal-onset glutaric aciduria Type 2, is caused by a microdeletion in the riboflavin transporter gene GPR172B.
Ho G.; Yonezawa A.; Masuda S.; Inui K.; Sim K.G.; Carpenter K.; Olsen R.K.; Mitchell J.J.; Rhead W.J.; Peters G.; Christodoulou J.;
Hum. Mutat. 32:E1976-E1984(2011)
Cited for: VARIANTS ARG-70; VAL-271 AND MET-296; CHARACTERIZATION OF VARIANTS ARG-70 AND MET-296; INVOLVEMENT IN RBFVD;