UniProtKB/Swiss-Prot P42336: Variant p.Ile391Met

Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform
Gene: PIK3CA
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Variant information Variant position:

391 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 Isoleucine (I) to Methionine (M) at position 391 (I391M, p.Ile391Met). 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
Other resources:

Links to websites of interest for the variant.

Variant rs2230461 [ dbSNP | Ensembl ]

Sequence information Variant position:

391 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length:

1068 The length of the canonical sequence.
Location on the sequence:

VNTQRVPCSNPRWNEWLNYD I YIPDLPRAARLCLSICSVKG 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                         VNTQRVPCSNPRWNEWLNYDIYIPDLPRAARLCLSICSVKG

Mouse                         VNTQRVPCSNPRWNEWLNYDIYIPDLPRAARLCLSICSVKG

Rat                           VNTQRVPCSNPRWNEWLNYDIYIPDLPRAARLCLSICSVKG

Bovine                        VNTQRVPCSNPRWNEWLNYDIYIPDLPRAARLCLSICSVKG

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 – 1068	Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform
Domain	330 – 487	C2 PI3K-type
Beta strand	382 – 392

Literature citations
PIK3CA mutations in head and neck squamous cell carcinoma.
Qiu W.; Schoenleben F.; Li X.; Ho D.J.; Close L.G.; Manolidis S.; Bennett B.P.; Su G.H.;
Clin. Cancer Res. 12:1441-1446(2006)
Cited for: VARIANTS CANCER CYS-343; LYS-542; LYS-545 AND ARG-1047; VARIANT MET-391;

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.