UniProtKB/Swiss-Prot P21439: Variant p.Ser978Pro

• Variant information
• Sequence information
• Literature citations
• All

Variant information

Variant position: 978 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: LP/P [Disclaimer: Variants classification is intended for research purposes only, not for clinical and diagnostic use. The label disease variant is assigned according to literature reports on probable disease-association that can be based on theoretical reasons. This label must not be considered as a definitive proof for the pathogenic role of a variant.] 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 Serine (S) to Proline (P) at position 978 (S978P, p.Ser978Pro). 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 small size and polar (S) to medium size and hydrophobic (P) 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: In PFIC3; alters efflux activity for PC. Any additional useful information about the variant.
Other resources: Links to websites of interest for the variant.

• Variant rs1051861187 [ dbSNP | Ensembl ]

Sequence information

Variant position: 978 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: 1286 The length of the canonical sequence.
Location on the sequence: FGAYLIVNGHMRFRDVILVF S AIVFGAVALGHASSFAPDYA 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 – 1286	Phosphatidylcholine translocator ABCB4
Transmembrane	973 – 994	Helical
Domain	711 – 999	ABC transmembrane type-1 2
Mutagenesis	985 – 985	V -> M. Significantly reduces phosphatidylcholine floppase activity; when associated with Q-989 and V-990.
Mutagenesis	989 – 989	H -> Q. Significantly reduces phosphatidylcholine floppase activity; when associated with M-985 and V-990.
Mutagenesis	990 – 990	A -> V. Significantly reduces phosphatidylcholine floppase activity; when associated with M-985 and Q-989.
Helix	970 – 1012

Literature citations

Functional analysis of ABCB4 mutations relates clinical outcomes of progressive familial intrahepatic cholestasis type 3 to the degree of MDR3 floppase activity.
Gordo-Gilart R.; Andueza S.; Hierro L.; Martinez-Fernandez P.; D'Agostino D.; Jara P.; Alvarez L.;
Gut 64:147-155(2015)
Cited for: VARIANTS PFIC3 ARG-68; MET-201; HIS-459; LEU-479; PRO-978 AND LYS-1125; CHARACTERIZATION OF VARIANTS PFIC3 ARG-68; MET-201; HIS-459; LEU-479; PRO-978 AND LYS-1125; FUNCTION; SUBCELLULAR LOCATION;