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UniProtKB/Swiss-Prot P02768: Variant p.Leu90Pro

Serum albumin
Gene: ALB
Variant information

Variant position:  90
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Disease [Disclaimer]
The variants are classified into three categories: Disease, Polymorphism and Unclassified.
  • Disease: Variants implicated in disease according to literature reports.
  • Polymorphism: Variants not reported to be implicated in disease.
  • Unclassified: Variants with uncertain implication in disease according to literature reports. Evidence against or in favor of a pathogenic role is limited and/or conflicting.

Residue change:  From Leucine (L) to Proline (P) at position 90 (L90P, p.Leu90Pro).
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:  -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

Involvement in disease:  Hyperthyroxinemia, familial dysalbuminemic (FDAH) [MIM:615999]: A disorder characterized by abnormally elevated levels of total serum thyroxine (T4) in euthyroid patients. It is due to abnormal serum albumin that binds T4 with enhanced affinity. {ECO:0000269|PubMed:7852505, ECO:0000269|PubMed:8048949, ECO:0000269|PubMed:9329347, ECO:0000269|PubMed:9589637}. Note=The disease is caused by mutations affecting the gene represented in this entry.
The name and a short description of the disease associated with the variant. For more information about the disease, the user can refer to OMIM, following the link provided after the disease acronym.

Variant description:  In FDAH.
Any additional useful information about the variant.

Other resources:  
Links to websites of interest for the variant.

Sequence information

Variant position:  90
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  609
The length of the canonical sequence.

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.

Chain 25 – 609 Serum albumin
Domain 19 – 210 Albumin 1
Metal binding 91 – 91 Zinc; via tele nitrogen
Site 88 – 88 Not glycated
Site 97 – 97 Not glycated
Modified residue 82 – 82 Phosphoserine; by FAM20C
Modified residue 89 – 89 Phosphoserine; by FAM20C
Modified residue 107 – 107 Phosphothreonine; by FAM20C
Glycosylation 75 – 75 N-linked (Glc) (glycation) lysine; in vitro
Alternative sequence 43 – 234 Missing. In isoform 2.
Mutagenesis 91 – 91 H -> A. Impairs metal binding.
Helix 90 – 99

Literature citations

Familial dysalbuminemic hypertriiodothyroninemia: a new, dominantly inherited albumin defect.
Sunthornthepvarakul T.; Likitmaskul S.; Ngowngarmratana S.; Angsusingha K.; Kitvitayasak S.; Scherberg N.H.; Refetoff S.;
J. Clin. Endocrinol. Metab. 83:1448-1454(1998)
Cited for: VARIANT FDAH PRO-90;

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.