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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P11686: Variant p.Ile73Thr

Pulmonary surfactant-associated protein C
Gene: SFTPC
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Variant information Variant position: help 73 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help LP/P [Disclaimer] 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: help From Isoleucine (I) to Threonine (T) at position 73 (I73T, p.Ile73Thr). 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: help Change from medium size and hydrophobic (I) to medium size and polar (T) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -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: help In SMDP2; abnormal trafficking and accumulation of aberrantly processed proSPC within alveoli. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 73 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 197 The length of the canonical sequence.
Location on the sequence: help ALLMGLHMSQKHTEMVLEMS I GAPEAQQRLALSEHLVTTAT 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: help The multiple alignment of the region surrounding the variant against various orthologous sequences. 
Human                         ALLMGLHMSQKHTEMVLEMSIGA-PEAQQRLALSEHLVTTAT

                              ALLMGL-----------------------------------

Rhesus macaque                ALLMGLHMSQKHTEMVLEMSIGA-PEAQQHLARSGHLVTTA

Mouse                         ALLMGLHMSQKHTEMVLEMSIGA-PETQKRLAPSERADTIA

Rat                           ALLMGLHMSQKHTEMVLEMSIGGAPETQKRLALSEHTDTIA

Pig                           ALLMGL-----------------------------------

Bovine                        ALLMGLHMSQKHTEMVLEMSITG-PEAQQRLALSERVGTTA

Rabbit                        ALLMGLHMSQKHTEMVLEMSIGA-PEVQQRLALSEWAGTTA
Sequence annotation in neighborhood: help 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.
TypePositionsDescription
Propeptide 59 – 197



Literature citations
Mutation of SFTPC in infantile pulmonary alveolar proteinosis with or without fibrosing lung disease.
Tredano M.; Griese M.; Brasch F.; Schumacher S.; de Blic J.; Marque S.; Houdayer C.; Elion J.; Couderc R.; Bahuau M.;
Am. J. Med. Genet. A 126:18-26(2004)
Cited for: VARIANTS SMDP2 THR-73 AND GLN-167; Interstitial lung disease in a baby with a de novo mutation in the SFTPC gene.
Brasch F.; Griese M.; Tredano M.; Johnen G.; Ochs M.; Rieger C.; Mulugeta S.; Mueller K.M.; Bahuau M.; Beers M.F.;
Eur. Respir. J. 24:30-39(2004)
Cited for: VARIANT SMDP2 THR-73; CHARACTERIZATION OF VARIANT SMDP2 THR-73; Variable phenotype associated with SP-C gene mutations: fatal case with the I73T mutation.
Percopo S.; Cameron H.S.; Nogee L.M.; Pettinato G.; Montella S.; Santamaria F.;
Eur. Respir. J. 24:1072-1073(2004)
Cited for: VARIANT SMDP2 THR-73;
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.