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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P02452: Variant p.Gly728Arg

Collagen alpha-1(I) chain
Gene: COL1A1
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Variant information Variant position: help 728 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 Glycine (G) to Arginine (R) at position 728 (G728R, p.Gly728Arg). 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 glycine (G) to large size and basic (R) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -2 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 OI2; results in slow procollagen cleavage by N-proteinase. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 728 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 1464 The length of the canonical sequence.
Location on the sequence: help AKGDAGAPGAPGSQGAPGLQ G MPGERGAAGLPGPKGDRGDA 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                         AKGDAGAPGAPGSQGAPGLQGMPGERGAAGLPGPKGDRGDA

                              AKGDAGAPGAPGSQGAPGLQGMPGERGAAGLPGPKGDRGDA

Mouse                         AKGDTGAPGAPGSQGAPGLQGMPGERGAAGLPGPKGDRGDA

Rat                           AKGDTGAPGAPGSQGAPGLQGMPGERGAAGLPGPKGDRGDA

Bovine                        AKGDAGAPGAPGSQGAPGLQGMPGERGAAGLPGPKGDRGDA

Chicken                       AKGDAGAPGAPGNEGPPGLEGMPGERGAAGLPGAKGDRGDP
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
Chain 162 – 1218 Collagen alpha-1(I) chain
Region 98 – 1214 Disordered
Region 179 – 1192 Triple-helical region
Modified residue 715 – 715 4-hydroxyproline
Modified residue 718 – 718 4-hydroxyproline
Modified residue 724 – 724 4-hydroxyproline
Modified residue 730 – 730 4-hydroxyproline
Modified residue 739 – 739 4-hydroxyproline



Literature citations
Variable expression of osteogenesis imperfecta in a nuclear family is explained by somatic mosaicism for a lethal point mutation in the alpha 1(I) gene (COL1A1) of type I collagen in a parent.
Wallis G.A.; Starman B.J.; Zinn A.B.; Byers P.H.;
Am. J. Hum. Genet. 46:1034-1040(1990)
Cited for: NUCLEOTIDE SEQUENCE OF 710-745; VARIANT OI2 ARG-728; Type I procollagens containing substitutions of aspartate, arginine, and cysteine for glycine in the pro alpha 1 (I) chain are cleaved slowly by N-proteinase, but only the cysteine substitution introduces a kink in the molecule.
Lightfoot S.J.; Holmes D.F.; Brass A.; Grant M.E.; Byers P.H.; Kadler K.E.;
J. Biol. Chem. 267:25521-25528(1992)
Cited for: VARIANTS OI2 ASP-275; ARG-728; CYS-896 AND ASP-1061; CHARACTERIZATION OF VARIANTS OI2 ASP-275; ARG-728; CYS-896 AND ASP-1061;
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.