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UniProtKB/Swiss-Prot O95678: Variant p.Arg91Gly

Keratin, type II cytoskeletal 75
Gene: KRT75
Variant information

Variant position:  91
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 Arginine (R) to Glycine (G) at position 91 (R91G, p.Arg91Gly).
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 large size and basic (R) to glycine (G)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -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

Polymorphism:  The Thr-161 variant may increase risk to develop pseudofolliculitis barbae (PFB) [MIM:612318]. PFB is a common hair disorder characterized by a pustular foreign body inflammatory reaction that is induced by ingrown hairs of the facial and submental (barbea) regions after regular shaving. It occurs predominantly in black males, while it is rather rare and usually far less severe in Caucasian males.
Additional information on the polymorphism described.

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



Sequence information

Variant position:  91
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  551
The length of the canonical sequence.

Location on the sequence:   VSINGCGSSCRSGFGGRASN  R FGVNSGFGYGGGVGGGFSGP
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                         VSINGC-GSSCRSGFGGRASNRFGVNSGFGYGGGVGGGFSGP

Mouse                         VSIGGCAGSGFRGGFGGRTSSGFGGSSGFAYGGGIGGGFGG

Rat                           VSVGGCAGSGFRSGFGGRASSSF----------GYGGGFGG

Bovine                        VSISGC-GSNFRSGFGGRASSGFGVSGGFGYGGGIGGGHGG

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.

TypePositionsDescription
Chain 1 – 551 Keratin, type II cytoskeletal 75
Region 1 – 148 Head


Literature citations

A novel human type II cytokeratin, K6hf, specifically expressed in the companion layer of the hair follicle.
Winter H.; Langbein L.; Praetzel S.; Jacobs M.; Rogers M.A.; Leigh I.M.; Tidman N.; Schweizer J.;
J. Invest. Dermatol. 111:955-962(1998)
Cited for: NUCLEOTIDE SEQUENCE [MRNA]; TISSUE SPECIFICITY; VARIANTS GLY-91 AND ARG-485;

Characterization of a 300 kbp region of human DNA containing the type II hair keratin.
Rogers M.A.; Winter H.; Langbein L.; Wolf C.; Schweizer J.;
J. Invest. Dermatol. 114:464-472(2000)
Cited for: NUCLEOTIDE SEQUENCE [MRNA]; VARIANTS GLY-91 AND ARG-485;

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.