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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot Q9NPJ1: Variant p.Gly345Glu

Molecular chaperone MKKS
Gene: MKKS
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Variant information Variant position: help 345 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 Glutamate (E) at position 345 (G345E, p.Gly345Glu). 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 medium size and acidic (E) 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 BBS6; increases MKKS protein degradation; fails to associate with centrosome; the mutant is highly polyubiquitinated and rapidly degraded by the ubiquitin-proteasome protein degradation pathway. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 345 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 570 The length of the canonical sequence.
Location on the sequence: help TKMTGTQPIGSLGSICPNSY G SVKDVCTAKFGSKHFFHLIP 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                         TKMTGTQPIGSLGSICPNSYGSVKDVCTAKFGSKHFFHLIP

Mouse                         SKVTGATPIGSLNPIVSTTYGSVKDVCSARFGSKHFFHLLP
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 1 – 570 Molecular chaperone MKKS
Region 198 – 370 Substrate-binding apical domain



Literature citations
MKKS/BBS6, a divergent chaperonin-like protein linked to the obesity disorder Bardet-Biedl syndrome, is a novel centrosomal component required for cytokinesis.
Kim J.C.; Ou Y.Y.; Badano J.L.; Esmail M.A.; Leitch C.C.; Fiedrich E.; Beales P.L.; Archibald J.M.; Katsanis N.; Rattner J.B.; Leroux M.R.;
J. Cell Sci. 118:1007-1020(2005)
Cited for: SUBCELLULAR LOCATION; CHARACTERIZATION OF VARIANTS BBS6 ASP-52; LEU-155; ALA-286; GLU-345 AND SER-499; CHARACTERIZATION OF VARIANT PRO-325; MKKS is a centrosome-shuttling protein degraded by disease-causing mutations via CHIP-mediated ubiquitination.
Hirayama S.; Yamazaki Y.; Kitamura A.; Oda Y.; Morito D.; Okawa K.; Kimura H.; Cyr D.M.; Kubota H.; Nagata K.;
Mol. Biol. Cell 19:899-911(2008)
Cited for: SUBCELLULAR LOCATION; INTERACTION WITH STUB1; CHARACTERIZATION OF VARIANTS BBS6 CYS-37; ALA-57; SER-242; GLU-345 AND SER-499; Mutation analysis of the MKKS gene in McKusick-Kaufman syndrome and selected Bardet-Biedl syndrome patients.
Slavotinek A.M.; Searby C.; Al-Gazali L.; Hennekam R.C.M.; Schrander-Stumpel C.; Orcana-Losa M.; Pardo-Reoyo S.; Cantani A.; Kumar D.; Capellini Q.; Neri G.; Zackai E.; Biesecker L.G.;
Hum. Genet. 110:561-567(2002)
Cited for: VARIANTS BBS6 LEU-155; SER-242 AND GLU-345; VARIANT VAL-339;
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.