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UniProtKB/Swiss-Prot Q969Y2: Variant p.Ala322Pro

tRNA modification GTPase GTPBP3, mitochondrial
Gene: GTPBP3
Variant information

Variant position:  322
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Polymorphism
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 Alanine (A) to Proline (P) at position 322 (A322P, p.Ala322Pro).
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 small size and hydrophobic (A) to medium size and hydrophobic (P)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -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

Polymorphism:  Val-250 variation may influence aminoglycoside-induced deafness (AID) [MIM:580000]. AID is characterized by deafness, varying from profond congenital hearing loss to normal hearing, and is caused by homoplasmic A1555G mutation in the mitochondrial 12S rRNA. Val-250 may affect the accuracy of codon-anticodon interaction, leading to modulate the translational efficiency and thereby affecting the severity of deafness in patients homozygous for 12S rRNA A1555G mutation.
Additional information on the polymorphism described.

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

Sequence information

Variant position:  322
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  492
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.

Residue conservation: 
The multiple alignment of the region surrounding the variant against various orthologous sequences.






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 82 – 492 tRNA modification GTPase GTPBP3, mitochondrial
Domain 249 – 416 TrmE-type G

Literature citations

Mutations in GTPBP3 cause a mitochondrial translation defect associated with hypertrophic cardiomyopathy, lactic acidosis, and encephalopathy.
Kopajtich R.; Nicholls T.J.; Rorbach J.; Metodiev M.D.; Freisinger P.; Mandel H.; Vanlander A.; Ghezzi D.; Carrozzo R.; Taylor R.W.; Marquard K.; Murayama K.; Wieland T.; Schwarzmayr T.; Mayr J.A.; Pearce S.F.; Powell C.A.; Saada A.; Ohtake A.; Invernizzi F.; Lamantea E.; Sommerville E.W.; Pyle A.; Chinnery P.F.; Crushell E.; Okazaki Y.; Kohda M.; Kishita Y.; Tokuzawa Y.; Assouline Z.; Rio M.; Feillet F.; Mousson de Camaret B.; Chretien D.; Munnich A.; Menten B.; Sante T.; Smet J.; Regal L.; Lorber A.; Khoury A.; Zeviani M.; Strom T.M.; Meitinger T.; Bertini E.S.; Van Coster R.; Klopstock T.; Rotig A.; Haack T.B.; Minczuk M.; Prokisch H.;
Am. J. Hum. Genet. 95:708-720(2014)
Cited for: INVOLVEMENT IN COXPD23; VARIANTS COXPD23 LEU-3; LYS-142; VAL-159; PRO-162; GLY-222; HIS-257; GLY-312--VAL-319 DEL; HIS-337 AND LYS-459; VARIANTS LYS-225 AND PRO-322;

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.