Crystallin, beta A1

Beta-crystallin A3 is a protein that in humans is encoded by the CRYBA1 gene.[5][6][7]

CRYBA1
Identifiers
AliasesCRYBA1, CRYB1, CTRCT10, crystallin beta A1
External IDsOMIM: 123610 MGI: 88518 HomoloGene: 3815 GeneCards: CRYBA1
Gene location (Human)
Chr.Chromosome 17 (human)[1]
Band17q11.2Start29,246,863 bp[1]
End29,254,494 bp[1]
RNA expression pattern
More reference expression data
Orthologs
SpeciesHumanMouse
Entrez

1411

12957

Ensembl

ENSG00000108255

ENSMUSG00000000724

UniProt

P05813

P02525
Q9QXC6

RefSeq (mRNA)

NM_005208

NM_009965
NM_001313933

RefSeq (protein)

NP_005199

NP_001300862
NP_034095

Location (UCSC)Chr 17: 29.25 – 29.25 MbChr 11: 77.72 – 77.73 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

Crystallins are separated into two classes: taxon-specific, or enzyme, and ubiquitous. The latter class constitutes the major proteins of vertebrate eye lens and maintains the transparency and refractive index of the lens. Since lens central fiber cells lose their nuclei during development, these crystallins are made and then retained throughout life, making them extremely stable proteins. Mammalian lens crystallins are divided into alpha, beta, and gamma families; beta and gamma crystallins are also considered as a superfamily. Alpha and beta families are further divided into acidic and basic groups. Seven protein regions exist in crystallins: four homologous motifs, a connecting peptide, and N- and C-terminal extensions. Beta-crystallins, the most heterogeneous, differ by the presence of the C-terminal extension (present in the basic group, none in the acidic group). Beta-crystallins form aggregates of different sizes and are able to self-associate to form dimers or to form heterodimers with other beta-crystallins. This gene, a beta acidic group member, encodes two proteins (crystallin, beta A3 and crystallin, beta A1) from a single mRNA, the latter protein is 17 aa shorter than crystallin, beta A3 and is generated by use of an alternate translation initiation site. Deletion of exons 3 and 4 causes the autosomal dominant disease 'zonular cataract with sutural opacities'.[7]

References

  1. GRCh38: Ensembl release 89: ENSG00000108255 - Ensembl, May 2017
  2. GRCm38: Ensembl release 89: ENSMUSG00000000724 - Ensembl, May 2017
  3. "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. Hogg D, Tsui LC, Gorin M, Breitman ML (Oct 1986). "Characterization of the human beta-crystallin gene Hu beta A3/A1 reveals ancestral relationships among the beta gamma-crystallin superfamily". J Biol Chem. 261 (26): 12420–7. PMID 3745196.
  6. Sparkes RS, Mohandas T, Heinzmann C, Gorin MB, Zollman S, Horwitz J (Nov 1986). "Assignment of a human beta-crystallin gene to 17cen-q23". Hum Genet. 74 (2): 133–6. doi:10.1007/BF00282076. PMID 3770741.
  7. "Entrez Gene: CRYBA1 crystallin, beta A1".

Further reading


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