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BCL2L13
BCL2-like 13 (apoptosis facilitator), also known as BCL2L13 or Bcl-rambo, is a protein which in humans is encoded by the ''BCL2L13'' gene on chromosome 22. This gene encodes a mitochondrially-localized protein which is classified under the Bcl-2 protein family. Overexpression of the encoded protein results in apoptosis.〔(【引用サイトリンク】 url = http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=23786 )〕 As a result, it has been implicated in cancers such as childhood acute lymphoblastic leukemia (ALL) and glioblastoma multiforme (GBM). Alternatively spliced transcript variants have been observed for this gene, such as Bcl-rambo beta.〔
== Structure ==
As a member of the Bcl-2 protein family, Bcl-rambo comprises four conserved BH domains and a transmembrane (TM) domain. However, unlike the other members, Bcl-rambo does not require the BH domains for its apoptotic function, relying instead on the mitochondrial localization carried out by the TM domain. In addition to these domains, it has conserved B-cell lymphoma 2 homology motifs, as well as an extension at its c-terminal, termed the BHNo domain, which contains two tandem repeats, RTA and RTB.〔〔
An alternatively-spliced protein variant, called Bcl-rambo beta, is composed of only the BH4 domain, completely lacking the BH domains 1 through 3 due to an in-frame stop codon inserted by an Alu element. Without the TM domain, this variant remains in the cytosol and does not localize to the mitochondria. Nonetheless, it still performs proapoptotic activity, mediated by the encoded Alu element, though the exact mechanisms remain to be elucidated.〔
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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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