ATP binding to two sites is necessary for dimerization of nucleotide-binding domains of ABC proteins.
ATP binding to two sites is necessary for dimerization of nucleotide-binding domains of ABC proteins.
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ATP 与两个位点的结合对于 ABC 蛋白核苷酸结合域的二聚化是必要的。
DOI:
10.1016/j.bbrc.2013.11.050
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发表时间:
2014
影响因子:
3.1
通讯作者:
Altenberg,GuillermoA
中科院分区:
文献类型:
--
作者:
Zoghbi,MariaE;Altenberg,GuillermoA
ATP binding cassette (ABC) transporters have a functional unit formed by two transmembrane domains and two nucleotide binding domains (NBDs). ATP-bound NBDs dimerize in a head-to-tail arrangement, with two nucleotides sandwiched at the dimer interface. Both NBDs contribute residues to each of the two nucleotide-binding sites (NBSs) in the dimer. In previous studies, we showed that the prototypical NBD MJ0796 fromMethanocaldococcus jannaschiiforms ATP-bound dimers that dissociate completely following hydrolysis of one of the two bound ATP molecules. Since hydrolysis of ATP at one NBS is sufficient to drive dimer dissociation, it is unclear why all ABC proteins contain two NBSs. Here, we used luminescence resonance energy transfer (LRET) to study ATP-induced formation of NBD homodimers containing two NBSs competent for ATP binding, and NBD heterodimers with one active NBS and one binding-defective NBS. The results showed that binding of two ATP molecules is necessary for NBD dimerization. We conclude that ATP hydrolysis at one nucleotide-binding site drives NBD dissociation, but two binding sites are required to form the ATP-sandwich NBD dimer necessary for hydrolysis.
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影响因子:
2.9
作者:
I. Urbatsch;Lucille Beaudet;Isabelle Carrier;Philippe Gros
通讯作者:
Philippe Gros
影响因子:
3.5
作者:
Carrier, Isabelle;Urbatsch, Ina L.;Gros, Philippe
通讯作者:
Gros, Philippe
影响因子:
16
作者:
Smith, PC;Karpowich, N;Hunt, JF
通讯作者:
Hunt, JF
影响因子:
2.9
作者:
Kim, In-Wha;Peng, Xiang-Hong;Ambudkar, Suresh V.
通讯作者:
Ambudkar, Suresh V.
DOI:
10.1016/j.jmb.2004.07.001
发表时间:
2004
期刊:
Journal of molecular biology.
影响因子:
--
作者:
Wang,Chunyu;Karpowich,Nathan;Hunt,JohnF;Rance,Mark;Palmer,ArthurG
通讯作者:
Palmer,ArthurG