Immunoproteasome assembly: cooperative incorporation of interferon gamma (IFN-gamma)-inducible subunits.

Immunoproteasome assembly: cooperative incorporation of interferon gamma (IFN-gamma)-inducible subunits.
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DOI:
10.1084/jem.187.1.97
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发表时间:
1998-01-05
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Colbert RA
Colbert RA
中科院分区:
其他
文献类型:
--
作者:
Griffin TA;Nandi D;Cruz M;Fehling HJ;Kaer LV;Monaco JJ;Colbert RA

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LMP 2、LMP 7和MECL是脊椎动物20 S蛋白酶体的γ-干扰素诱导的催化亚基,它们可以在蛋白酶体生物发生期间取代组成型催化亚基(分别为δ、X和Z)。我们证明,MECL需要LMP 2有效地纳入前蛋白酶体,和前蛋白酶体含有LMP 2和MECL需要LMP 7有效的成熟。后一种效应取决于LMP 7的前序,但不取决于LMP 7的催化活性。这种合作机制有利于组装的同质的“免疫蛋白酶体”含有所有三个诱导亚基,这表明这些亚基在演唱会上发挥作用,以提高蛋白酶体产生的主要组织相容性复合物I类结合肽。
LMP2, LMP7, and MECL are interferon γ–inducible catalytic subunits of vertebrate 20S proteasomes, which can replace constitutive catalytic subunits (delta, X, and Z, respectively) during proteasome biogenesis. We demonstrate that MECL requires LMP2 for efficient incorporation into preproteasomes, and preproteasomes containing LMP2 and MECL require LMP7 for efficient maturation. The latter effect depends on the presequence of LMP7, but not on LMP7 catalytic activity. This cooperative mechanism favors the assembly of homogeneous “immunoproteasomes” containing all three inducible subunits, suggesting that these subunits act in concert to enhance proteasomal generation of major histocompatibility complex class I–binding peptides.
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