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Structural basis for midbody targeting of spastin by the ESCRT‐III protein CHMP1B
Author(s) -
Yang Dong,
Rismanchi Neggy,
Renvoise Benoit,
LippincottSchwartz jennifer,
Blackstone Craig,
Hurley James
Publication year - 2009
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.23.1_supplement.864.2
Subject(s) - midbody , escrt , cytokinesis , microbiology and biotechnology , chemistry , endosome , biology , biochemistry , cell division , cell , intracellular
The endosomal sorting complex required for transport (ESCRT) machinery, including ESCRT‐III, localizes to the midbody and participates in the membrane‐abscission step of cytokinesis. The ESCRT‐III protein chromatin‐modifying protein 1B (CHMP1B) is required for recruitment of the MIT domain‐containing protein spastin, a microtubule‐severing enzyme, to the midbody. The 2.5‐A structure of the C‐terminal tail of CHMP1B with the MIT domain of spastin reveals a specific, high‐affinity complex involving a noncanonical binding site between the first and third helices of the MIT domain. The structural interface is twice as large as that of the MIT domain of the VPS4‐CHMP complex, consistent with the high affinity of the interaction. A series of unique hydrogen‐bonding interactions and close packing of small side chains discriminate against the other ten human ESCRT‐III subunits. Point mutants in the CHMP1B binding site of spastin block recruitment of spastin to the midbody.