Abstract：
:Although the protein synthesis inhibitor cycloheximide (CHX) has been known for decades, its precise mechanism of action remains incompletely understood. The glutarimide portion of CHX is seen in a family of structurally related natural products including migrastatin, isomigrastatin and lactimidomycin (LTM). We found that LTM, isomigrastatin and analogs have a potent antiproliferative effect on tumor cell lines and selectively inhibit translation. A systematic comparative study of the effects of CHX and LTM on protein synthesis revealed both similarities and differences between the two inhibitors. Both LTM and CHX were found to block the translocation step in elongation. Footprinting experiments revealed protection of a single cytidine nucleotide (C3993) in the E-site of the 60S ribosomal subunit, thus defining a common binding pocket for the two inhibitors in the ribosome. These results shed new light on the molecular mechanism of inhibition of translation elongation by both CHX and LTM.
journal_name
Nat Chem Bioljournal_title
Nature chemical biologyauthors
Schneider-Poetsch T,Ju J,Eyler DE,Dang Y,Bhat S,Merrick WC,Green R,Shen B,Liu JOdoi
10.1038/nchembio.304subject
Has Abstractpub_date
2010-03-01 00:00:00pages
209-217issue
3eissn
1552-4450issn
1552-4469pii
nchembio.304journal_volume
6pub_type
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