2022-06-08 REL RCSB RCSB RCSB 2020-12-02 2021-11-10 2021-11-10 2022-06-08 National Institutes of Health/National Center for Research Resources (NIH/NCRR) P50 AI150464 United States National Institutes of Health/National Center for Research Resources (NIH/NCRR) R35 GM122588 United States National Institutes of Health/National Center for Research Resources (NIH/NCRR) R01-GM032384 United States The stress-sensing domain of activated IRE1a forms helical filaments in narrow ER membrane tubes Carter SD Tran NH De Maziere A Ashkenazi A Klumpermann J Walter P Jensen GJ Tran NH Carter SD De Maziere A Ashkenazi A Klumperman J Walter P Jensen GJ The stress-sensing domain of activated IRE1 alpha forms helical filaments in narrow ER membrane tubes. Science US 374 52 57 2021 34591618 doi:10.1126/science.abh2474 1095-9203 0038 SCIEAS EMD-23060 associated EM volume Double-helical arrangement of human IRE1a luminal domain in 30 nm ER tubes Double-helical arrangement of human IRE1a luminal domain in 30 nm ER tubes 0 1
Cryo-CLEM was used to target IRE1a fused to fluorescent protein mNeonGreen (mNG) for cryo-ET imaging.
Homo sapiens ER IRE1a lumenal domain LEVO MPARRLLLLLTLLLPGLGIFGSTSTVTLPETLLFVSTLDGSLHAVSKRTGSIKWTLKEDPVLQVPTHVEEPAFLPDPNDGSLYTLGSKNNEGLTKLPFTIPELVQASPCRSSDGILYMGKKQDIWYVIDLLTGEKQQTLSSAFADSLCPSTSLLYLGRTEYTITMYDTKTRELRWNATYFDYAASLPEDDVDYKMSHFVSNGDGLVVTVDSESGDVLWIQNYASPVVAFYVWQREGLRKVMHINVAVETLRYLTFMSGEVGRITKWKYPFPKETEAKSKLTPTLYVGKYSTSLYASPSMVHEGVAVVPRGSTLPLLEGPQTDGVTIGDKGECVITPSTDVKFDPGLKSKNKLNYLRNYWLLIGHHETPLSASTKMLERFPNNLPKHRENVIPADSEKKSFEEVINLVDQTSENAPTTVSRDVEEKPAHAPARPEAPVDSMLKD subtomogramAveraging filament 7.0 Quantifoil R2/2 GOLD 200 CARBON HOLEY 5.0 ETHANE-PROPANE 90 310.15 FEI VITROBOT MARK III
Manual blotting from the gold side of the grid (opposite side to cells)..
in situ imaging in a near-native state
 FEI POLARA 300 FLOOD BEAM BRIGHT FIELD FIELD EMISSION GUN 300 2.2 34000.0 NITROGEN 20 GATAN K2 SUMMIT (4k x 4k) COUNTING 1.5
Images were collected using a bidirectional tilt-scheme.
 1 32.6 45 C2 30.0 FSC 0.143 CUT-OFF EMAN2 2.3 653 3 653 Manually every ~85A along the filament
e2boxer.py
 EMAN2 2.3 CTF
CTF correction was performed in EMAN2
 NOT APPLICABLE emd_23060.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 56 56 56 0 0 0 56 56 56 365.12 365.12 365.12 90.0 90.0 90.0 X Y Z -0.017792173 0.02924714 0.0001607504 0.0021572465 6.52 6.52 6.52 0.00542 AUTHOR Cryo-CLEM/cryo-ET was used to target IRE1a fused to fluorescent protein mNeonGreen (mNG) in U2OS cells. Helical symmetry applied using sym=H2.5:2:45:5 with --keep=0.9 --maxalt=50.0 --mask=Auto emd_23060_msk_1.map