7ONL: Small-conductance mechanosensitive channel

Mechanosensitive channel MscS solubilized with DDM in closed conformation. Determined by electron microscopy at 3.9 Å resolution. Released 1 Sept 2021.

Method: Electron microscopy
Resolution: 3.9 Å
Organism: Escherichia coli (strain K12)
Chains: 7
Atoms: 13,923
Mol. weight: 223.96 kDa
Released: 1 Sept 2021

Explore 7ONL in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

7ONL contains 56 α-helices and 67 β-strands across 7 chains. Residue ranges use author residue numbering, as in the PDB file, from PDBe. To see them in 3D, choose the Cartoon representation with Secondary structure coloring: helices, sheets and coils get different colors.

Chains A and D: 8 helices, 10 β-strands

Element	Residues	Length	Sheet
α-helix	23-58	36
α-helix	63-89	27
α-helix	94-127	34
β-strand	135-138	4	1
β-strand	141-148	8	1
β-strand	152-156	5	1
β-strand	162-166	5	1
α-helix	167-171	5
β-strand	175-177	3	1
β-strand	183-192	10	2
α-helix	198-211	14
β-strand	222-228	7	2
β-strand	233-242	10	2
α-helix	243-245	3
α-helix	246-264	19
α-helix	268-270	3
β-strand	272-276	5	3
β-strand	278	1	4

Chains B and E: 8 helices, 10 β-strands

Element	Residues	Length	Sheet
α-helix	23-58	36
α-helix	63-89	27
α-helix	94-127	34
β-strand	135-138	4	1
β-strand	141-148	8	1
β-strand	152-156	5	1
β-strand	162-166	5	1
α-helix	167-171	5
β-strand	175-177	3	1
β-strand	183-192	10	5
α-helix	198-211	14
β-strand	222-228	7	5
β-strand	233-242	10	5
α-helix	243-245	3
α-helix	246-264	19
α-helix	268-270	3
β-strand	272-273	2	3
β-strand	274-278	5	4

Chains C, F and G: 8 helices, 9 β-strands

Element	Residues	Length	Sheet
α-helix	23-58	36
α-helix	63-89	27
α-helix	94-127	34
β-strand	135-138	4	1
β-strand	141-148	8	1
β-strand	152-156	5	1
β-strand	162-166	5	1
α-helix	167-171	5
β-strand	175-177	3	1
β-strand	183-192	10	6
α-helix	198-211	14
β-strand	222-228	7	6
β-strand	233-242	10	6
α-helix	243-245	3
α-helix	246-264	19
α-helix	268-270	3
β-strand	272-278	7	4

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
Small-conductance mechanosensitive channel	A, B, C, D, E, F, G	protein	294	Escherichia coli (strain K12)	P0C0S1 (AlphaFold model)

Sequence of entity 1 (A, B, C, D, E, F, G), FASTA

>7ONL_1 Small-conductance mechanosensitive channel (chains A, B, C, D, E, F, G)
MEDLNVVDSINGAGSWLVANQALLLSYAVNIVAALAIIIVGLIIARMISNAVNRLMISRK
IDATVADFLSALVRYGIIAFTLIAALGRVGVQTASVIAVLGAAGLAVGLALQGSLSNLAA
GVLLVMFRPFRAGEYVDLGGVAGTVLSVQIFSTTMRTADGKIIVIPNGKIIAGNIINFSR
EPVRRNEFIIGVAYDSDIDQVKQILTNIIQSEDRILKDREMTVRLNELGASSINFVVRVW
SNSGDLQNVYWDVLERIKREFDAAGISFPYPQMDVNFKRVKEDKAALEHHHHHH

Primary citation

Mechanosensitive channel gating by delipidation. Flegler, V.J., Rasmussen, A., Borbil, K. et al. Proc Natl Acad Sci U S A (2021) 118. DOI 10.1073/pnas.2107095118 · PubMed

Other PDB entries of the same protein (UniProt P0C0S1 (AlphaFold model), which also has an AlphaFold model), best resolution first:

7ONJ 2.3 Å, Mechanosensitive channel MscS solubilized with LMNG in open conformation
9E68 2.5 Å, Cryo-EM structure of MscS/YnaI chimera in DOPC nanodiscs
7OOA 2.7 Å, Mechanosensitive channel MscS solubilized with LMNG in open conformation with added lipid
9H2S 2.7 Å, a YnaI-MscS chimera in a closed conformation purified in DDM with additional lipids…
9H2V 2.8 Å, a YnaI-MscS chimera in an open conformation purified in DDM showing ligand-filled pockets
6RLD 2.9 Å, Structure of the mechanosensitive channel mscs embedded in the membrane bilayer
5AJI 2.99 Å, MscS D67R1 high resolution
6PWN 3.1 Å, MscS Nanodisc with N-terminal His-Tag
7OO0 3.1 Å, Mechanosensitive channel MscS solubilized with DDM in open conformation
7OO6 3.1 Å, Mechanosensitive channel MscS solubilized with DDM in closed conformation with added lipid
8DDJ 3.1 Å, Open MscS in PC14.1 Nanodiscs
6VYK 3.2 Å, Cryo-EM structure of mechanosensitive channel MscS in PC-18:1 nanodiscs

Browse structure collections

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