7SIM: PDB entry 7SIM

Structure of positive allosteric modulator-free active human calcium-sensing receptor. Determined by electron microscopy at 2.7 Å resolution. Released 19 Jan 2022.

Method: Electron microscopy
Resolution: 2.7 Å
Organism: Homo sapiens
Chains: 2
Atoms: 12,826
Mol. weight: 204.78 kDa
Ligands: NAG, TCR, CA, CLR
Released: 19 Jan 2022

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

Secondary structure: helices and β-sheets

7SIM contains 82 α-helices and 76 β-strands across 2 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.

Chain A: 41 helices, 38 β-strands

Element	Residues	Length	Sheet
β-strand	25-28	4	1
β-strand	32-38	7	1
β-strand	41	1	2
β-strand	44	1	3
α-helix	54-59	6
β-strand	60	1	3
β-strand	63	1	2
α-helix	65-83	19
β-strand	93-99	7	1
α-helix	104-114	11
α-helix	116-120	5
α-helix	136-137	2
β-strand	138-142	5	1
α-helix	147-159	13
β-strand	164-166	3	1
α-helix	172-175	4
β-strand	183-185	3	1
α-helix	191-203	13
β-strand	208-214	7	4
α-helix	219-232	14
α-helix	235	1
β-strand	236-243	8	4
α-helix	249-261	13
β-strand	266-270	5	4
α-helix	273-286	14
β-strand	292-295	4	4
α-helix	296	1
α-helix	308-310	3
α-helix	311-314	4
β-strand	318-321	4	4
β-strand	325	1	5
α-helix	330-335	6
β-strand	345	1	1
α-helix	348-356	9
β-strand	359	1	6
β-strand	394	1	6
α-helix	401-403	3
β-strand	414	1	5
α-helix	416-435	20
α-helix	445-447	3
α-helix	452-454	3
α-helix	457-465	9
β-strand	468-470	3	7
β-strand	476-478	3	7
β-strand	489-496	8	4
β-strand	503-511	9	4
α-helix	516	1
β-strand	521-523	3	4
α-helix	525-527	3
β-strand	530	1	8
β-strand	534	1	8
α-helix	537-539	3
α-helix	544-547	4
β-strand	550-554	5	9
α-helix	555	1
β-strand	563-567	5	9
α-helix	568-569	2
β-strand	572-573	2	10
α-helix	582	1
β-strand	583-584	2	10
α-helix	585	1
β-strand	589-591	3	11
β-strand	598-600	3	11
α-helix	601	1
β-strand	602-604	3	12
β-strand	606	1	13
α-helix	611-636	26
α-helix	641-645	5
α-helix	648-668	21
β-strand	670	1	13
α-helix	674-678	5
α-helix	681-702	22
α-helix	723-745	23
β-strand	749-753	5	12
β-strand	760-766	7	12
α-helix	770-793	24
α-helix	803-820	18
α-helix	823-825	3
α-helix	831-860	30

Chain B: 41 helices, 38 β-strands

Element	Residues	Length	Sheet
β-strand	25-28	4	14
β-strand	32-38	7	14
β-strand	41	1	15
β-strand	44	1	16
α-helix	54-59	6
β-strand	60	1	16
β-strand	63	1	15
α-helix	65-83	19
β-strand	93-99	7	14
α-helix	104-114	11
α-helix	116-120	5
β-strand	140-142	3	14
α-helix	147-159	13
β-strand	164-166	3	14
α-helix	172-175	4
β-strand	183-185	3	14
α-helix	191-203	13
β-strand	208-214	7	17
α-helix	219-231	13
α-helix	235	1
β-strand	236-243	8	17
α-helix	249-261	13
β-strand	266-270	5	17
α-helix	273-286	14
β-strand	292-295	4	17
α-helix	296	1
α-helix	308-310	3
α-helix	311-314	4
β-strand	318-321	4	17
α-helix	322-324	3
β-strand	325	1	18
α-helix	330-335	6
β-strand	345	1	14
α-helix	348-355	8
β-strand	359	1	19
β-strand	394	1	19
α-helix	401-403	3
β-strand	414	1	18
α-helix	416-435	20
α-helix	445-447	3
α-helix	452-454	3
α-helix	457-465	9
β-strand	468-470	3	20
β-strand	476-478	3	20
β-strand	489-496	8	17
β-strand	503-511	9	17
α-helix	516	1
β-strand	521-523	3	17
α-helix	525-527	3
β-strand	530	1	21
β-strand	534	1	21
α-helix	537-539	3
α-helix	544-547	4
β-strand	550-554	5	22
α-helix	555	1
β-strand	563-567	5	22
α-helix	568-569	2
β-strand	572-573	2	23
α-helix	582	1
β-strand	583-584	2	23
α-helix	585	1
β-strand	589-591	3	24
β-strand	598-600	3	24
α-helix	601	1
β-strand	602-604	3	25
β-strand	606	1	26
α-helix	611-636	26
α-helix	641-645	5
α-helix	648-668	21
β-strand	670	1	26
α-helix	674-678	5
α-helix	681-702	22
α-helix	723-745	23
β-strand	749-753	5	25
β-strand	760-766	7	25
α-helix	770-793	24
α-helix	803-820	18
α-helix	823-825	3
α-helix	831-860	30

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
Isoform 1 of Extracellular calcium-sensing receptor	A, B	protein	878	Homo sapiens	P41180 (AlphaFold model)

Sequence of entity 1 (A, B), FASTA

>7SIM_1 Isoform 1 of Extracellular calcium-sensing receptor (chains A, B)
MAFYSCCWVLLALTWHTSAYGPDQRAQKKGDIILGGLFPIHFGVAAKDQDLKSRPESVEC
IRYNFRGFRWLQAMIFAIEEINSSPALLPNLTLGYRIFDTCNTVSKALEATLSFVAQNKI
DSLNLDEFCNCSEHIPSTIAVVGATGSGVSTAVANLLGLFYIPQVSYASSSRLLSNKNQF
KSFLRTIPNDEHQATAMADIIEYFRWNWVGTIAADDDYGRPGIEKFREEAEERDICIDFS
ELISQYSDEEEIQHVVEVIQNSTAKVIVVFSSGPDLEPLIKEIVRRNITGKIWLASEAWA
SSSLIAMPQYFHVVGGTIGFALKAGQIPGFREFLKKVHPRKSVHNGFAKEFWEETFNCHL
QEGAKGPLPVDTFLRGHEESGDRFSNSSTAFRPLCTGDENISSVETPYIDYTHLRISYNV
YLAVYSIAHALQDIYTCLPGRGLFTNGSCADIKKVEAWQVLKHLRHLNFTNNMGEQVTFD
ECGDLVGNYSIINWHLSPEDGSIVFKEVGYYNVYAKKGERLFINEEKILWSGFSREVPFS
NCSRDCLAGTRKGIIEGEPTCCFECVECPDGEYSDETDASACNKCPDDFWSNENHTSCIA
KEIEFLSWTEPFGIALTLFAVLGIFLTAFVLGVFIKFRNTPIVKATNRELSYLLLFSLLC
CFSSSLFFIGEPQDWTCRLRQPAFGISFVLCISCILVKTNRVLLVFEAKIPTSFHRKWWG
LNLQFLLVFLCTFMQIVICVIWLYTAPPSSYRNQELEDEIIFITCHEGSLMALGFLIGYT
CLLAAICFFFAFKSRKLPENFNEAKFITFSMLIFFIVWISFIPAYASTYGKFVSAVEVIA
ILAASFGLLACIFFNKIYIILFKPSRNTIEDYKDDDDK

Ligands and cofactors

ID	Name	Formula	Copies
NAG	2-acetamido-2-deoxy-beta-D-glucopyranose	C8 H15 N O6	2
TCR	Cyclomethyltryptophan	C12 H12 N2 O2	2
CA	Calcium ion	Ca	8
CLR	Cholesterol	C27 H46 O	8
PO4	Phosphate ion	O4 P	2

Primary citation

Symmetric activation and modulation of the human calcium-sensing receptor. Park, J., Zuo, H., Frangaj, A. et al. Proc Natl Acad Sci U S A (2021) 118. DOI 10.1073/pnas.2115849118 · PubMed

Other PDB entries of the same protein (UniProt P41180 (AlphaFold model), which also has an AlphaFold model), best resolution first:

5FBK 2.1 Å, Crystal structure of the extracellular domain of human calcium sensing receptor
7M3G 2.5 Å, Asymmetric Activation of the Calcium Sensing Receptor Homodimer
5K5S 2.6 Å, Crystal structure of the active form of human calcium-sensing receptor extracellular…
5FBH 2.7 Å, Crystal structure of the extracellular domain of human calcium sensing receptor with…
7SIL 2.7 Å, Structure of positive allosteric modulator-bound active human calcium-sensing receptor
8WPG 2.7 Å, Human calcium-sensing receptor bound with cinacalcet in detergent
7M3F 2.8 Å, Asymmetric Activation of the Calcium Sensing Receptor Homodimer
8SZF 2.8 Å, Cryo-EM structure of cinacalcet-bound active-state human calcium-sensing receptor CaSR…
9C1P 2.8 Å, Structure of Calcium-Sensing Receptor in complex with positive allosteric modulator '6218
9C2F 2.8 Å, Structure of Calcium-Sensing Receptor in complex with positive allosteric modulator '54149
7E6T 3.0 Å, Structural insights into the activation of human calcium-sensing receptor
5K5T 3.1 Å, Crystal structure of the inactive form of human calcium-sensing receptor extracellular…

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