6xiw

Cryo-EM structure of the sodium leak channel NALCN-FAM155A complex

Method: ELECTRON MICROSCOPY

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1. Protein Identity and Related Structures Protein Identity & Related Structures

Sodium leak channel non-selective protein

Homo sapiens

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	Transmembrane protein FAM155A × 1 （B1AL88） 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 (1S)-2-{[(2-AMINOETHOXY)(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL STEARATE × 5 (1R)-2-{[{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL (11E)-OCTADEC-11-ENOATE × 2 CHOLESTEROL HEMISUCCINATE × 3 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	NALCN_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–1738； UniProt 1–1738

Transmembrane protein FAM155A

Homo sapiens

UniProt B1AL88

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 2	Sodium leak channel non-selective protein × 1 （Q8IZF0） 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 (1S)-2-{[(2-AMINOETHOXY)(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL STEARATE × 5 (1R)-2-{[{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL (11E)-OCTADEC-11-ENOATE × 2 CHOLESTEROL HEMISUCCINATE × 3 water × 2	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	F155A_HUMAN
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–458； UniProt 1–458

The page prioritizes protein identity, the current assembly, associated components, oligomeric state and cross-PDB links. Chain mapping and sequence ranges are retained as data evidence. Internal IDs, import timestamps and assembly operation expressions are maintenance fields and are not shown here.

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2. Structure Basics 2. Structure Basics

Entry ID entry_id	6xiw
Deposition date deposition_date	2020-06-22
Structure title title	Cryo-EM structure of the sodium leak channel NALCN-FAM155A complex
Keywords keywords	ion channel, membrane protein, complex, cysteine rich domain; MEMBRANE PROTEIN
Experimental Method method	ELECTRON MICROSCOPY

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3. Official assembly/model SAXS Official SAXS Profiles

This page reads only the latest assembly calculations. Every curve maps to an explicit PDB entry, official biological assembly and coordinate model.

6xiw__assembly_1__model_1

Assembly 1 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

6xiw__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

6xiw__assembly_1__model_1 | P(r) · Pending

P(r) will be calculated and displayed separately for the same assembly/model.

Rg（Guinier）	38.40 Å
Rg (electron density)	37.30 Å
Total Rg	37.78 Å
Atom count	11814
Residues	1399
Excluded volume	216060 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`6xiw__assembly_1__model_1`	dimeric （2）	Success	4.1.3-1-20251215 (887e7ef)	View Download

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4. Crystallography and Experiment 4. Crystallography & Experiment

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5. Entities and Polymers Entities & Polymers (7)

Entity 1 Entity 1 polymer

Description description	Sodium leak channel non-selective protein
Molecular weight formula_weight	206341.6 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	11819

MLKRKQSSRVEAQPVTDFGPDESLSDNADILWINKPWVHSLLRICAIISVISVCMNTPMTFEHYPPLQYVTFTLDTLLMFLYTAEMIAKMHIRGIVKGDSSYVKDRWCVFDGFMVFCLWVSLVLQVFEIADIVDQMSPWGMLRIPRPLIMIRAFRIYFRFELPRTRITNILKRSGEQIWSVSIFLLFFLLLYGILGVQMFGTFTYHCVVNDTKPGNVTWNSLAIPDTHCSPELEEGYQCPPGFKCMDLEDLGLSRQELGYSGFNEIGTSIFTVYEAASQEGWVFLMYRAIDSFPRWRSYFYFITLIFFLAWLVKNVFIAVIIETFAEIRVQFQQMWGSRSSTTSTATTQMFHEDAAGGWQLVAVDVNKPQGRAPACLQKMMRSSVFHMFILSMVTVDVIVAASNYYKGENFRRQYDEFYLAEVAFTVLFDLEALLKIWCLGFTGYISSSLHKFELLLVIGTTLHVYPDLYHSQFTYFQVLRVVRLIKISPALEDFVYKIFGPGKKLGSLVVFTASLLIVMSAISLQMFCFVEELDRFTTFPRAFMSMFQILTQEGWVDVMDQTLNAVGHMWAPVVAIYFILYHLFATLILLSLFVAVILDNLELDEDLKKLKQLKQSEANADTKEKLPLRLRIFEKFPNRPQMVKISKLPSDFTVPKIRESFMKQFIDRQQQDTCCLLRSLPTTSSSSCDHSKRSAIEDNKYIDQKLRKSVFSIRARNLLEKETAVTKILRACTRQRMLSGSFEGQPAKERSILSVQHHIRQERRSLRHGSNSQRISRGKSLETLTQDHSNTVRYRNAQREDSEIKMIQEKKEQAEMKRKVQEEELRENHPYFDKPLFIVGREHRFRNFCRVVVRARFNASKTDPVTGAVKNTKYHQLYDLLGLVTYLDWVMIIVTICSCISMMFESPFRRVMHAPTLQIAEYVFVIFMSIELNLKIMADGLFFTPTAVIRDFGGVMDIFIYLVSLIFLCWMPQNVPAESGAQLLMVLRCLRPLRIFKLVPQMRKVVRELFSGFKEIFLVSILLLTLMLVFASFGVQLFAGKLAKCNDPNIIRREDCNGIFRINVSVSKNLNLKLRPGEKKPGFWVPRVWANPRNFNFDNVGNAMLALFEVLSLKGWVEVRDVIIHRVGPIHGIYIHVFVFLGCMIGLTLFVGVVIANFNENKGTALLTVDQRRWEDLKSRLKIAQPLHLPPRPDNDGFRAKMYDITQHPFFKRTIALLVLAQSVLLSVKWDVEDPVTVPLATMSVVFTFIFVLEVTMKIIAMSPAGFWQSRRNRYDLLVTSLGVVWVVLHFALLNAYTYMMGACVIVFRFFSICGKHVTLKMLLLTVVVSMYKSFFIIVGMFLLLLCYAFAGVVLFGTVKYGENINRHANFSSAGKAITVLFRIVTGEDWNKIMHDCMVQPPFCTPDEFTYWATDCGNYAGALMYFCSFYVIIAYIMLNLLVAIIVENFSLFYSTEEDQLLSYNDLRHFQIIWNMVDDKREGVIPTFRVKFLLRLLRGRLEVDLDKDKLLFKHMCYEMERLHNGGDVTFHDVLSMLSYRSVDIRKSLQLEELLAREQLEYTIEEEVAKQTIRMWLKKCLKRIRAKQQQSCSIIHSLRESQQQELSRFLNPPSIETTQPSEDTNANSQDNSMQPETSSQQQLLSPTLSDRGGSRQDAADAGKPQRKFGQWRLPSAPKPISHSVSSVNLRFGGRTTMKSVVCKMNPMTDAASCGSEVKKWWTRQLTVESDESGDDLLDIGGGSGGWSHPQFEKGGGSGGGSGGSAWSHPQFEKGSGDYKDDDDKGNSDYKDDDDK

Source Source

Source organism organism	Homo sapiens
Common name common_name	Human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Homo sapiens

Entity 2 Entity 2 polymer

Description description	Transmembrane protein FAM155A
Molecular weight formula_weight	54205.0 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B

MTRGAWMCRQYDDGLKIWLAAPRENEKPFIDSERAQKWRLSLASLLFFTVLLSDHLWFCAEAKLTRARDKEHQQQQRQQQQQQQQQRQRQQQQQQRRQQEPSWPALLASMGESSPAAQAHRLLSASSSPTLPPSPGDGGGGGGKGNRGKDDRGKALFLGNSAKPVWRLETCYPQGASSGQCFTVENADAVCARNWSRGAAGGDGQEVRSKHPTPLWNLSDFYLSFCNSYTLWELFSGLSSPNTLNCSLDVVLKEGGEMTTCRQCVEAYQDYDHHAQEKYEEFESVLHKYLQSEEYSVKSCPEDCKIVYKAWLCSQYFEVTQFNCRKTIPCKQYCLEVQTRCPFILPDNDEVIYGGLSSFICTGLYETFLTNDEPECCDVRREEKSNNPSKGTVEKSGSCHRTSLTVSSATRLCNSRLKLCVLVLILLHTVLTASAAQNTAGLSFGGINTLEENSTNEEGGSGGSDYKDDDDKGNSDYKDDDDK

Source Source

Source organism organism	Homo sapiens
Common name common_name	Human
NCBI taxonomy ID ncbi_taxonomy_id	9606
Host organism host_organism	Homo sapiens

Entity 3 Entity 3 non-polymer

Description description	2-acetamido-2-deoxy-beta-D-glucopyranose
Molecular weight formula_weight	221.2 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 4 Entity 4 non-polymer

Description description	(1S)-2-{[(2-AMINOETHOXY)(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL STEARATE
Molecular weight formula_weight	720.0 kDa
Source method src_method	syn
Copy count entity_count	5

Entity 5 Entity 5 non-polymer

Description description	(1R)-2-{[{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL (11E)-OCTADEC-11-ENOATE
Molecular weight formula_weight	749.0 kDa
Source method src_method	syn
Copy count entity_count	2

Entity 6 Entity 6 non-polymer

Description description	CHOLESTEROL HEMISUCCINATE
Molecular weight formula_weight	486.7 kDa
Source method src_method	nat
Copy count entity_count	3

Entity 7 Entity 7 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	5

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Unit-cell length a length_a	1.000 Å
Unit-cell length b length_b	1.000 Å
Unit-cell length c length_c	1.000 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	—

Space group space_group	P 1
Space-group number int_tables_number	1
Crystal system crystal_system	—

Resolution resolution	2.80 Å
Resolution测定Method resolution_method	—
颗粒数 num_particles	365512

Cryo-EM structure of the sodium leak channel NALCN-FAM155A complex

1. Protein Identity and Related Structures Protein Identity & Related Structures

Sodium leak channel non-selective protein

State in the Current Structure

Other States of the Same Protein in the Database

Transmembrane protein FAM155A

State in the Current Structure

Other States of the Same Protein in the Database

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

6xiw__assembly_1__model_1

6xiw__assembly_1__model_1 | I(q)

6xiw__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

冷冻电镜 EM 3D

5. Entities and Polymers Entities & Polymers (7)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 water

7. Citations (1)

Cryo-EM structure of the sodium leak channel NALCN-FAM155A complex

1. Protein Identity and Related Structures Protein Identity & Related Structures

Sodium leak channel non-selective protein

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

Transmembrane protein FAM155A

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

6xiw__assembly_1__model_1

6xiw__assembly_1__model_1 | I(q)

6xiw__assembly_1__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

冷冻电镜 EM 3D

5. Entities and Polymers Entities & Polymers (7)

Entity 1 Entity 1 polymer

Polymer Polymer

Source Source

Entity 2 Entity 2 polymer

Polymer Polymer

Source Source

Entity 3 Entity 3 non-polymer

Entity 4 Entity 4 non-polymer

Entity 5 Entity 5 non-polymer

Entity 6 Entity 6 non-polymer

Entity 7 Entity 7 water

7. Citations (1)