2F3Y: Calmodulin/IQ domain complex

Calmodulin/IQ domain complex. Determined by X-ray diffraction at 1.45 Å resolution. Released 27 Dec 2005.

Method: X-ray diffraction
Resolution: 1.45 Å
Organism: Homo sapiens
Chains: 2
Atoms: 1,662
Mol. weight: 19.74 kDa
Ligands: CA, MG
Released: 27 Dec 2005

Explore 2F3Y in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

2F3Y contains 9 α-helices and 4 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: 8 helices, 4 β-strands

Element	Residues	Length	Sheet
α-helix	6-19	14
β-strand	26-27	2	1
α-helix	29-38	10
α-helix	45-55	11
β-strand	63-64	2	1
α-helix	65-77	13
α-helix	83-92	10
β-strand	99-100	2	2
α-helix	102-111	10
α-helix	118-128	11
β-strand	136-137	2	2
α-helix	138-146	9

Chain B: 1 helix, 0 β-strands

Element	Residues	Length	Sheet
α-helix	1666-1680	15

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
Calmodulin	A	protein	148	Homo sapiens	P0DP23 (AlphaFold model)
Voltage-dependent L-type calcium channel alpha-1C subunit	B	protein	21		Q13936 (AlphaFold model)

Sequence of entity 1 (A), FASTA

>2F3Y_1 Calmodulin (chains A)
ADQLTEEQIAEFKEAFSLFDKDGDGTITTKELGTVMRSLGQNPTEAELQDMINEVDADGN
GTIDFPEFLTMMARKMKDTDSEEEIREAFRVFDKDGNGYISAAELRHVMTNLGEKLTDEE
VDEMIREADIDGDGQVNYEEFVQMMTAK

Sequence of entity 2 (B), FASTA

>2F3Y_2 Voltage-dependent L-type calcium channel alpha-1C subunit (chains B)
KFYATFLIQEYFRKFKKRKEQ

Ligands and cofactors

ID	Name	Formula	Copies
CA	Calcium ion	Ca	4
MG	Magnesium ion	Mg	2

Primary citation

Structure of Calmodulin Bound to the Hydrophobic IQ Domain of the Cardiac Ca(v)1.2 Calcium Channel. Fallon, J.L., Halling, D.B., Hamilton, S.L. et al. Structure (2005) 13:1881-1886. DOI 10.1016/j.str.2005.09.021 · PubMed

Other PDB entries of the same protein (UniProt P0DP23 (AlphaFold model), which also has an AlphaFold model), best resolution first:

9MXD 1.17 Å, Human E104A calmodulin:MLCK RM20 complex
7BF1 1.24 Å, Ca2+-Calmodulin in complex with peptide from brain-type creatine kinase in extended 1:2…
6XXX 1.25 Å, 1.25 Angstrom crystal structure of Ca/CaM A102V:RyR2 peptide complex
4DJC 1.35 Å, 1.35 A crystal structure of the NaV1.5 DIII-IV-Ca/CaM complex
7BF2 1.43 Å, Ca2+-Calmodulin in complex with human muscle form creatine kinase peptide in extended…
2W73 1.45 Å, High-resolution structure of the complex between calmodulin and a peptide from…
4LZX 1.5 Å, Complex of IQCG and Ca2+-free CaM
5V03 1.58 Å, A positive allosteric modulator binding pocket in SK2 ion channels is shared by Riluzole…
9MVW 1.58 Å, Crystal structure of S101F calmodulin - CaM:RM20 analog complex
2F3Z 1.6 Å, Calmodulin/IQ-AA domain complex
6M7H 1.6 Å, Structure of calmodulin with KN93
6DAD 1.65 Å, 1.65 Angstrom crystal structure of the N97I Ca/CaM:CaV1.2 IQ domain complex

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