3IF7: Calmodulin

Structure of Calmodulin complexed with its first endogenous inhibitor, sphingosylphosphorylcholine. Determined by X-ray diffraction at 1.6 Å resolution. Released 30 Jun 2010.

Method: X-ray diffraction
Resolution: 1.6 Å
Organism: Bos taurus
Chains: 1
Atoms: 1,256
Mol. weight: 18.74 kDa
Ligands: CA, SPU
Released: 30 Jun 2010

Explore 3IF7 in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

3IF7 contains 8 α-helices and 4 β-strands across 1 chain. 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	65-74	10
α-helix	82-92	11
β-strand	99-100	2	2
α-helix	102-111	10
α-helix	118-128	11
β-strand	136-137	2	2
α-helix	138-145	8

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
Calmodulin	A	protein	148	Bos taurus	P62157 (AlphaFold model)

Sequence of entity 1 (A), FASTA

>3IF7_1 Calmodulin (chains A)
ADQLTEEQIAEFKEAFSLFDKDGDGTITTKELGTVMRSLGQNPTEAELQDMINEVDADGN
GTIDFPEFLTMMARKMKDTDSEEEIREAFRVFDKDGNGYISAAELRHVMTNLGEKLTDEE
VDEMIREADIDGDGQVNYEEFVQMMTAK

Ligands and cofactors

ID	Name	Formula	Copies
CA	Calcium ion	Ca	4
SPU	2-{[(R)-{[(2S,3R,4E)-2-amino-3-hydroxyoctadec-4-en-1-yl]oxy}(hydroxy)phosphoryl…	C23 H50 N2 O5 P	4

Primary citation

Structure and mechanism of calmodulin binding to a signaling sphingolipid reveal new aspects of lipid-protein interactions. Kovacs, E., Harmat, V., Toth, J. et al. FASEB J (2010) 24:3829-3839. DOI 10.1096/fj.10-155614 · PubMed

Other PDB entries of the same protein (UniProt P62157 (AlphaFold model), which also has an AlphaFold model), best resolution first:

1FW4 1.7 Å, Crystal structure of E. Coli fragment TR2C from calmodulin to 1.7 a resolution
1PRW 1.7 Å, Crystal structure of bovine brain Ca++ calmodulin in a compact form
1CDM 2.0 Å, Modulation of calmodulin plasticity in molecular recognition on the basis of X-ray…
1CM1 2.0 Å, Motions of calmodulin-single-conformer refinement
1CM4 2.0 Å, Motions of calmodulin-four-conformer refinement
1LIN 2.0 Å, Calmodulin complexed with trifluoperazine (1:4 complex)
1XA5 2.12 Å, Structure of Calmodulin in complex with KAR-2, a bis-indol alkaloid
2F2O 2.17 Å, Structure of calmodulin bound to a calcineurin peptide: a new way of making an old…
1QIW 2.3 Å, Calmodulin complexed with N-(3,3,-diphenylpropyl)-N'-[1-R-(3,4-bis-butoxyphenyl)-ethyl]-p…
2FOT 2.45 Å, Crystal structure of the complex between calmodulin and alphaII-spectrin
2F2P 2.6 Å, Structure of calmodulin bound to a calcineurin peptide: a new way of making an old…
1QIV 2.64 Å, Calmodulin complexed with N-(3,3,-diphenylpropyl)-N'-[1-R-(3,4-bis-butoxyphenyl)-ethyl]-p…

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