6KAP: Hemoglobin subunit alpha

Carbonmonoxy human hemoglobin C in the R quaternary structure at 95 K: Light. Determined by X-ray diffraction at 1.45 Å resolution. Released 19 Feb 2020.

Method: X-ray diffraction
Resolution: 1.45 Å
Organism: Homo sapiens
Chains: 2
Atoms: 2,386
Mol. weight: 32.33 kDa
Ligands: CMO, HEM
Released: 19 Feb 2020

Explore 6KAP in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

6KAP contains 24 α-helices and 0 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: 11 helices, 0 β-strands

Element	Residues	Length
α-helix	4-17	14
α-helix	18-20	3
α-helix	21-35	15
α-helix	37-42	6
α-helix	53-71	19
α-helix	73-75	3
α-helix	76-79	4
α-helix	81-85	5
α-helix	86-90	5
α-helix	96-112	17
α-helix	119-136	18

Chain B: 13 helices, 0 β-strands

Element	Residues	Length
α-helix	5-15	11
α-helix	23-34	12
α-helix	36-41	6
α-helix	43-45	3
α-helix	51-56	6
α-helix	58-75	18
α-helix	81-84	4
α-helix	86-89	4
α-helix	90-95	6
α-helix	101-118	18
α-helix	119-121	3
α-helix	124-141	18
α-helix	143-145	3

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
Hemoglobin subunit alpha	A	protein	141	Homo sapiens	P69905 (AlphaFold model)
Hemoglobin subunit beta	B	protein	146	Homo sapiens	P68871 (AlphaFold model)

Sequence of entity 1 (A), FASTA

>6KAP_1 Hemoglobin subunit alpha (chains A)
VLSPADKTNVKAAWGKVGAHAGEYGAEALERMFLSFPTTKTYFPHFDLSHGSAQVKGHGK
KVADALTNAVAHVDDMPNALSALSDLHAHKLRVDPVNFKLLSHCLLVTLAAHLPAEFTPA
VHASLDKFLASVSTVLTSKYR

Sequence of entity 2 (B), FASTA

>6KAP_2 Hemoglobin subunit beta (chains B)
VHLTPKEKSAVTALWGKVNVDEVGGEALGRLLVVYPWTQRFFESFGDLSTPDAVMGNPKV
KAHGKKVLGAFSDGLAHLDNLKGTFATLSELHCDKLHVDPENFRLLGNVLVCVLAHHFGK
EFTPPVQAAYQKVVAGVANALAHKYH

Ligands and cofactors

ID	Name	Formula	Copies
CMO	Carbon monoxide	C O	2
HEM	Protoporphyrin IX containing FE	C34 H32 Fe N4 O4	2

Primary citation

Direct observation of ligand migration within human hemoglobin at work. Shibayama, N., Sato-Tomita, A., Ohki, M. et al. Proc Natl Acad Sci U S A (2020) 117:4741-4748. DOI 10.1073/pnas.1913663117 · PubMed

Other PDB entries of the same protein (UniProt P69905 (AlphaFold model), which also has an AlphaFold model), best resolution first:

2W72 1.07 Å, Deoxygenated structure of a distal site hemoglobin mutant plus xe
1IRD 1.25 Å, Crystal Structure of Human Carbonmonoxy-Haemoglobin at 1.25 A Resolution
2DN1 1.25 Å, 1.25A resolution crystal structure of human hemoglobin in the oxy form
2DN2 1.25 Å, 1.25A resolution crystal structure of human hemoglobin in the deoxy form
2DN3 1.25 Å, 1.25A resolution crystal structure of human hemoglobin in the carbonmonoxy form
7DY4 1.3 Å, High resolution crystal structure of hemoglobin M Boston.
6KA9 1.4 Å, Crosslinked alpha(Fe-CO)-beta(Ni) human hemoglobin A in the T quaternary structure at 95…
6KAO 1.4 Å, Carbonmonoxy human hemoglobin C in the R quaternary structure at 95 K: Dark
6LCW 1.4 Å, Crosslinked alpha(Ni)-beta(Ni) human hemoglobin A in the T quaternary structure at 95 K:…
6LCX 1.4 Å, Crosslinked alpha(Ni)-beta(Ni) human hemoglobin A in the T quaternary structure at 95 K:…
7DY3 1.4 Å, High resolution crystal structure of hemoglobin M Iwate.
3S66 1.4 Å, Structures and oxygen affinities of crystalline human hemoglobin C (beta6 Lys) in the R…

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