3som

X-ray diffraction
2.4Å resolution

crystal structure of human MMACHC

Released:

Function and Biology Details

Reactions catalysed:
2 cob(II)alamin-[cyanocobalamin reductase] + 2 hydrogen cyanide + NADP(+) = 2 cyanocob(III)alamin + 2 [cyanocobalamin reductase] + NADPH
An alkylcobalamin + [alkylcobalamin reductase] + glutathione = cob(I)alamin-[alkylcobalamin reductase] + an S-alkylglutathione
Biochemical function:
Biological process:
Cellular component:

Structure analysis Details

Assembly composition:
monomeric (preferred)
PDBe Complex ID:
PDB-CPX-195250 (preferred)
Entry contents:
1 distinct polypeptide molecule
Macromolecule:
Cyanocobalamin reductase / alkylcobalamin dealkylase Chains: A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P
Molecule details ›
Chains: A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P
Length: 286 amino acids
Theoretical weight: 32.43 KDa
Source organism: Homo sapiens
Expression system: Escherichia coli
UniProt:
  • Canonical: Q9Y4U1 (Residues: 1-282; Coverage: 100%)
Gene name: MMACHC
Sequence domains: Methylmalonic aciduria and homocystinuria type C family

Ligands and Environments

1 modified residue:

Experiments and Validation Details

Entry percentile scores
X-ray source: DIAMOND BEAMLINE I24
Spacegroup: P1
Unit cell:
a: 71.664Å b: 71.96Å c: 300.055Å
α: 88.53° β: 85.25° γ: 83.76°
R-values:
R R work R free
0.183 0.182 0.206
Expression system: Escherichia coli