Structure of PDB 1a4i Chain B

Receptor sequence
>1a4iB (length=295) Species: 9606 (Homo sapiens) [Search protein sequence]
APAEILNGKEISAQIRARLKNQVTQLKEQVPGFTPRLAILQVGNRDDSNL
YINVKLKAAEEIGIKATHIKLPRTTTESEVMKYITSLNEDSTVHGFLVQL
PLDSENSINTEEVINAIAPEKDVDGLTSINAGRLARGDLNDCFIPCTPKG
CLELIKETGVPIAGRHAVVVGRSKIVGAPMHDLLLWNNATVTTCHSKTAH
LDEEVNKGDILVVATGQPEMVKGEWIKPGAIVIDCGINYVPDDKKPNGRK
VVGDVAYDEAKERASFITPVPGGVGPMTVAMLMQSTVESAKRFLE
3D structure
PDB1a4i The 3-D structure of a folate-dependent dehydrogenase/cyclohydrolase bifunctional enzyme at 1.5 A resolution.
ChainB
Resolution1.5 Å
3D
structure
Catalytic site residues are labeled in the structure
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Enzymatic activity
Catalytic site (original residue number in PDB) S49 K56 Q100 D125
Catalytic site (residue number reindexed from 1) S48 K55 Q99 D124
Enzyme Commision number 1.5.1.5: methylenetetrahydrofolate dehydrogenase (NADP(+)).
3.5.4.9: methenyltetrahydrofolate cyclohydrolase.
6.3.4.3: formate--tetrahydrofolate ligase.
Interaction with ligand
Site
#		 Ligand Ligand
chain		 Binding residues on receptor
(original residue number in PDB)		 Binding residues on receptor
(residue number reindexed from 1)		 Binding affinity
BS01 NDP B G172 R173 S174 V177 H196 S197 A215 T216 G217 Q218 M221 C236 I238 G171 R172 S173 V176 H195 S196 A214 T215 G216 Q217 M220 C235 I237
Gene Ontology
Molecular Function
GO:0003824 catalytic activity
GO:0004488 methylenetetrahydrofolate dehydrogenase (NADP+) activity

View graph for
Molecular Function
External links
PDB RCSB:1a4i, PDBe:1a4i, PDBj:1a4i
PDBsum1a4i
PubMed9519408
UniProtP11586|C1TC_HUMAN C-1-tetrahydrofolate synthase, cytoplasmic (Gene Name=MTHFD1)

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