1YVE | pdb_00001yve

ACETOHYDROXY ACID ISOMEROREDUCTASE COMPLEXED WITH NADPH, MAGNESIUM AND INHIBITOR IPOHA (N-HYDROXY-N-ISOPROPYLOXAMATE)


Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

ChainsDomain InfoClassFoldSuperfamilyFamilyDomainSpeciesProvenance Source (Version)
A [auth I]d1yvei1 All alpha proteins 6-phosphogluconate dehydrogenase C-terminal domain-like 6-phosphogluconate dehydrogenase C-terminal domain-like Acetohydroxy acid isomeroreductase (ketol-acid reductoisomerase, KARI) Class II ketol-acid reductoisomerase spinach (Spinacia oleracea ) [TaxId: 3562 ], SCOPe (2.08)
A [auth I]d1yvei2 Alpha and beta proteins (a/b) NAD(P)-binding Rossmann-fold domains NAD(P)-binding Rossmann-fold domains 6-phosphogluconate dehydrogenase-like, N-terminal domain Class II ketol-acid reductoisomerase (KARI) spinach (Spinacia oleracea ) [TaxId: 3562 ], SCOPe (2.08)
B [auth J]d1yvej1 All alpha proteins 6-phosphogluconate dehydrogenase C-terminal domain-like 6-phosphogluconate dehydrogenase C-terminal domain-like Acetohydroxy acid isomeroreductase (ketol-acid reductoisomerase, KARI) Class II ketol-acid reductoisomerase spinach (Spinacia oleracea ) [TaxId: 3562 ], SCOPe (2.08)
B [auth J]d1yvej2 Alpha and beta proteins (a/b) NAD(P)-binding Rossmann-fold domains NAD(P)-binding Rossmann-fold domains 6-phosphogluconate dehydrogenase-like, N-terminal domain Class II ketol-acid reductoisomerase (KARI) spinach (Spinacia oleracea ) [TaxId: 3562 ], SCOPe (2.08)
C [auth K]d1yvek1 All alpha proteins 6-phosphogluconate dehydrogenase C-terminal domain-like 6-phosphogluconate dehydrogenase C-terminal domain-like Acetohydroxy acid isomeroreductase (ketol-acid reductoisomerase, KARI) Class II ketol-acid reductoisomerase spinach (Spinacia oleracea ) [TaxId: 3562 ], SCOPe (2.08)
C [auth K]d1yvek2 Alpha and beta proteins (a/b) NAD(P)-binding Rossmann-fold domains NAD(P)-binding Rossmann-fold domains 6-phosphogluconate dehydrogenase-like, N-terminal domain Class II ketol-acid reductoisomerase (KARI) spinach (Spinacia oleracea ) [TaxId: 3562 ], SCOPe (2.08)
D [auth L]d1yvel1 All alpha proteins 6-phosphogluconate dehydrogenase C-terminal domain-like 6-phosphogluconate dehydrogenase C-terminal domain-like Acetohydroxy acid isomeroreductase (ketol-acid reductoisomerase, KARI) Class II ketol-acid reductoisomerase spinach (Spinacia oleracea ) [TaxId: 3562 ], SCOPe (2.08)
D [auth L]d1yvel2 Alpha and beta proteins (a/b) NAD(P)-binding Rossmann-fold domains NAD(P)-binding Rossmann-fold domains 6-phosphogluconate dehydrogenase-like, N-terminal domain Class II ketol-acid reductoisomerase (KARI) spinach (Spinacia oleracea ) [TaxId: 3562 ], SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
A [auth I]SCOP2B Superfamily6-phosphogluconate dehydrogenase-like 8017592 3000048 SCOP2B (2022-06-29)
B [auth J]SCOP2B Superfamily6-phosphogluconate dehydrogenase-like 8017592 3000048 SCOP2B (2022-06-29)
C [auth K]SCOP2B Superfamily6-phosphogluconate dehydrogenase-like 8017592 3000048 SCOP2B (2022-06-29)
D [auth L]SCOP2B Superfamily6-phosphogluconate dehydrogenase-like 8017592 3000048 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
A [auth I]IlvCe1yveI1 A: alpha arraysX: 6-phosphogluconate dehydrogenase C-terminal domain-like (From Topology)H: 6-phosphogluconate dehydrogenase C-terminal domain-like (From Topology)T: 6-phosphogluconate dehydrogenase C-terminal domain-likeF: IlvCECOD (1.6)
A [auth I]IlvNe1yveI2 A: a/b three-layered sandwichesX: Rossmann-likeH: Rossmann-relatedT: NAD(P)-binding Rossmann-fold domainsF: IlvNECOD (1.6)
B [auth J]IlvCe1yveJ1 A: alpha arraysX: 6-phosphogluconate dehydrogenase C-terminal domain-like (From Topology)H: 6-phosphogluconate dehydrogenase C-terminal domain-like (From Topology)T: 6-phosphogluconate dehydrogenase C-terminal domain-likeF: IlvCECOD (1.6)
B [auth J]IlvNe1yveJ2 A: a/b three-layered sandwichesX: Rossmann-likeH: Rossmann-relatedT: NAD(P)-binding Rossmann-fold domainsF: IlvNECOD (1.6)
C [auth K]IlvCe1yveK1 A: alpha arraysX: 6-phosphogluconate dehydrogenase C-terminal domain-like (From Topology)H: 6-phosphogluconate dehydrogenase C-terminal domain-like (From Topology)T: 6-phosphogluconate dehydrogenase C-terminal domain-likeF: IlvCECOD (1.6)
C [auth K]IlvNe1yveK2 A: a/b three-layered sandwichesX: Rossmann-likeH: Rossmann-relatedT: NAD(P)-binding Rossmann-fold domainsF: IlvNECOD (1.6)
D [auth L]IlvCe1yveL1 A: alpha arraysX: 6-phosphogluconate dehydrogenase C-terminal domain-like (From Topology)H: 6-phosphogluconate dehydrogenase C-terminal domain-like (From Topology)T: 6-phosphogluconate dehydrogenase C-terminal domain-likeF: IlvCECOD (1.6)
D [auth L]IlvNe1yveL2 A: a/b three-layered sandwichesX: Rossmann-likeH: Rossmann-relatedT: NAD(P)-binding Rossmann-fold domainsF: IlvNECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A [auth I],
B [auth J],
C [auth K],
D [auth L]
PF07991Acetohydroxy acid isomeroreductase, NADPH-binding domain (KARI_N)Acetohydroxy acid isomeroreductase, NADPH-binding domain- Family
A [auth I],
B [auth J],
C [auth K],
D [auth L]
PF01450Ketol-acid reductoisomerase, C-terminal domain (KARI_C)Ketol-acid reductoisomerase, C-terminal domainKetol-acid reductoisomerase (KARI; EC:1.1.1.86), also known as acetohydroxy acid isomeroreductase (AHIR or AHAIR), catalyses the conversion of acetohydroxy acids into dihydroxy valerates in the second step of the biosynthetic pathway for the essent ...Ketol-acid reductoisomerase (KARI; EC:1.1.1.86), also known as acetohydroxy acid isomeroreductase (AHIR or AHAIR), catalyses the conversion of acetohydroxy acids into dihydroxy valerates in the second step of the biosynthetic pathway for the essential branched-chain amino acids valine, leucine, and isoleucine [1, 2, 3, 4, 5, 6]. KARI is present only in bacteria, fungi, and plants, but not in animals. KARIs are divided into two classes on the basis of sequence length and oligomerisation state. Class I KARIs are ~340 amino acid residues in length and include all fungal KARIs, whereas class II KARIs are ~490 residues long and include all plant KARIs. Bacterial KARIs can be either class I or class II. KARIs are composed of two types of domains, an N-terminal Rossmann fold domain and one or two C-terminal knotted domains. Two intertwinned knotted domains are required for function, and in the short-chain or class I KARIs, each polypeptide chain has one knotted domain. As a result, dimerization of two monomers forms two complete KARI active sites. In the long-chain or class II KARIs, a duplication of the knotted domain has occurred and, as a result, the protein does not require dimerisation to complete its active site [1, 2, 3, 4, 5, 6]. The alpha-helical KARI C-terminal knotted domain can be described as a six-helix core in which helices coil like cable threads around each other, thus forming a bundle [1, 2, 3, 4, 5].
Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A [auth I],
B [auth J],
C [auth K],
D [auth L]
ACETOHYDROXY ACID ISOMEROREDUCTASE

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

ChainsEnzyme NameDescriptionCatalytic Residues
ketol-acid reductoisomerase  M-CSA #890

Ketol-acid reductoisomerase (KARI) is a Mg(2+) -dependent enzyme in the branched-chain amino acid biosynthesis pathway. KARI catalyses two steps in the biosynthesis of branched-chain amino acids. The reaction involves an Mg(II) dependent alkyl migration followed by an NADPH-dependent reduction of the 2-keto group.

Defined by 3 residues: LYS:C-181 [auth K-252]ASP:C-244 [auth K-315]GLU:C-248 [auth K-319]
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