Annotations: 2CJ4

Crystal Structure of a Cell Wall Invertase Inhibitor from Tobacco at pH 4.6

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
B	d2cj4b_	All alpha proteins	Bromodomain-like	Plant invertase/pectin methylesterase inhibitor	Plant invertase/pectin methylesterase inhibitor	automated matches	COMMON TOBACCO (Nicotiana tabacum ) [TaxId: 4097 ],	SCOPe (2.08)
A	d2cj4a_	All alpha proteins	Bromodomain-like	Plant invertase/pectin methylesterase inhibitor	Plant invertase/pectin methylesterase inhibitor	automated matches	COMMON TOBACCO (Nicotiana tabacum ) [TaxId: 4097 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B	SCOP2B Superfamily	Plant invertase/pectin methylesterase inhibitor	8038935	3000860	SCOP2B (2022-06-29)
A	SCOP2 Family	Plant invertase/pectin methylesterase inhibitor	8026556	4000644	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Plant invertase/pectin methylesterase inhibitor	8038935	3000860	SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	ACOX	e2cj4B1	A: a/b three-layered sandwiches	X: ETN0001 domain-like	H: Flavivirus capsid protein C	T: Flavivirus capsid protein C	F: ACOX	ECOD (v294.1)
A	PMEI	e2cj4A1	A: alpha bundles	X: Bromodomain-like	H: Plant invertase/pectin methylesterase inhibitor	T: Plant invertase/pectin methylesterase inhibitor	F: PMEI	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	1.20.140.40	Mainly Alpha	Up-down Bundle	Butyryl-CoA Dehydrogenase, subunit A	domain 3	CATH (4.3.0)
A	1.20.140.40	Mainly Alpha	Up-down Bundle	Butyryl-CoA Dehydrogenase, subunit A	domain 3	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF04043	Plant invertase/pectin methylesterase inhibitor (PMEI)	Plant invertase/pectin methylesterase inhibitor	This domain inhibits pectin methylesterases (PMEs) and invertases through formation of a non-covalent 1:1 complex [1]. It has been implicated in the regulation of fruit development, carbohydrate metabolism and cell wall extension (see [2]). It may al ...	This domain inhibits pectin methylesterases (PMEs) and invertases through formation of a non-covalent 1:1 complex [1]. It has been implicated in the regulation of fruit development, carbohydrate metabolism and cell wall extension (see [2]). It may also be involved in inhibiting microbial pathogen PMEs. It has been observed that it is often expressed as a large inactive preprotein [1]. It is also found at the N-termini of PMEs predicted from DNA sequences (personal obs:C Yeats), suggesting that both PMEs and their inhibitor are expressed as a single polyprotein and subsequently processed. It has two disulphide bridges and is mainly alpha-helical [2].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	INVERTASE INHIBITOR	enzyme regulator activity molecular function inhibitor activity molecular function regulator activity enzyme inhibitor activity	plant-type cell wall organization cellular component organization plant-type cell wall organization or biogenesis cell wall modification cell wall organization or biogenesis cell wall organization cellular process cellular component organization or biogenesis plant-type cell wall modification external encapsulating structure organization	cellular anatomical structure external encapsulating structure plant-type cell wall extracellular region cell wall

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR006501	Pectinesterase inhibitor domain	Domain
A, B	IPR035513	Invertase/pectin methylesterase inhibitor domain superfamily	Homologous Superfamily
A, B	IPR034087	Cell wall/vacuolar inhibitor of fructosidase	Family

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RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.