1RJ1

Crystal Structure of a Cell Wall Invertase Inhibitor from Tobacco

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)
A	d1rj1a1	All alpha proteins	Bromodomain-like	Plant invertase/pectin methylesterase inhibitor	Plant invertase/pectin methylesterase inhibitor	Invertase inhibitor	common tobacco (Nicotiana tabacum ) [TaxId: 4097 ],	SCOPe (2.08)
A	d1rj1a2	Artifacts	Tags	Tags	Tags	N-terminal Tags	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)
A	SCOP2B Superfamily	Plant invertase/pectin methylesterase inhibitor	8038935	3000860	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	PMEI	e1rj1A1	A: alpha bundles	X: Bromodomain-like	H: Plant invertase/pectin methylesterase inhibitor (From Topology)	T: Plant invertase/pectin methylesterase inhibitor	F: PMEI	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
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	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	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	cell periphery cellular anatomical structure external encapsulating structure plant-type cell wall cell wall

InterPro: Protein Family Classification InterPro Database Homepage

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

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.