1X8Z

Crystal structure of a pectin methylesterase inhibitor from Arabidopsis thaliana

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	d1x8za1	All alpha proteins	Bromodomain-like	Plant invertase/pectin methylesterase inhibitor	Plant invertase/pectin methylesterase inhibitor	Pectin methylesterase inhibitor 1, PMEI1	thale cress (Arabidopsis thaliana ) [TaxId: 3702 ],	SCOPe (2.08)
A	d1x8za2	Artifacts	Tags	Tags	Tags	N-terminal Tags	thale cress (Arabidopsis thaliana ) [TaxId: 3702 ],	SCOPe (2.08)
B	d1x8zb_	All alpha proteins	Bromodomain-like	Plant invertase/pectin methylesterase inhibitor	Plant invertase/pectin methylesterase inhibitor	Pectin methylesterase inhibitor 1, PMEI1	thale cress (Arabidopsis thaliana ) [TaxId: 3702 ],	SCOPe (2.08)
C	d1x8zc1	All alpha proteins	Bromodomain-like	Plant invertase/pectin methylesterase inhibitor	Plant invertase/pectin methylesterase inhibitor	Pectin methylesterase inhibitor 1, PMEI1	thale cress (Arabidopsis thaliana ) [TaxId: 3702 ],	SCOPe (2.08)
C	d1x8zc2	Artifacts	Tags	Tags	Tags	N-terminal Tags	thale cress (Arabidopsis thaliana ) [TaxId: 3702 ],	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	8043780	3000860	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Plant invertase/pectin methylesterase inhibitor	8043780	3000860	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Plant invertase/pectin methylesterase inhibitor	8043780	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	e1x8zA1	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)
B	PMEI	e1x8zB1	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)
C	PMEI	e1x8zC1	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)
B	1.20.140.40	Mainly Alpha	Up-down Bundle	Butyryl-CoA Dehydrogenase, subunit A	domain 3	CATH (4.3.0)
C	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, C	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, C	invertase/pectin methylesterase inhibitor family protein	enzyme regulator activity molecular function inhibitor activity pectinesterase inhibitor activity molecular function regulator activity enzyme inhibitor activity	developmental process multi-multicellular organism process multicellular organismal process cellular developmental process pollination developmental cell growth developmental growth reproductive process growth unidimensional cell growth cell development cell tip growth developmental process involved in reproduction cell growth cell morphogenesis developmental process multi-multicellular organism process multicellular organismal process cellular developmental process pollination developmental cell growth developmental growth reproductive process growth unidimensional cell growth cell development cell tip growth developmental process involved in reproduction cell growth cell morphogenesis developmental growth involved in morphogenesis anatomical structure morphogenesis pollen tube growth cell differentiation anatomical structure development cellular process pollen tube development	cellular anatomical structure extracellular region apoplast cell projection growing cell tip pollen tube pollen tube tip cell tip cell pole plasma membrane bounded cell projection site of polarized growth

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C	IPR034086	Pectinesterase inhibitor, plant	Family
A, B, C	IPR052421	Plant Cell Wall Enzyme Inhibitor	Family
A, B, C	IPR006501	Pectinesterase inhibitor domain	Domain
A, B, C	IPR035513	Invertase/pectin methylesterase inhibitor domain superfamily	Homologous Superfamily

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.