Literature summary for 4.1.1.31 extracted from

OLeary, B.; Fedosejevs, E.T.; Hill, A.T.; Bettridge, J.; Park, J.; Rao, S.K.; Leach, C.A.; Plaxton, W.C.
Tissue-specific expression and post-translational modifications of plant- and bacterial-type phosphoenolpyruvate carboxylase isozymes of the castor oil plant, Ricinus communis L (2011), J. Exp. Bot., 62, 5485-5495.

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Localization

Localization	Comment	Organism	GeneOntology No.	Textmining
cytosol	-	Ricinus communis	5829	-

Molecular Weight [Da]

Molecular Weight [Da]	Molecular Weight Maximum [Da]	Comment	Organism
107000	-	4 * 107000, PTPC, SDS-PAGE	Ricinus communis
118000	-	x * 118000, BTPC, SDS-PAGE	Ricinus communis

Organism

Organism	UniProt	Comment	Textmining
Ricinus communis	-	cultivar Baker 296	-

Posttranslational Modification

Posttranslational Modification	Comment	Organism
phosphoprotein	PTPC of castor oil seeds is activated by phosphorylation at Ser-11 during endosperm development	Ricinus communis
ubiquitination	PTPC of castor oil seeds is inhibited by monoubiquitination at Lys-628 during germination	Ricinus communis

Purification (Commentary)

Purification (Comment)	Organism
butyl-Sepharose column chromatography	Ricinus communis

Source Tissue

Source Tissue	Comment	Organism	Textmining
leaf	BTPC is present in leaf buds and young expanding leaves, but undetectable in fully expanded leaves	Ricinus communis	-
additional information	BTPC is abundant in the inner integument, cotyledon, and endosperm of developing seeds	Ricinus communis	-
seedling	occurs at low levels in roots and cotyledons of germinated seeds	Ricinus communis	-

Substrates and Products (Substrate)

Substrates	Comment Substrates	Organism	Products	Comment (Products)	Rev.	Reac.
additional information	BTPC tightly interacts with co-expressed PTPC to form the allosterically-desensitized class-2 PEPC heteromeric complex	Ricinus communis	?	-	?
phosphoenolpyruvate + HCO3-	-	Ricinus communis	phosphate + oxaloacetate	-	?

Subunits

Subunits	Comment	Organism
?	x * 118000, BTPC, SDS-PAGE	Ricinus communis
homotetramer	4 * 107000, PTPC, SDS-PAGE	Ricinus communis

Synonyms

Synonyms	Comment	Organism
bacterial-type phosphoenolpyruvate carboxylase	-	Ricinus communis
BTPC	-	Ricinus communis
PEPC	-	Ricinus communis
plant-type phosphoenolpyruvate carboxylase	-	Ricinus communis
PTPC	-	Ricinus communis

General Information

General Information	Comment	Organism
physiological function	BTPC and thus class-2 PEPC up-regulation is a distinctive feature of rapidly growing and/or biosynthetically active tissues that require a large anaplerotic flux from phosphoenolpyruvate to replenish tricarboxylic acid cycle C-skeletons being withdrawn for anabolism	Ricinus communis

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Release 2023.1 (January 2023)