Blast Analysis : gnl|CDD|197296

Analysis	rpsblast_cdd	Start	542
End	693	Strand	+
Length	152	Note	Gaps:4
Hit Coverage	73.93	Hit Length	211
Hit Pident	71.15	E Val	1e-67
Hit Description	cd09200 PLDc_pPLDbeta_2 Catalytic domain repeat 2 of plant beta-type phospholipase D. Catalytic domain repeat 2 of plant beta-type phospholipase D (PLDbeta EC 3.1.4.4). Plant PLDbeta is a phosphatidylinositol 4 5-bisphosphate (PIP2)-dependent PLD that possesses a regulatory calcium-dependent phospholipid-binding C2 domain in the N-terminus and requires nanomolar calcium and cytosolic factors for optimal activity. The C2 domain is unique to plant PLDs and is not present in animal or fungal PLDs. Sequence analysis shows that plant PLDbeta is evolutionarily divergent from alpha-type plant PLD and plant PLDbeta is more closely related to mammalian and yeast PLDs than to plant PLDalpha. Like other PLD enzymes the monomer of plant PLDbeta consists of two catalytic domains each of which contains one copy of the conserved HKD motif (H-x-K-x(4)-D where x represents any amino acid residue). Two HKD motifs from two domains form a single active site. Plant PLDbeta may utilize a common two-step ping-pong catalytic mechanism involving an enzyme-substrate intermediate to cleave phosphodiester bonds. The two histidine residues from the two HKD motifs play key roles in the catalysis. Upon substrate binding a histidine residue from one HKD motif could function as the nucleophile attacking the phosphodiester bond to create a covalent phosphohistidine intermediate while the other histidine residue from the second HKD motif could serve as a general acid stabilizing the leaving group.	Hit Pcons	8.97
Name	Qrob_P0204290.2

1 Protein

Protein Identifier	Organism . Name	Score	Score Type	Protein Description	Alias (in v1)	Code Enzyme	Gene Prediction Quality
Qrob_P0204290.2	Quercus robur	99.0	egn	(M=2) PF00168//PF00614 - C2 domain // Phospholipase D Active site motif		EC:3.1.4.4	validated

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