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3  structures 652  species 1  interaction 1567  sequences 33  architectures

Family: PLDc (PF00614)

Summary: Phospholipase D Active site motif

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This is the Wikipedia entry entitled "Phospholipase D". More...

Phospholipase D Edit Wikipedia article

phospholipase D
Identifiers
EC number 3.1.4.4
CAS number 9001-87-0
Databases
IntEnz IntEnz view
BRENDA BRENDA entry
ExPASy NiceZyme view
KEGG KEGG entry
MetaCyc metabolic pathway
PRIAM profile
PDB structures RCSB PDB PDBe PDBsum
Gene Ontology AmiGO / EGO

Phospholipase D (EC 3.1.4.4, lipophosphodiesterase II, lecithinase D, choline phosphatase) (PLD) is an enzyme of the phospholipase superfamily. Phospholipases are widely occurring, and can be found in a wide range of organisms, including bacteria, yeast, plants, animals, and viruses.[1][2] Phospholipase D’s principal substrate is phosphatidylcholine, which it hydrolyzes to produce the signal molecule phosphatidic acid (PA), and soluble choline. Plants contain numerous genes that encode various PLD isoenzymes, with molecular weights ranging from 90-125 kDa.[3] Mammalian cells encode two isoforms of phospholipase D: PLD1 and PLD2.[4] Phospholipase D is an important player in many physiological processes, including membrane trafficking, cytoskeletal reorganization, receptor-mediated endocytosis, exocytosis, and cell migration.[5] Through these processes, it has been further implicated in the pathophysiology of multiple diseases: in particular the progression of Parkinson’s and Alzheimer’s, as well as various cancers.[3][5]

Discovery

PLD-type activity was first reported in 1947 by Donald J. Hanahan and I.L. Chaikoff.[1] It was not until 1975, however, that the hydrolytic mechanism of action was elucidated in mammalian cells. Plant isoforms of PLD were first purified from cabbage and castor bean; PLDα was ultimately cloned and characterized from a variety of plants, including rice, corn, and tomato.[1] Plant PLDs have been cloned in three isoforms: PLDα, PLDβ, and PLDγ.[6] More than half a century of biochemical studies have implicated phospholipase D and PA activity in a wide range of physiological processes and diseases, including inflammation, diabetes, phagocytosis, neuronal & cardiac signaling, and oncogenesis.[7]

Function

Strictly speaking, phospholipase D is a transphosphatidylase: it mediates the exchange of polar headgroups covalently attached to membrane-bound lipids. Utilizing water as a nucleophile, this enzyme catalyzes the cleavage of the phosphodiester bond in structural phospholipids such as phosphatidylcholine and phosphatidylethanolamine.[3] The products of this hydrolysis are the membrane-bound lipid phosphatidic acid (PA), and choline, which diffuses into the cytosol. As choline has little second messenger activity, PLD activity is mostly transduced by the production of PA.[5][8] PA is heavily involved in intracellular signal transduction.[9] In addition, some members of the PLD superfamily may employ primary alcohols such as ethanol or 1-butanol in the cleavage of the phospholipid, effectively catalyzing the exchange the polar lipid headgroup.[3][6] Other members of this family are able hydrolyze other phospholipid substrates, such as cardiolipin, or even the phosphodiester bond constituting the backbone of DNA.[4]

Phosphatidic acid

Main article: Phosphatidic acid

Many of phospholipase D’s cellular functions are mediated by its principal product, phosphatidic acid (PA). PA is a negatively charged phospholipid, whose small head group promotes membrane curvature.[4] It is thus thought to facilitate membrane-vesicle fusion and fission in a manner analogous to clathrin-mediated endocytosis.[4] PA may also recruit proteins that contain its corresponding binding domain, a region characterized by basic amino acid-rich regions. Additionally, PA can be converted into a number of other lipids, such as lysophosphatidic acid (lyso-PA) or diacylglycerol, signal molecules which have a multitude of effects on downstream cellular pathways.[6] PA and its lipid derivatives are implicated in myriad processes that include intracellular vesicle trafficking, endocytosis, exocytosis, actin cytoskeleton dynamics, cell proliferation differentiation, and migration.[4]

Figure 1. A model of the ARF-dependent activation of phospholipase D, and a proposed scheme for vesicle endocytosis. In this model, ARF activates phospholipase D (PLD), recruiting it to the plasma membrane. Hydrolysis of phosphatidylcholine (PC) by ARF-activated PLD produces phosphatidic acid (PA). PA subsequently recruits molecules that shape the inner face of the lipid bilayer, facilitating vesicle formation. Local enrichment of acidic phospholipids help recruit adaptor proteins (AP) and coat proteins (CP) to the membrane, initiating the budding of the vesicle. Vesicle fission is ultimately mediated by dynamin, which itself is a downstream effector of PA.

Mammalian PLD directly interacts with kinases like PKC, ERK, TYK and controls the signalling indicating that PLD is activated by these kinases.[10] As choline is very abundant in the cell, PLD activity does not significantly affect choline levels, and choline is unlikely to play any role in signalling.

Phosphatidic acid is a signal molecule and acts to recruit SK1 to membranes. PA is extremely short lived and is rapidly hydrolysed by the enzyme phosphatidate phosphatase to form diacylglycerol (DAG). DAG may also be converted to PA by DAG kinase. Although PA and DAG are interconvertible, they do not act in the same pathways. Stimuli that activate PLD do not activate enzymes downstream of DAG and vice versa.

It is possible that, though PA and DAG are interconvertible, separate pools of signalling and non-signalling lipids may be maintained. Studies have suggested that DAG signalling is mediated by polyunsaturated DAG while PLD derived PA is monounsaturated or saturated. Thus functional saturated/monounsaturated PA can be degraded by hydrolysing it to form non-functional saturated/monounsaturated DAG while functional polyunsaturated DAG can be degraded by converting it into non-functional polyunsaturated PA.[11][12][13]

A lysophospholipase D called autotaxin was recently identified as having an important role in cell-proliferation through its product, lysophosphatidic acid (LPA).

Structure

Phospholipase D Active site motif
Identifiers
Symbol PLDc
Pfam PF00614
InterPro IPR001736
SMART SM00155
PROSITE PDOC50035
SCOP 1byr
SUPERFAMILY 1byr
CDD cd00138

Plant and animal PLDs have a consistent molecular structure, characterized by sites of catalysis surrounded by an assortment of regulatory sequences.[3] The active site of PLDs consists of four highly conserved amino acid sequences (I-IV), of which motifs II and IV are particularly conserved. These structural domains contain the distinguishing catalytic sequence HxxxxxxxKxD (HKD), where H, K, and D are the amino acids histidine (H), lysine (K), aspartic acid (D), while x represents nonconservative amino acids.[3][4] These two HKD motifs confer hydrolytic activity to PLD, and are critical for its enzymatic activity both in vitro and in vivo.[4][7] Hydrolysis of the phosphodiester bond occurs when these HKD sequences are in the correct proximity.

Human proteins containing this motif include:

PC-hydrolyzing PLD is a homologue of cardiolipin synthase,[14][15] phosphatidylserine synthase, bacterial PLDs, and viral proteins. Each of these appears to possess a domain duplication which is apparent by the presence of two HKD motifs containing well-conserved histidine, lysine, and asparagine residues which may contribute to the active site aspartic acid. An Escherichia coli endonuclease (nuc) and similar proteins appear to be PLD homologues but possess only one of these motifs.[16][17][18][19]

PLD genes additionally encode highly conserved regulatory domains: the pbox consensus sequence (PX), the pleckstrin homology domain (PH), and a binding site for phosphatidylinositol 4,5-bisphosphate (PIP2).[2]

Mechanism of action

PLD-catalyzed hydrolysis has been proposed to occur in two stages via a ‘ping-pong’ mechanism. In this scheme, the histidine residues of each HKD motif successively attack the phospholipid substrate. Functioning as nucleophiles, the constituent imidazole moieties of the histidines form transient covalent bonds with the phospholipid, producing a short-lived intermediate that can be easily hydrolyzed by water in a subsequent step.[3][9]

Isoforms

Two major isoforms of phospholipase D has been identified in mammalian cells: PLD1 and PLD2 (53% sequence homology),[20] each encoded by distinct genes.[4] PLD activity appears to be present in most cell types, with the possible exceptions of peripheral leukocytes and other lymphocytes.[7] Both PLD isoforms require PIP2 as a cofactor for activity.[4] PLD1 and PLD2 exhibit different subcellular localizations that dynamically change in the course of signal transduction. PLD activity has been observed within the plasma membrane, cytosol, ER, and Golgi complex.[7]

PLD1

Main article: PLD1

PLD1 is a 120 kDa protein that is mainly located on the inner membranes of cells. It is primarily present at the Golgi complex, endosomes, lysosomes, and secretory granules.[4] Upon the binding of an extracellular stimulus, PLD1 is transported to the plasma membrane. Basal PLD1 activity is low however, and in order to transduce the extracellular signal, it must first be activated by proteins such as Arf, Rho, Rac, and protein kinase C.[4][5][8]

phospholipase D1, phosphatidylcholine-specific
Identifiers
Symbol PLD1
Entrez 5337
HUGO 9067
OMIM 602382
RefSeq NM_002662
UniProt Q13393
Other data
Locus Chr. 3 q26

PLD2

Main article: PLD2

In contrast, PLD2 is a 106 kDa protein that primarily localizes to the plasma membrane, residing in light membrane lipid rafts.[3][5] It has high intrinsic catalytic activity, and is only weakly activated by the above molecules.[3]

phospholipase D2
Identifiers
Symbol PLD2
Entrez 5338
HUGO 9068
OMIM 602384
RefSeq NM_002663
UniProt O14939
Other data
Locus Chr. 17 p13.3

Regulation

The activity of phospholipase D is extensively regulated by hormones, neurotransmitters, lipids, small monomeric GTPases, and other small molecules that bind to their corresponding domains on the enzyme.[3] In most cases, signal transduction is mediated through production of phosphatidic acid, which functions as a secondary messenger.[3]

Specific phospholipids are regulators of PLD activity in plant and animal cells.[1][3] Most PLDs require phosphatidylinositol 4,5-bisphosphate (PIP2), as a cofactors for activity.[2][3] PIP2 and other phosphoinositides are important modifiers of cytoskeletal dynamics and membrane transport. PLDs regulated by these phospholipids are commonly involved in intracellular signal transduction.[3] Their activity is dependent upon the binding of these phosphoinositides near the active site.[3] In plants and animals, this binding site is characterized by the presence of a conserved sequence of basic and aromatic amino acids.[3][9] In plants such as Arabidopsis thaliana, this sequence is constituted by a RxxxxxKxR motif together with its inverted repeat, where R is arginine and K is lysine. Its proximity to the active site ensures high level of PLD1 and PLD2 activity, and promotes the translocation of PLD1 to target membranes in response to extracellular signals.[3]

C2 Domain

Main article: C2 domain

Calcium acts as a cofactor in PLD isoforms that contain the C2 domain. Binding of Ca2+ to the C2 domain leads to conformational changes in the enzyme that strengthen enzyme-substrate binding, while weakening the association with phosphoinositides. In some plant isoenzymes, such as PLDβ, Ca2+ may bind directly to the active site, indirectly increasing its affinity for the substrate by strengthening the binding of the activator PIP2.[3]

PX Domain

Main article: PX domain

The pbox consensus sequence (PX) is thought to mediate the binding of additional phosphatidylinositol phosphates, in particular, phosphatidylinositol 5-phosphate (PtdIns5P), a lipid thought to be required for endocytosis, may help facilitate the reinternalization of PLD1 from the plasma membrane.[1]

PH Domain

Main article: PH domain

The highly conserved Pleckstrin homology domain (PH) is a structural domain approximately 120 amino acids in length. It binds phosphatidylinositides such as phosphatidylinositol (3,4,5)-trisphosphate (PIP3) and phosphatidylinositol (4,5)-bisphosphate (PIP2). It may also bind heterotrimeric G proteins via their βγ-subunit. Binding to this domain is also thought to facilitate the re-internalization of the protein by increasing its affinity to endocytotic lipid rafts.[1]

Interactions with small GTPases

Main article: Small GTPase

In animal cells, small protein factors are important additional regulators of PLD activity. These small monomeric GTPases are members of the Rho and ARF families of the Ras superfamily. Some of these proteins, such as Rac1, Cdc42, and RhoA, allosterically activate mammalian PLD1, directly increasing its activity. In particular, the translocation of cytosolic ADP-ribosylation factor (ARF) to the plasma membrane is essential for PLD activation.[1][3]

Physiological & pathophysiological roles

In cancer

Phospholipase D is a regulator of several critical cellular processes, including vesicle transport, endocytosis, exocytosis, cell migration, and mitosis.[5] Dysregulation of these processes is commonplace in carcinogenesis,[5] and in turn, abnormalities in PLD expression have been implicated in the progression of several types cancer.[2][4] A driver mutation conferring elevated PLD2 activity has been observed in several malignant breast cancers.[4] Elevated PLD expression has also been correlated with tumor size in colorectal carcinoma, gastric carcinoma, and renal cancer.[4][5] However, the molecular pathways through which PLD drives cancer progression remain unclear.[4] One potential hypothesis casts a critical role for phospholipase D in the activation of mTOR, a suppressor of cancer cell apoptosis.[4] The ability of PLD to suppress apoptosis in cells with elevated tyrosine kinase activity makes it a candidate oncogene in cancers where such expression is typical.[5]

In neurodegenerative diseases

Phospholipase D may also play an important pathophysiological role in the progression of neurodegenerative diseases, primarily through its capacity as a signal transducer in indispensable cellular processes like cytoskeletal reorganization and vesicle trafficking.[20] Dysregulation of PLD by the protein α-synuclein has been shown to lead to the specific loss of dopaminergic neurons in mammals. α-synuclein is the primary structural component of Lewy bodies, protein aggregates that are the hallmarks of Parkinson’s disease.[4] Disinhibition of PLD by α-synuclein may contribute to Parkinson's deleterious phenotype.[4]

Abnormal PLD activity has also been suspected in Alzheimer’s disease, where it has been observed to interact with presenilin 1 (PS-1), the principal component of the γ-secretase complex responsible for the enzymatic cleavage of amyloid precursor protein (APP). Extracellular plaques of the product β-amyloid are a defining feature of Alzheimer’s diseased brains.[4] Action of PLD1 on PS-1 has been shown to affect the intracellular trafficking of the amyloid precursor to this complex.[4][20] Phospholipase D3 (PLD3), a non-classical and poorly characterized member of the PLD superfamily, has also been associated with the pathogenesis of this disease.[21]

Gallery

References

  1. ^ a b c d e f g Jenkins GM, Frohman MA (October 2005). "Phospholipase D: a lipid centric review.". Cell Mol Life Sci. 62 (19-20): 2305–16. doi:10.1007/s00018-005-5195-z. PMID 16143829. 
  2. ^ a b c d Exton JH (2002). "Phospholipase D-structure, regulation and function.". Rev Physiol Biochem Pharmacol. 1 (144): 1–94. doi:10.1007/BFb0116585. PMID 11987824. 
  3. ^ a b c d e f g h i j k l m n o p q r s Kolesnikov YS, Nokhrina KP, Kretynin SV, Volotovski ID, Martinec J, Romanov GA, Kravets VS. (January 2012). "Molecular structure of phospholipase D and regulatory mechanisms of its activity in plant and animal cells.". Biochemistry (Mosc). 77 (1): 1–14. doi:10.1134/S0006297912010014. PMID 22339628. 
  4. ^ a b c d e f g h i j k l m n o p q r s t Peng X., M. A. Frohman (February 2012). "Mammalian Phospholipase D Physiological and Pathological Roles.". Acta Physiologica 204 (2): 219–226. doi:10.1111/j.1748-1716.2011.02298.x. PMID 21447092. 
  5. ^ a b c d e f g h i Foster DA (September 2003). "Phospholipase D in cell proliferation and cancer.". Mol Cancer Res. 1 (11): 789–800. doi:10.2174/157436206778226941. PMID 14517341. 
  6. ^ a b c Banno Y (2002). "Regulation and Possible Role of Mammalian Phospholipase D in Cellular Functions.". J. Biochem. 131 (3): 301–306. doi:10.1093/oxfordjournals.jbchem.a003103. 
  7. ^ a b c d McDermott M, Wakelam MJ, Morris AJ. (February 2004). "Phospholipase D.". Biochem Cell Biol. 82 (1): 225–53. doi:10.1139/o03-079. PMID 15052340. 
  8. ^ a b Balboa MA, Firestein BL, Godson C, Bell KS, Insel PA. (April 1994). "Protein kinase C alpha mediates phospholipase D activation by nucleotides and phorbol ester in Madin-Darby canine kidney cells. Stimulation of phospholipase D is independent of activation of polyphosphoinositide-specific phospholipase C and phospholipase A2.". J Biol Chem. 269 (14): 10511–6. PMID 8144636. 
  9. ^ a b c Leiros I, Secundo F, Zambonelli C, Servi S, Hough E. (2002). "The first crystal structure of a phospholipase D.". Rev Physiol Biochem Pharmacol. 1 (144): 1–94. doi:10.1016/S0969-2126(00)00150-7. PMID 10873862. 
  10. ^ Paruch S, El-Benna J, Djerdjouri B, Marullo S, Périanin A (January 2006). "A role of p44/42 mitogen-activated protein kinases in formyl-peptide receptor-mediated phospholipase D activity and oxidant production". FASEB J. 20 (1): 142–4. doi:10.1096/fj.05-3881fje. PMID 16253958. 
  11. ^ Bocckino S, Blackmore P, Wilson P, Exton J (1987). "Phosphatidate accumulation in hormone-treated hepatocytes via a phospholipase D mechanism". J Biol Chem 262 (31): 15309–15. PMID 3117799. 
  12. ^ Bocckino S, Wilson P, Exton J (1987). "Ca2+-mobilizing hormones elicit phosphatidylethanol accumulation via phospholipase D activation". FEBS Lett 225 (1-2): 201–4. doi:10.1016/0014-5793(87)81157-2. PMID 3319693. 
  13. ^ Hodgkin M, Pettitt T, Martin A, Michell R, Pemberton A, Wakelam M (1998). "Diacylglycerols and phosphatidates: which molecular species are intracellular messengers?". Trends Biochem Sci 23 (6): 200–4. doi:10.1016/S0968-0004(98)01200-6. PMID 9644971. 
  14. ^ M. Nowicki and M. Frentzen (2005). "Cardiolipin synthase of Arabidopsis thaliana". FEBS Letters 579 (10): 2161–2165. doi:10.1016/j.febslet.2005.03.007. PMID 15811335. 
  15. ^ M. Nowicki (2006). "Characterization of the Cardiolipin Synthase from Arabidopsis thaliana". Ph.D. thesis, RWTH-Aachen University. 
  16. ^ Ponting CP, Kerr ID (1996). "A novel family of phospholipase D homologues that includes phospholipid synthases and putative endonucleases: identification of duplicated repeats and potential active site residues". Protein Sci. 5 (5): 914–922. doi:10.1002/pro.5560050513. PMC 2143407. PMID 8732763. 
  17. ^ Koonin EV (1996). "A duplicated catalytic motif in a new superfamily of phosphohydrolases and phospholipid synthases that includes poxvirus envelope proteins". Trends Biochem. Sci. 21 (7): 242–243. doi:10.1016/0968-0004(96)30024-8. PMID 8755242. 
  18. ^ Wang X, Xu L, Zheng L (1994). "Cloning and expression of phosphatidylcholine-hydrolyzing phospholipase D from Ricinus communis L". J. Biol. Chem. 269 (32): 20312–20317. PMID 8051126. 
  19. ^ Singer WD, Brown HA, Sternweis PC (1997). "Regulation of eukaryotic phosphatidylinositol-specific phospholipase C and phospholipase D". Annu. Rev. Biochem. 66: 475–509. doi:10.1146/annurev.biochem.66.1.475. PMID 9242915. 
  20. ^ a b c Lindsley CW, Brown HA. (January 2012). "Phospholipase D as a therapeutic target in brain disorders.". Neuropsychopharmacology 37 (1): 301–2. doi:10.1038/npp.2011.178. PMID 22157867. 
  21. ^ Cruchaga et al. (2013). "Rare coding variants in the phospholipase D3 gene confer risk for Alzheimer’s disease". Nature. 

External links

This article incorporates text from the public domain Pfam and InterPro IPR001734

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Phospholipase D Active site motif Provide feedback

Phosphatidylcholine-hydrolysing phospholipase D (PLD) isoforms are activated by ADP-ribosylation factors (ARFs). PLD produces phosphatidic acid from phosphatidylcholine, which may be essential for the formation of certain types of transport vesicles or may be constitutive vesicular transport to signal transduction pathways. PC-hydrolysing PLD is a homologue of cardiolipin synthase, phosphatidylserine synthase, bacterial PLDs, and viral proteins. Each of these appears to possess a domain duplication which is apparent by the presence of two motifs containing well-conserved histidine, lysine, and/or asparagine residues which may contribute to the active site. aspartic acid. An E. coli endonuclease (nuc) and similar proteins appear to be PLD homologues but possess only one of these motifs. The profile contained here represents only the putative active site regions, since an accurate multiple alignment of the repeat units has not been achieved.

Literature references

  1. Ponting CP, Kerr ID; , Protein Sci 1996;5:914-922.: A novel family of phospholipase D homologues that includes phospholipid synthases and putative endonucleases: identification of duplicated repeats and potential active site residues. PUBMED:8732763 EPMC:8732763

  2. Koonin EV; , Trends Biochem Sci 1996;21:242-243.: A duplicated catalytic motif in a new superfamily of phosphohydrolases and phospholipid synthases that includes poxvirus envelope proteins. PUBMED:8755242 EPMC:8755242

  3. Wang X, Xu L, Zheng L; , J Biol Chem 1994;269:20312-20317.: Cloning and expression of phosphatidylcholine-hydrolyzing phospholipase D from Ricinus communis L. PUBMED:8051126 EPMC:8051126

  4. Singer WD, Brown HA, Sternweis PC; , Annu Rev Biochem 1997;66:475-509.: Regulation of eukaryotic phosphatidylinositol-specific phospholipase C and phospholipase D. PUBMED:9242915 EPMC:9242915

  5. Stuckey JA, Dixon JE; , Nat Struct Biol 1999;6:278-284.: Crystal structure of a phospholipase D family member. PUBMED:10074947 EPMC:10074947


Internal database links

External database links

This tab holds annotation information from the InterPro database.

InterPro entry IPR001736

Phosphatidylcholine-hydrolysing phospholipase D (PLD) isoforms are activated by ADP-ribosylation factors (ARFs). PLD produces phosphatidic acid from phosphatidylcholine, which may be essential for the formation of certain types of transport vesicles or may be constitutive vesicular transport to signal transduction pathways. PC-hydrolysing PLD is a homologue of cardiolipin synthase, phosphatidylserine synthase, bacterial PLDs, and viral proteins. Each of these appears to possess a domain duplication which is apparent by the presence of two motifs containing well-conserved histidine, lysine, and/or asparagine residues which may contribute to the active site aspartic acid. An Escherichia coli endonuclease (nuc) and similar proteins appear to be PLD homologues but possess only one of these motifs [PUBMED:8732763, PUBMED:8755242, PUBMED:8051126, PUBMED:9242915].

Gene Ontology

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Domain organisation

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Pfam Clan

This family is a member of clan PLD (CL0479), which has the following description:

This superfamily includes proteins that are related to Phospholiase D.

The clan contains the following 8 members:

DUF1669 PLDc PLDc_2 PLDc_3 PP_kinase_C RE_NgoFVII Regulator_TrmB Tyr-DNA_phospho

Alignments

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(176)
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(219)
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(475)
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RP75
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(6708)
Meta
(176)
RP15
(219)
RP35
(475)
RP55
(677)
RP75
(833)
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  Seed
(48)
Full
(1567)
Representative proteomes NCBI
(6708)
Meta
(176)
RP15
(219)
RP35
(475)
RP55
(677)
RP75
(833)
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Trees

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Curation and family details

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Curation View help on the curation process

Seed source: Alignment kindly provided by SMART
Previous IDs: none
Type: Family
Author: Ponting C, Schultz J, Bork P
Number in seed: 48
Number in full: 1567
Average length of the domain: 29.50 aa
Average identity of full alignment: 40 %
Average coverage of the sequence by the domain: 4.30 %

HMM information View help on HMM parameters

HMM build commands:
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 23193494 -E 1000 --cpu 4 HMM pfamseq
Model details:
Parameter Sequence Domain
Gathering cut-off 21.9 21.9
Trusted cut-off 21.9 21.9
Noise cut-off 21.8 21.8
Model length: 28
Family (HMM) version: 17
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Species distribution

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Interactions

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PLDc

Structures

For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the PDBe group, to allow us to map Pfam domains onto UniProt sequences and three-dimensional protein structures. The table below shows the structures on which the PLDc domain has been found. There are 3 instances of this domain found in the PDB. Note that there may be multiple copies of the domain in a single PDB structure, since many structures contain multiple copies of the same protein seqence.

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