Summary: Phospholipase B
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Phospholipase B (PLB) catalyses the hydrolytic cleavage of both acylester bonds of glycerophospholipids. This family of PLB enzymes has been identified in mammals, flies and nematodes but not in yeast . In Drosophila this protein was named LAMA for laminin ancestor since it is expressed in the neuronal and glial precursors that surround the lamina .
Morgan CP, Insall R, Haynes L, Cockcroft S; , Biochem J 2004;382:441-449.: Identification of phospholipase B from Dictyostelium discoideum reveals a new lipase family present in mammals, flies and nematodes, but not yeast. PUBMED:15193148 EPMC:15193148
Perez SE, Steller H; , Mech Dev 1996;59:11-27.: Molecular and genetic analyses of lama, an evolutionarily conserved gene expressed in the precursors of the Drosophila first optic ganglion. PUBMED:8892229 EPMC:8892229
External database links
This tab holds annotation information from the InterPro database.
InterPro entry IPR007000
Phospholipase B (PLB) catalyses the hydrolytic cleavage of both acylester bonds of glycerophospholipids. This family of PLB enzymes has been identified in mammals, flies and nematodes but not in yeast [PUBMED:8892229]. In Drosophila this protein was named LAMA for laminin ancestor since it is expressed in the neuronal and glial precursors that surround the lamina [PUBMED:15193148].
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In the N-terminal nucleophile aminohydrolases (Ntn hydrolases) the N-terminal residue provides two catalytic groups, nucleophile and proton donor. These enzymes use the side chain of the amino-terminal residue, incorporated in a beta-sheet, as the nucleophile in the catalytic attack at the carbonyl carbon. The nucleophile is cysteine in GAT, serine in penicillin acylase, and threonine in the proteasome. All the enzymes share an unusual fold in which the nucleophile and other catalytic groups occupy equivalent sites. This fold provides both the capacity for nucleophilic attack and the possibility of autocatalytic processing .
The clan contains the following 14 members:AAT Asparaginase_2 CBAH DUF1933 DUF3700 G_glu_transpept GATase_2 GATase_4 GATase_6 GATase_7 Penicil_amidase Peptidase_C69 Phospholip_B Proteasome
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Curation and family details
|Seed source:||Pfam-B_5721 (release 7.6)|
|Author:||Finn RD, Mistry J, Wood V|
|Number in seed:||6|
|Number in full:||390|
|Average length of the domain:||411.50 aa|
|Average identity of full alignment:||27 %|
|Average coverage of the sequence by the domain:||85.60 %|
|HMM build commands:||
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 23193494 -E 1000 --cpu 4 HMM pfamseq
|Family (HMM) version:||8|
|Download:||download the raw HMM for this family|
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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 Phospholip_B domain has been found. There are 6 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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