PARL

PARL
Identifiers
Aliases	PARL, PSARL, PSARL1, PSENIP2, RHBDS1, PRO2207, presenilin associated rhomboid like
External IDs	OMIM: 607858; MGI: 1277152; HomoloGene: 10239; GeneCards: PARL; OMA:PARL - orthologs
Gene location (Human) Chr. Chromosome 3 (human)[1] Band 3q27.1 Start 183,829,271 bp[1] End 183,884,933 bp[1]
Gene location (Mouse) Chr. Chromosome 16 (mouse)[2] Band 16 A3|16 12.4 cM Start 20,098,568 bp[2] End 20,121,137 bp[2]
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in monocyte olfactory zone of nasal mucosa thymus apex of heart muscle layer of sigmoid colon body of pancreas gastric mucosa putamen mucosa of transverse colon tibial arteries Top expressed in primary oocyte embryonic cell zygote secondary oocyte yolk sac epiblast otic vesicle proximal tubule epidermis zone of skin More reference expression data BioGPS More reference expression data
Gene ontology Molecular function peptidase activity serine-type peptidase activity protein binding hydrolase activity serine-type endopeptidase activity endopeptidase activity Cellular component integral component of membrane mitochondrial inner membrane membrane nucleus mitochondrion Biological process regulation of reactive oxygen species metabolic process regulation of protein targeting to mitochondrion regulation of proteolysis proteolysis membrane protein proteolysis regulation of mitochondrion organization mitochondrial calcium ion transmembrane transport Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 55486 381038 Ensembl ENSG00000175193 ENSMUSG00000033918 UniProt Q9H300 Q5XJY4 RefSeq (mRNA) NM_001037639 NM_001037640 NM_018622 NM_001324436 NM_001324437 NM_001324438 NM_001005767 RefSeq (protein) NP_001032728 NP_001311365 NP_001311366 NP_001311367 NP_061092 NP_001005767 Location (UCSC) Chr 3: 183.83 – 183.88 Mb Chr 16: 20.1 – 20.12 Mb PubMed search [3] [4]
Wikidata
View/Edit Human View/Edit Mouse

Presenilins-associated rhomboid-like protein, mitochondrial (PSARL),^[5] also known as PINK1/PGAM5-associated rhomboid-like protease (PARL),^[6] is an inner mitochondrial membrane protein that in humans is encoded by the PARL gene on chromosome 3.^[7] It is a member of the rhomboid family of intramembrane serine proteases.^[8] This protein is involved in signal transduction and apoptosis, as well as neurodegenerative diseases and type 2 diabetes.^[7][9]

Rhomboid family members share a conserved core of six transmembrane helices (TMHs), with the Ser and His residues required to form the catalytic dyad embedded in TMH-4 and TMH-6, respectively. This dyad is found deep below the membrane surface, which indicates that the hydrolysis of peptide bonds occurs within the hydrophobic phospholipid bilayer membrane. As a member of the Parl subfamily, PARL has an additional N-terminal TMH which may form a loop to the catalytic core. ^[10]

This gene encodes a mitochondrial integral membrane protein. Following proteolytic processing of this protein, a small peptide (P-beta) is formed and translocated to the nucleus. This gene may be involved in signal transduction via regulated intramembrane proteolysis of membrane-tethered precursor proteins. Variation in this gene has been associated with increased risk for type 2 diabetes. Alternative splicing results in multiple transcript variants encoding different isoforms.^[7]

Additionally, PARL is involved in apoptosis through its interactions with the mitochondrial GTPase optic atrophy 1 (OPA1) and the Bcl-2 family-related protein HAX1. OPA1 mainly regulates mitochondrial fusion in the mitochondrial inner membrane, but after proteolytic cleavage by PARL, its short, soluble form contributes to inhibiting apoptosis by slowing down cytochrome c release, and thus, proapoptotic signaling. Alternatively, PARL can inhibit apoptosis by coordinating with HAX1 to activate HtrA2 protease, thus preventing the accumulation of the proapoptotic Bax.^[9]

It has been shown that the p.S77N presenilin-associated rhomboid-like protein mutation is not a frequent cause of early-onset Parkinson's disease.^[11] Variation in the sequence and/or expression of the gene encoding presenilins-associated rhomboid-like protein (PSARL) may be an important new risk factor for type 2 diabetes and other components of the metabolic syndrome.^[12] Mutations in PARL may also be involved in Leber hereditary optic neuropathy by disrupting normal function of the mitochondria, thus promoting retinal ganglion cell death and neurodegeneration.^[9]

PARL has been shown to interact with:

• PINK1,^[13]
• OPA1,^[9] and
• HAX1.^[9]