Selected-GenAtlas references SOURCE GeneCards NCBI Gene Swiss-Prot Orphanet Ensembl
HGNC UniGene Nucleotide OMIM UCSC
Home Page
Symbol MCOLN1 contributors: mct/pgu - updated : 23-12-2013
HGNC name mucolipin 1
HGNC id 13356
  • AAs 37-49 are a new PDCD6-binding domain
  • one transmembrane helix
  • six predicted transmembrane domains
  • intracellular N- and C-terminus regions
  • two proline rich region
  • a consensus motif of lipases in first half of the protein
  • a bipartite nuclear localization signal(NLS)
  • six transmembrane-spanning domains with both amino- and carboxyl-terminal tails having a cytosolic orientation and the pore located between transmembrane segments 5 and 6, in C terminal half containing Ser(557), principal phosphorylation site and Ser(559)
  • two PKA (protein kinase A) consensus motifs
  • a 53-AA C-terminal region required for efficient exit from the Golgi
    intraspecies homolog to PKD2
  • transient receptor (TRP) superfamily
  • polycystin subfamily
  • mucolipin subfamily of transient receptor potential (TRP) proteins
  • CATEGORY enzyme , transport channel
    SUBCELLULAR LOCALIZATION     plasma membrane
  • translocated to the plasma membrane during lysosomal exocytosis
  • late endosomal and lysosomal ion channel protein
  • efficient lysosomal targeting requires di-leucine motifs in both the N-terminal and the C-terminal cytosolic tails
  • localized to later compartments along the endocytic pathway (late endosomes and lysosomes
  • basic FUNCTION
  • late endosomal and lysosomal ion channel protein, involved in Ca2+ transport regulating lysosomal exocytosis and trafficking of late endosomes and lysosomes
  • involved in the acidification and in endosomal function
  • playing a major role in Ca(2+) transport regulating lysosomal exocytosis and potentially other phenomena related to the trafficking of late endosomes and lysosomes
  • functions as a Fe2+ permeable channel in late endosomes and lysosomes
  • correct localization of mucolipin-1 and the integrity of its ion pore are essential for its physiological function in the late endocytic pathway
  • with MCOLN2, dictate the localization of MCOLN3 and not vice versa
  • lysosomal membrane protein believed to play a role in endosomal-lysosomal interaction, lysosomal pH stability, lysosome maturation, lipid metabolism, and autophagy
  • activation of MCOLN1 in late endosome and lysosome may lead to the appearance of MCOLN1 proteins at the plasma membrane
  • has been suggested to regulate fusion/fission of vesicles in the endocytic pathway and/or some aspect of lysosomal ion homeostasis such as pH, iron, or zinc content
  • ion channel that regulates membrane transport along the endolysosomal pathway
  • releasing luminal Ca2+ mediated by MCOLN1 and promoting interaction with PDCD6 along with the PDCD6-dependent recruitment of other proteins implicated in fusion/fission events
  • involved in membrane remodeling and the formation of extensions suggests that it may play a role in the formation of cellular processes linked to the late endosome/lysosome (LE/L) pathway
  • mechanistic link between acute TRPML1 loss and cell death
  • potential role in zinc transport
  • lysosomal ion channel permeable to cations, including Fe2+
  • redistributes potentially Fe2+ between the lysosomes and the cytoplasm
  • its role in the cell extends outside lysosomes
    PHYSIOLOGICAL PROCESS exocytosis transport , electron transport
    text cellular trafficking, autophagy, lysosomal biogenesis, lysosomal iron release and lysospmal exocytosis
    a component
    small molecule metal binding,
  • selectivity for ions Na+, K+, Ca2+, Mn2+, Fe2+, Mg2+, Zn2+
  • protein
  • interacting with MCOLN2, MCOLN3, HSC70, HSP40, ALG-2
  • MCOLN1 and TPCN1 are present in the same complex, they function as two independent organellar ion channels and TPCN1, but not MCOLN1 are the targets for NAADP
  • its loss specifically causes, an increase in the lysosomal protease CTSB and the lysosomal membrane protein LAMP1
  • co-expression of MCOLN1 with kinase-inactive protein kinase D (PRKD1 or PRKD2) inhibited MCOLN1 Golgi exit and transport to lysosomes and decreased MCOLN1 cleavage
  • MCOLN1 channel-mediated lysosomal Ca(2+) bursts upon FASLG stimulation promote lysosome trafficking and interactions with the sarcoplasmic reticulum, leading to apoptosis of coronary arterial myocytes via a Ca(2+)-dependent mechanism
  • works potentially in concert with SLC30A4 to regulate zinc translocation between the cytoplasm and lysosomes
  • MCOLN1 positively regulates TLR7 responses in dendritic cells by facilitating RNA transportation to lysosomes
  • lysosomal Ca2+ release through MCOLN1 activates PPP3CA, which binds and dephosphorylates &
  • 8203;TFEB, thus promoting its nuclear translocation
    cell & other
    activated by extracellular or luminal low pH
    inhibited by Gd3+, La3+, verapamil
    Other regulated by phosphorylation
    regulated by PDCD6 (modulates the function of MCOLN1 along the late endosomal-lysosomal pathway)
    corresponding disease(s) ML4
    Other morbid association(s)
    TypeGene ModificationChromosome rearrangementProtein expressionProtein Function
    constitutional       loss of function
    results in intracellular chelatable zinc dyshomeostasis
    Variant & Polymorphism
    Candidate gene
    Therapy target
  • TRPML1 K.O mice show inclusion bodies, enlarged vacuoles, psychomotor defect, retinal degeneration, death at age approximately 8 months
  • neonatal enterocytes of mice lacking both mucolipins (Trpml3-/-;Trpml1-/-) vacuolated pathologically within hours of birth and remained so until weaning