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FLASH GENE
Symbol GUCA1A contributors: mct/npt - updated : 26-11-2020
HGNC name guanylate cyclase activator 1A (retina)
HGNC id 4678
RNA
TRANSCRIPTS type messenger
identificationnb exonstypebpproduct
ProteinkDaAAspecific expressionYearPubmed
6 - 1918 - 201 - 2019 31728034
EXPRESSION
Type restricted
   expressed in (based on citations)
organ(s)
SystemOrgan level 1Organ level 2Organ level 3Organ level 4LevelPubmedSpeciesStageRna symbol
Reproductivemale systemtestis   
Visualeyeretina  highly
cells
SystemCellPubmedSpeciesStageRna symbol
Nervousneuron
Olfactoryolfactory receptor Homo sapiens
Visualcone photoreceptor
cell lineage
cell lines
fluid/secretion
at STAGE
PROTEIN
PHYSICAL PROPERTIES
STRUCTURE
motifs/domains
  • three Ca++ binding motifs,
  • four EF-hand binding the Ca++ (EF-hand 2 is crucial for attachment to RETGC1, but EF-hand 3 is less critical, although it enhances the efficiency of the GUCA1A docking on the target enzyme, metal binding in EF-hand 4 has no role in the primary attachment to the cyclase, and it only triggers the activator-to-inhibitor functional switch in GUCA1A) (Peshenko 2008)
  • HOMOLOGY
    interspecies homolog to murine Guca1a
    Homologene
    FAMILY
    CATEGORY signaling neurotransmitter
    SUBCELLULAR LOCALIZATION     plasma membrane
        intracellular
    intracellular,cytoplasm,cytoskeleton,microtubule
    intracellular,nucleus
    text
  • cone outer and inner segments, in disk membrane regions, and to a lesser extent rod inner and outer segments
  • presence in the scattered population of the olfactory sensory neurons, predominantly present in the cilia, the site of odorant
  • yet, in a smaller quantity, is present also in other regions of the olfactory neuron transduction
  • with PDE2A are coexpressed in the same population of the olfactory sensory neurons
  • basic FUNCTION
  • EF-hand Ca(2+)-binding protein, regulating photoreceptor membrane guanylyl cyclase GUCY2D in a Ca2+ sensitive manner, activating photoreceptor guanylyl cyclase (GUCY2D) in the absence of Ca(2+) and inhibiting GUCY2D in a Ca(2+)-sensitive manner
  • involved in the Ca2+-dependent negative feedback regulation of membrane bound guanylate cyclases in the retina (Kitiratschky 2009)
  • is a natural Ca2+ sensor component of GUCY2D
  • physiological Ca2+ sensor of the odorant-linked GUCY2D transduction system
  • GUCA1A and GUCA1B (or guanylyl cyclase-activating proteins [GCAPs]) have been identified as important mediators of the photoreceptor response to changes in intracellular Ca2+
  • is a neuronal calcium sensor protein that regulates the phototransduction cascade in vertebrates by switching between activator and inhibitor of the target guanylate cyclase (GC) in a Ca2+-dependent manner
  • GUCY2D and GUCA1A are critical for a precisely controlled synthesis of the second messenger cGMP
  • CELLULAR PROCESS
    PHYSIOLOGICAL PROCESS
    PATHWAY
    metabolism
    signaling sensory transduction/vision
    a component
  • constitutive part of the odorant-linked GUCY2D transduction machinery
  • INTERACTION
    DNA
    RNA
    small molecule metal binding,
  • Ca2+/Mg2+ sensors
  • Mg(2+) binding critical for setting the actual dynamic range of GUCY2D regulation by GUCA1A at physiological levels of free Ca(2+)
  • is responsive to Mg²&
  • 8314; only in its low [Ca²&
    8314;] state and Mg²&
    8314;
    protein
  • after substitution of Ca(2+) by Mg(2+) in its EF-hands, stimulates photoreceptor guanylyl cyclase, RetGC1, in response to light (Peshenko 2008)
  • binds to the fragment of AAs 836&
  • 8722;1103 of GUCY2D
  • both GUCA1A and GUCA1B stimulate GUCY2F equally well at saturation (
  • GUCA1A is the 'first-response' sensor protein that stimulates GUCY2D early in the response and thus limits the SPR amplitude
  • cell & other
    REGULATION
    activated by TH (Liu 2007)
    ASSOCIATED DISORDERS
    corresponding disease(s) CORD14
    related resource Retinal Information Network
    Susceptibility to retinitis pigmentosa
    Variant & Polymorphism
    Candidate gene
    Marker
    Therapy target
    ANIMAL & CELL MODELS