GOLGB1 | |||||||||||||||||||||||||||||||||||||||||||||||||||
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Identifiers | |||||||||||||||||||||||||||||||||||||||||||||||||||
Aliases | GOLGB1 , GCP, GCP372, GOLIM1, golgin B1 | ||||||||||||||||||||||||||||||||||||||||||||||||||
External IDs | OMIM: 602500; MGI: 1099447; HomoloGene: 68401; GeneCards: GOLGB1; OMA:GOLGB1 - orthologs | ||||||||||||||||||||||||||||||||||||||||||||||||||
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Wikidata | |||||||||||||||||||||||||||||||||||||||||||||||||||
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Giantin or Golgin subfamily B member 1 is a protein that in humans is encoded by the GOLGB1 gene. [5] [6] [7] Giantin is located at the cis-medial rims of the Golgi apparatus and is part of the Golgi matrix that is responsible for membrane trafficking in secretory pathway of proteins. This function is key for proper localisation of proteins at the plasma membrane and outside the cell (extracellular region) which is important for cell function that is dependent on for example receptors and the extracellular matrix function. Recent animal model knockout studies of GOLGB1 in mice, [8] rat, [9] and zebrafish [10] have shown that phenotypes are different between species ranging from mild to severe craniofacial defects in the rodent models to just minor size defects in zebrafish. However, in adult zebrafish a tumoral calcinosis-like phenotype was observed, and in humans such phenotype has been linked to defective glycosyltransferase function (e.g. GALNT3 protein). [11]
Giantin is a disulfide-linked homodimer which contains several (around 37) coiled-coiled domains. GOLGB1 protein has been shown to interact with ACBD3 and with PLK3 [12] and vesicle tethering small GTPases Rab1 and Rab6. [13] Giantin also interacts with P115 at the N-terminal coils facilitating binding to the other Golgi matrix protein GM130 [14] that is thought to be important for Golgi secretory function. Loss-of function studies of giantin have also suggested a role in primary cilia [15] [16] function and defective regulation of glycosyltransferase expression and calcineurin signalling in tissue culture cells. [17] [18]
Coatomer subunit beta is a protein that in humans is encoded by the COPB1 gene.
Golgin subfamily A member 2, also known as 130 kDa cis-Golgi matrix protein 1 (GM130) is a protein that in humans is encoded by the GOLGA2 gene.
Cux1 is a homeodomain protein that in humans is encoded by the CUX1 gene.
General vesicular transport factor p115 is a protein that in humans is encoded by the USO1 gene.
Ras-related protein Rab-1A is a protein that in humans is encoded by the RAB1A gene.
N-ethylmaleimide-sensitive factor Attachment Protein Alpha, also known as SNAP-α, is a SNAP protein that is involved in the intra-cellular trafficking and fusing of vesicles to target membranes in cells.
Golgi reassembly-stacking protein 1 (GORASP1) also known as Golgi reassembly-stacking protein of 65 kDa (GRASP65) is a protein that in humans is encoded by the GORASP1 gene.
Syntaxin-5 is a protein that in humans is encoded by the STX5 gene.
Synaptobrevin homolog YKT6 is a protein that in humans is encoded by the YKT6 gene.
Golgin subfamily A member 3 is a protein that in humans is encoded by the GOLGA3 gene.
Golgin subfamily A member 4 is a protein that in humans is encoded by the GOLGA4 gene.
Vesicle-associated membrane protein 8 is a protein that in humans is encoded by the VAMP8 gene.
Golgi SNAP receptor complex member 1 is a protein that in humans is encoded by the GOSR1 gene.
BET1-like protein is a protein that in humans is encoded by the BET1L gene.
Golgin subfamily A member 5 is a protein that in humans is encoded by the GOLGA5 gene.
Sec1 family domain-containing protein 1 is a protein that in humans is encoded by the SCFD1 gene.
Golgi SNAP receptor complex member 2 is a protein that in humans is encoded by the GOSR2 gene.
Golgi resident protein GCP60 is a protein that in humans is encoded by the ACBD3 gene.
Conserved oligomeric Golgi complex subunit 2 is a protein that in humans is encoded by the COG2 gene.
The Golgi matrix is a collection of proteins involved in the structure and function of the Golgi apparatus. The matrix was first isolated in 1994 as an amorphous collection of 12 proteins that remained associated together in the presence of detergent and 150 mM NaCl. Treatment with a protease enzyme removed the matrix, which confirmed the importance of proteins for the matrix structure. Modern freeze etch electron microscopy (EM) clearly shows a mesh connecting Golgi cisternae and associated vesicles. Further support for the existence of a matrix comes from EM images showing that ribosomes are excluded from regions between and near Golgi cisternae.