STRINGSTRING
PBI2 protein (Saccharomyces cerevisiae) - STRING interaction network
"PBI2" - Cytosolic inhibitor of vacuolar proteinase B in Saccharomyces cerevisiae
Nodes:
Network nodes represent proteins
splice isoforms or post-translational modifications are collapsed, i.e. each node represents all the proteins produced by a single, protein-coding gene locus.
Node Color
colored nodes:
query proteins and first shell of interactors
white nodes:
second shell of interactors
Node Content
empty nodes:
proteins of unknown 3D structure
filled nodes:
some 3D structure is known or predicted
Edges:
Edges represent protein-protein associations
associations are meant to be specific and meaningful, i.e. proteins jointly contribute to a shared function; this does not necessarily mean they are physically binding each other.
Known Interactions
from curated databases
experimentally determined
Predicted Interactions
gene neighborhood
gene fusions
gene co-occurrence
Others
textmining
co-expression
protein homology
Your Input:
Neighborhood
Gene Fusion
Cooccurence
Coexpression
Experiments
Databases
Textmining
[Homology]
Score
PBI2Cytosolic inhibitor of vacuolar proteinase B (PRB1), required for efficient vacuole inheritance; with thioredoxin forms protein complex LMA1, which assists in priming SNARE molecules and promotes vacuole fusion; Cytosolic inhibitor of vacuolar proteinase B (yscB), probably regulating protease B activity during limited proteolysis. PBI2 is a component of the LMA1 complex, which is involved in the facilitation of vesicle fusion such as homotypic vacuole and ER-derived COPII vesicle fusion with the Golgi (75 aa)    
Predicted Functional Partners:
PRB1
Vacuolar proteinase B (yscB), a serine protease of the subtilisin family; involved in protein degradation in the vacuole and required for full protein degradation during sporulation; activity inhibited by Pbi2p; Vacuolar proteinase B involved in protein degradation in the vacuole. Among other substrates, acts on carboxypeptidase Y (cpY/PRC1) to activate it by processing its Pro-peptide. Required for meiosis and spore formation, and for optimal survival in stationary phase (635 aa)
     
 
  0.917
SEC18
ATPase required for vesicular transport between ER and Golgi, the ’priming’ step in homotypic vacuole fusion, autophagy, and protein secretion; releases Sec17p from SNAP complexes; has similarity to mammalian NSF; Required for vesicle-mediated transport. Catalyzes the fusion of transport vesicles within the Golgi cisternae. Is also required for transport from the endoplasmic reticulum to the Golgi stack. Seems to function as a fusion protein required for the delivery of cargo proteins to all compartments of the Golgi stack independent of vesicle origin (758 aa)
       
 
  0.897
STF2
Protein involved in regulation of the mitochondrial F1F0-ATP synthase; Stf1p and Stf2p may act as stabilizing factors that enhance inhibitory action of the Inh1p protein; This is one of two stabilizing factors of the inactive mitochondrial F0F1-ATPase. It binds to the F0 part and facilitates the binding of both the inhibitor and the 9 kDa protein to F1 (84 aa)
     
   
  0.867
YHR138C
Putative protein of unknown function; has similarity to Pbi2p; double null mutant lacking Pbi2p and Yhr138p exhibits highly fragmented vacuoles (114 aa)
     
 
  0.866
SEC17
Peripheral membrane protein required for vesicular transport between ER and Golgi, the ’priming’ step in homotypic vacuole fusion, and autophagy; stimulates the ATPase activity of Sec18p; has similarity to mammalian alpha-SNAP; SNARE complex protein that binds to cis-SNARE complexes on membranes and is required for vesicular transport between the endoplasmic reticulum and the Golgi apparatus and for homotypic vacuole fusion. During the priming step of membrane fusion, is released from cis-SNARE complexes by SEC18 to establish a pool of unpaired SNAREs, which are required for interactio [...] (292 aa)
           
  0.849
STF1
Protein involved in regulation of the mitochondrial F1F0-ATP synthase; Stf1p and Stf2p may act as stabilizing factors that enhance inhibitory action of the Inh1p protein; This is 1 of 2 proteins that can stabilize the ATPase- inhibitor complex, which normally dissociates when externally added ATP has been consumed (86 aa)
     
        0.817
NYV1
v-SNARE component of the vacuolar SNARE complex involved in vesicle fusion; inhibits ATP-dependent Ca(2+) transport activity of Pmc1p in the vacuolar membrane; Vacuolar v-SNARE required for docking. Only involved in homotypic vacuole fusion. Required for Ca(2+) efflux from the vacuolar lumen, a required signal for subsequent membrane fusion events, by inhibiting vacuolar Ca(2+)-ATPase PMC1 and promoting Ca(2+) release when forming trans-SNARE assemblies during the docking step (253 aa)
           
  0.750
YPT7
Rab family GTPase; GTP-binding protein of the rab family; required for homotypic fusion event in vacuole inheritance, for endosome-endosome fusion, similar to mammalian Rab7; Needed for homotypic vacuole fusion, the last step in the vacuole inheritance process (208 aa)
           
  0.748
GDI1
GDP dissociation inhibitor, regulates vesicle traffic in secretory pathways by regulating the dissociation of GDP from the Sec4/Ypt/rab family of GTP binding proteins; Regulates the GDP/GTP exchange reaction of SEC4 by inhibiting the dissociation of GDP from it, and the subsequent binding of GTP to SEC4. Plays an essential role in the yeast secretory pathway (451 aa)
           
  0.744
VAM3
Syntaxin-like vacuolar t-SNARE; functions with Vam7p in vacuolar protein trafficking; mediates docking/fusion of late transport intermediates with the vacuole; has an acidic di-leucine sorting signal and C-terminal transmembrane region; Required for vacuolar assembly. Provides the t-SNARE function in a late step of the vacuolar assembly. Required for homotypic vacuole membrane fusion, autophagy and fusion of biosynthetic transport vesicles with the vacuole. Required for the delivery of alpha-factor receptor-ligand complexes to the vacuole (283 aa)
           
  0.739
Your Current Organism:
Saccharomyces cerevisiae
NCBI taxonomy Id: 4932
Other names: Candida robusta, Pachytichospora, S. cerevisiae, Saccharomyces, Saccharomyces capensis, Saccharomyces cerevisiae, Saccharomyces italicus, Saccharomyces oviformis, Saccharomyces uvarum var. melibiosus, lager beer yeast, yeast
Server load: very high (>100%) [HD]