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Protein-protein interactions are essential for many activities of any living cell. These interactions involve multi-protein complexes that take part in central processes such as [[DNA replication]], [[transcription]] or [[translation]]. Protein-protein interactions may also be involved in a variety of regulatory events. Metabolic enzymes do often form transien complexes that represent a complete pathways. These complexes are called metabolon. Finally, many interactions may be of a transient nature.
Protein-protein interactions are essential for many activities of any living cell. These interactions involve multi-protein complexes that take part in central processes such as [[DNA replication]], [[transcription]] or [[translation]]. Protein-protein interactions may also be involved in a variety of regulatory events. Metabolic enzymes do often form transien complexes that represent a complete pathways. These complexes are called metabolon. Finally, many interactions may be of a transient nature.


==Methods to detect protein-protein interactions==
=Methods to detect protein-protein interactions=
* Bacterial Two Hybrid System: [[BACTH]] {{PubMed|9576956}}
* Bacterial Two Hybrid System: [[BACTH]] {{PubMed|9576956}}


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'''Attention:''' Each technique detects only about 33% of all interactions {{PubMed|20805792,19060903}}
'''Attention:''' Each technique detects only about 33% of all interactions {{PubMed|20805792,19060903}}


==Visualization of protein-protein interactions in ''B. subtilis''==
=Visualization of protein-protein interactions in ''B. subtilis''=
* [http://cellpublisher.gobics.de/subtinteract/startpage/start/ interactive protein-protein interaction map]  
* [http://cellpublisher.gobics.de/subtinteract/startpage/start/ interactive protein-protein interaction map]  
* the beta version of [http://subtiwiki.uni-goettingen.de/pathways/SubtInteract/demo_mitlinks/ SubtInteract]
* the beta version of [http://subtiwiki.uni-goettingen.de/pathways/SubtInteract/demo_mitlinks/ SubtInteract]


==Protein complexes in ''B. subtilis''==
=Protein complexes in ''B. subtilis''=
==Complexes in [[Cellular processes]]==
=== [[cell wall synthesis]] and [[cell shape]]: the [[cell wall biosynthhetic complex]]===
=== [[cell division]]: the [[divisome]]===
 
==Complexes in [[Metabolism]]==
=== the metabolons of glycolysis and the TCA cycle {{PubMed|19193632,20933603}}===
 
==Complexes in [[Information processing]]==
=== [[DNA replication]]: the [[replisome]]===
=== [[DNA replication]]: the [[replisome]]===
=== [[transcription]]: [[RNA polymerase]]===
=== [[transcription]]: [[RNA polymerase]]===
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=== synthesis of glutamyl-tRNA(Gln): the [[transamidosome]] ([[GatA]]-[[GatB]]-[[GatC]])-[[GltX]]-[[trnS-Gln]]===
=== synthesis of glutamyl-tRNA(Gln): the [[transamidosome]] ([[GatA]]-[[GatB]]-[[GatC]])-[[GltX]]-[[trnS-Gln]]===
=== [[RNases|RNA processing and degradation]]: the [[RNA degradosome]]===
=== [[RNases|RNA processing and degradation]]: the [[RNA degradosome]]===
==Complexes involved in [[Lifestyles]]==
=== [[General stress proteins (controlled by SigB)|general stress response]]: the [[stressosome]]===
=== [[General stress proteins (controlled by SigB)|general stress response]]: the [[stressosome]]===
=== [[cell division]]: the [[divisome]]===
=== DNA uptake: the [[pseudopilus]] {{PubMed|21278288,16751195}}===
=== DNA uptake: the [[pseudopilus]] {{PubMed|21278288,16751195}}===
=== [[metabolism]]: the metabolons of glycolysis and the TCA cycle {{PubMed|19193632,20933603}}===
===spore [[germination]]: the [[germinosome]]===
===spore [[germination]]: the [[germinosome]]===



Revision as of 18:40, 10 July 2011

Protein-protein interactions are essential for many activities of any living cell. These interactions involve multi-protein complexes that take part in central processes such as DNA replication, transcription or translation. Protein-protein interactions may also be involved in a variety of regulatory events. Metabolic enzymes do often form transien complexes that represent a complete pathways. These complexes are called metabolon. Finally, many interactions may be of a transient nature.

Methods to detect protein-protein interactions

  • Yeast Two Hybrid System PubMed
  • SPINE: A method to detect in vivo protein-protein interactions after cross-linking PubMed
  • in vivo detection of protein-protein interaction using DivIVA and GFP PubMed

Attention: Each technique detects only about 33% of all interactions PubMed

Visualization of protein-protein interactions in B. subtilis

Protein complexes in B. subtilis

Complexes in Cellular processes

cell wall synthesis and cell shape: the cell wall biosynthhetic complex

cell division: the divisome

Complexes in Metabolism

the metabolons of glycolysis and the TCA cycle PubMed

Complexes in Information processing

DNA replication: the replisome

transcription: RNA polymerase

translation: the ribosome

synthesis of glutamyl-tRNA(Gln): the transamidosome (GatA-GatB-GatC)-GltX-trnS-Gln

RNA processing and degradation: the RNA degradosome

Complexes involved in Lifestyles

general stress response: the stressosome

DNA uptake: the pseudopilus PubMed

spore germination: the germinosome

Suspected hub proteins potentially involved in a large number of interactions (as deduced from a Yeast two-hybrid analysis)

<pubmed> 21630458</pubmed>

Important publications

<pubmed>20658969 18228443 18219467 17953394 15264234 14706816 12127457 11827824 11377797 11306254 10851163 10842303 18366733 10694888 2200717 2441660 20969605 15451506 </pubmed>