The NHR1-1 of Prs1 and the pentameric motif 284KKCPK288 of Prs3 permit multi-functionality of the PRPP synthetase in Saccharomyces cerevisiae.
Journal
FEMS yeast research
ISSN: 1567-1364
Titre abrégé: FEMS Yeast Res
Pays: England
ID NLM: 101085384
Informations de publication
Date de publication:
01 03 2019
01 03 2019
Historique:
received:
17
12
2018
accepted:
10
01
2019
pubmed:
17
1
2019
medline:
28
8
2019
entrez:
17
1
2019
Statut:
ppublish
Résumé
The five-membered PRS gene family of Saccharomyces cerevisiae is an example of gene duplication allowing the acquisition of novel functions. Each of the five Prs polypeptides is theoretically capable of synthesising PRPP but at least one of the following heterodimers is required for survival: Prs1/Prs3, Prs2/Prs5 and Prs4/Prs5. Prs3 contains a pentameric motif 284KKCPK288 found only in nuclear proteins. Deletion of 284KKCPK288 destabilises the Prs1/Prs3 complex resulting in a cascade of events, including reduction in PRPP synthetase activity and altered cell wall integrity (CWI) as measured by caffeine sensitivity and Rlm1 expression. Prs3 also interacts with the kinetochore-associated protein, Nuf2. Following the possibility of 284KKCPK288-mediated transport of the Prs1/Prs3 complex to the nucleus, it may interact with Nuf2 and phosphorylated Slt2 permitting activation of Rlm1. This scenario explains the breakdown of CWI encountered in mutants lacking PRS3 or deleted for 284KKCPK288. However, removal of NHR1-1 from Prs1 does not disrupt the Prs1/Prs3 interaction as shown by increased PRPP synthetase activity. This is evidence for the separation of the two metabolic functions of the PRPP-synthesising machinery: provision of PRPP and maintenance of CWI and is an example of evolutionary development when multiple copies of a gene were present in the ancestral organism.
Identifiants
pubmed: 30649305
pii: 5288342
doi: 10.1093/femsyr/foz006
pmc: PMC6368438
doi:
Substances chimiques
Protein Subunits
0
Saccharomyces cerevisiae Proteins
0
Phosphoribosyl Pyrophosphate
7540-64-9
PRS1 protein, S cerevisiae
EC 2.7.6.1
PRS3 protein, S cerevisiae
EC 2.7.6.1
Ribose-Phosphate Pyrophosphokinase
EC 2.7.6.1
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : Wellcome Trust
Pays : United Kingdom
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