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Thymidine kinase 1 regulatory fine-tuning through tetramer formation.
MedLine Citation:
PMID:  23351158     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Thymidine kinase 1 (TK1) provides a crucial precursor, thymidine monophosphate (dTMP), for nucleic acid synthesis, and the activity of TK1 increases up to 200-fold during the S-phase of cell division in humans. An important part of the regulatory check-points is the ATP and enzyme concentration-dependent transition of TK1 from a dimer with low catalytic efficiency to a tetramer with high catalytic efficiency. This regulatory fine-tuning serves as an additional control to provide the balanced pool of nucleic acid precursors in the cell. We sub-cloned and over-expressed ten different TK1s, originating from widely different organisms, and characterized their kinetic and oligomerization properties. While bacteria, plants and Dictyostelium only exhibited dimeric TK1, we found that all animals had a tetrameric TK1. However, a clear ATP dependent switch between dimer and tetramer was found only in higher vertebrates, and was especially pronounced in mammalian and bird TK1s. We suggest that the dimer form is the original one and the tetramer originated in the animal lineage after the split of Dictyostelium and the lineages leading to invertebrates and vertebrates. The efficient switching mechanism was likely settled first in the warm-blooded animals when they separated from the rest of vertebrates. © 2013 The Authors Journal compilation © 2013 FEBS.
Authors:
Zeeshan Mutahir; Anders Ranegaard Clausen; Karl-Magnus Andersson; Sofia Mebrahtu Wisen; Birgitte Munch-Petersen; Jure Piškur
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-28
Journal Detail:
Title:  The FEBS journal     Volume:  -     ISSN:  1742-4658     ISO Abbreviation:  FEBS J.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101229646     Medline TA:  FEBS J     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2013 The Authors Journal compilation © 2013 FEBS.
Affiliation:
Department of Biology, Lund University, Lund, Sweden.
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