scholarly journals The Role of Thiol Groups in the Modification of the Template Activity of Histone-Deoxyribonucleic Acid Complexes

1966 ◽  
Vol 100 (2) ◽  
pp. 21C-23C ◽  
Author(s):  
J. Hilton ◽  
L. A. Stocken
Keyword(s):  
Deoxyribonucleic Acid ◽  
Thiol Groups ◽  
Template Activity

scholarly journals Mechanism of porphobilinogen synthase. Possible role of essential thiol groups.

1977 ◽  
Vol 252 (24) ◽  
pp. 8965-8974 ◽  
Author(s):  
G.F. Barnard ◽  
R. Itoh ◽  
L.H. Hohberger ◽  
D. Shemin
Keyword(s):  
Thiol Groups ◽  
Porphobilinogen Synthase

On the molecular basis of pyruvate kinase deficiency II. Role of thiol groups in pyruvate kinase from pyruvate kinase-deficient patients

1974 ◽  
Vol 334 (2) ◽  
pp. 361-367 ◽  
Author(s):  
Th.J.C. Van Berkel ◽  
G.E.J. Staal ◽  
J.F. Koster ◽  
J.G. Nyessen ◽  
L. van Milligen-Boersma
Keyword(s):  
Pyruvate Kinase ◽  
Molecular Basis ◽  
Thiol Groups ◽  
Pyruvate Kinase Deficiency

scholarly journals LATS1/WARTS phosphorylates MYPT1 to counteract PLK1 and regulate mammalian mitotic progression

2012 ◽  
Vol 197 (5) ◽  
pp. 625-641 ◽  
Author(s):  
Tatsuyuki Chiyoda ◽  
Naoyuki Sugiyama ◽  
Takatsune Shimizu ◽  
Hideaki Naoe ◽  
Yusuke Kobayashi ◽  
...  
Keyword(s):  
Dna Damage ◽  
Deoxyribonucleic Acid ◽  
Mitotic Exit ◽  
Dna Damage Checkpoint ◽  
Mitotic Progression ◽  
Myosin Phosphatase ◽  
G2 Checkpoint ◽  
Mitotic Exit Network ◽  
Kinase Screening

In the mitotic exit network of budding yeast, Dbf2 kinase phosphorylates and regulates Cdc14 phosphatase. In contrast, no phosphatase substrates of LATS1/WARTS kinase, the mammalian equivalent of Dbf2, has been reported. To address this discrepancy, we performed phosphoproteomic screening using LATS1 kinase. Screening identified MYPT1 (myosin phosphatase–targeting subunit 1) as a new substrate for LATS1. LATS1 directly and preferentially phosphorylated serine 445 (S445) of MYPT1. An MYPT1 mutant (S445A) failed to dephosphorylate Thr 210 of PLK1 (pololike kinase 1), thereby activating PLK1. This suggests that LATS1 promotes MYPT1 to antagonize PLK1 activity. Consistent with this, LATS1-depleted HeLa cells or fibroblasts from LATS1 knockout mice showed increased PLK1 activity. We also found deoxyribonucleic acid (DNA) damage–induced LATS1 activation caused PLK1 suppression via the phosphorylation of MYPT1 S445. Furthermore, LATS1 knockdown cells showed reduced G2 checkpoint arrest after DNA damage. These results indicate that LATS1 phosphorylates a phosphatase as does the yeast Dbf2 and demonstrate a novel role of LATS1 in controlling PLK1 at the G2 DNA damage checkpoint.

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