Residue 182 influences the second step of protein-tyrosine phosphatase-mediated catalysis
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Residue 182 influences the second step of protein-tyrosine phosphatase-mediated catalysis. / Pedersen, Anja Kallesøe; Guo, Xiao-Ling; Møller, Karin B; Peters, Günther H; Andersen, Henrik S; Kastrup, Jette Sandholm Jensen; Mortensen, Thomas Steen; Iversen, Lars F; Zhang, Zhong-Yin; Møller, Niels Peter H.
I: Biochemical Journal, Bind 378, Nr. Pt 2, 01.03.2004, s. 421-33.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Residue 182 influences the second step of protein-tyrosine phosphatase-mediated catalysis
AU - Pedersen, Anja Kallesøe
AU - Guo, Xiao-Ling
AU - Møller, Karin B
AU - Peters, Günther H
AU - Andersen, Henrik S
AU - Kastrup, Jette Sandholm Jensen
AU - Mortensen, Thomas Steen
AU - Iversen, Lars F
AU - Zhang, Zhong-Yin
AU - Møller, Niels Peter H
PY - 2004/3/1
Y1 - 2004/3/1
N2 - Previous enzyme kinetic and structural studies have revealed a critical role for Asp181 (PTP1B numbering) in PTP (protein-tyrosine phosphatase)-mediated catalysis. In the E-P (phosphoenzyme) formation step, Asp181 functions as a general acid, while in the E-P hydrolysis step it acts as a general base. Most of our understanding of the role of Asp181 is derived from studies with the Yersinia PTP and the mammalian PTP1B, and to some extent also TC (T-cell)-PTP and the related PTPa and PTPe. The neighbouring residue 182 is a phenylalanine in these four mammalian enzymes and a glutamine in Yersinia PTP. Surprisingly, little attention has been paid to the fact that this residue is a histidine in most other mammalian PTPs. Using a reciprocal single-point mutational approach with introduction of His182 in PTP1B and Phe182 in PTPH1, we demonstrate here that His182-PTPs, in comparison with Phe182-PTPs, have significantly decreased kcat values, and to a lesser degree, decreased kcat/Km values. Combined enzyme kinetic, X-ray crystallographic and molecular dynamics studies indicate that the effect of His182 is due to interactions with Asp181 and with Gln262. We conclude that residue 182 can modulate the functionality of both Asp181 and Gln262 and therefore affect the E-P hydrolysis step of PTP-mediated catalysis.
AB - Previous enzyme kinetic and structural studies have revealed a critical role for Asp181 (PTP1B numbering) in PTP (protein-tyrosine phosphatase)-mediated catalysis. In the E-P (phosphoenzyme) formation step, Asp181 functions as a general acid, while in the E-P hydrolysis step it acts as a general base. Most of our understanding of the role of Asp181 is derived from studies with the Yersinia PTP and the mammalian PTP1B, and to some extent also TC (T-cell)-PTP and the related PTPa and PTPe. The neighbouring residue 182 is a phenylalanine in these four mammalian enzymes and a glutamine in Yersinia PTP. Surprisingly, little attention has been paid to the fact that this residue is a histidine in most other mammalian PTPs. Using a reciprocal single-point mutational approach with introduction of His182 in PTP1B and Phe182 in PTPH1, we demonstrate here that His182-PTPs, in comparison with Phe182-PTPs, have significantly decreased kcat values, and to a lesser degree, decreased kcat/Km values. Combined enzyme kinetic, X-ray crystallographic and molecular dynamics studies indicate that the effect of His182 is due to interactions with Asp181 and with Gln262. We conclude that residue 182 can modulate the functionality of both Asp181 and Gln262 and therefore affect the E-P hydrolysis step of PTP-mediated catalysis.
KW - Amino Acid Sequence
KW - Amino Acids
KW - Aspartic Acid
KW - Catalysis
KW - Enzyme Inhibitors
KW - Histidine
KW - Humans
KW - Hydrolysis
KW - Models, Chemical
KW - Models, Molecular
KW - Mutagenesis, Site-Directed
KW - Nitrophenols
KW - Organophosphorus Compounds
KW - Peptides
KW - Phenylalanine
KW - Phosphotyrosine
KW - Protein Tyrosine Phosphatase, Non-Receptor Type 1
KW - Protein Tyrosine Phosphatase, Non-Receptor Type 3
KW - Protein Tyrosine Phosphatases
KW - Sequence Alignment
KW - Vanadates
U2 - 10.1042/BJ20030565
DO - 10.1042/BJ20030565
M3 - Journal article
C2 - 14572311
VL - 378
SP - 421
EP - 433
JO - Biochemical Journal
JF - Biochemical Journal
SN - 0264-6021
IS - Pt 2
ER -
ID: 44729700