TY  - JOUR
AU  - Kutter, S.
AU  - Weiss, M. S.
AU  - Wille, G.
AU  - Golbik, R.
AU  - Spinka, M.
AU  - König, S.
AU  - DESY
TI  - Covalently Bound Substrate at the Regulatory Site of Yeast Pyruvate Decarboxylases Triggers Allosteric Enzyme Activation
JO  - The journal of biological chemistry
VL  - 284
SN  - 0021-9258
CY  - Bethesda, Md.
PB  - Soc.
M1  - PHPPUBDB-12657
SP  - 12136-12144
PY  - 2009
AB  - The mechanism by which the enzyme pyruvate decarboxylase from two yeast species is activated allosterically has been elucidated. A total of seven three-dimensional structures of the enzyme, of enzyme variants, or of enzyme complexes from two yeast species, three of them reported here for the first time, provide detailed atomic resolution snapshots along the activation coordinate. The prime event is the covalent binding of the substrate pyruvate to the side chain of cysteine 221, thus forming a thiohemiketal. This reaction causes the shift of a neighboring amino acid, which eventually leads to the rigidification of two otherwise flexible loops, one of which provides two histidine residues necessary to complete the enzymatically competent active site architecture. The structural data are complemented and supported by kinetic investigations and binding studies, providing a consistent picture of the structural changes occurring upon enzyme activation.
KW  - Allosteric Regulation: physiology
KW  - Enzyme Activation: physiology
KW  - Fungal Proteins: chemistry
KW  - Kinetics
KW  - Kluyveromyces: enzymology
KW  - Protein Structure, Tertiary: physiology
KW  - Pyruvate Decarboxylase: chemistry
KW  - Pyruvic Acid: chemistry
KW  - Fungal Proteins (NLM Chemicals)
KW  - Pyruvic Acid (NLM Chemicals)
KW  - Pyruvate Decarboxylase (NLM Chemicals)
LB  - PUB:(DE-HGF)16
C6  - pmid:19246454
C2  - pmc:PMC2673282
UR  - <Go to ISI:>//WOS:000265494600045
DO  - DOI:10.1074/jbc.M806228200
UR  - https://bib-pubdb1.desy.de/record/94208
ER  -