CATION PROMOTED ASSOCIATION (CPA) OF A REGULATORY AND TARGET PROTEIN IS CONTROLLED BY PHOSPHORYLATION

Cation-promoted association of a regulatory and target protein is controlled by protein phosphorylation.

Three-Dimensional Structure of the Regulatory Complex of Escherichia Coli III-Glc with Glycerol Kinase

GLFDKLKSLVSDDKKDTGTIEIIAPLSGEIVNIEDVPDVVFAEKIVGDGIAIKPTGNKMVAPVDGTIGKIFETNHAFSIE
SDSGVELFVHFGIDTVELKGEGFKRIAEEGQRVKVGDTVIEFDLPLLEEKAKSTLTPVVISNMDEIKELIKLSGSVTVGE
TPVIRIKK

TEKKYIVALDQGTTSSRAVVMDHDANIISVSQREFEQIYPKPGWVEHDPMEIWATQSSTLVEVLAKADISSDQIAAIGIT
NQRETTIVWEKETGKPIYNAIVWQCRRTAEICEHLKRDGLEDYIRSNTGLVIDPYFSGTKVKWILDHVEGSRERARRGEL
LFGTVDTWLIWKMTQGRVHVTDYTNASRTMLFNIHTLDWDDKMLEVLDIPREMLPEVRRSSEVYGQTNIGGKGGTRIPIS
GIAGDQQAALFGQLCVKEGMAKNTYGTGCFMLMNTGEKAVKSENGLLTTIACGPTGEVNYALEGAVFMAGASIQWLRDEM
KLINDAYDSEYFATKVQNTNGVYVVPAFTGLGAPYWDPYARGAIFGLTRGVNANHIIRATLESIAYQTRDVLEAMQADSG
IRLHALRVDGGAVANNFLMQFQSDILGTRVERPEVREVTALGAAYLAGLAVGFWQNLDELQEKAVIEREFRPGIETTERN
YRYAGWKKAVKRAMAWEEHDE

THE COMPLEX OF GLYCEROL KINASE AND III-GLC CREATES AN INTERMOLECULAR ZINC BINDING SITE. HISTIDINES 75 AND 90 OF III-GLC AND GLUTAMATE 478 OF GLYCEROL KINASE ARE THE LIGANDS THAT CONTACT THE ZN(II) ION. A SOLVENT MOLECULE (PROBABLY A HYDROXIDE) IS BOUND TO THE ZN(II) AND ACCEPTS HYDROGEN BONDS FROM THE BACKBONE AMIDES OF III-GLC RESIDUES 95 AND 96. THERE ARE NO LARGE CONFORMATIONAL CHANGES EXCEPT FOR THE SIDE CHAIN OF GLYCEROL KINASE RESIDUE GLUTAMATED 478, WHICH ADOPTS A VERY DIFFERENT CONFORMATION FROM THAT SEEN IN OTHER STRUCTURES OF THE COMPLEX.

THE CRYSTAL CONTAINS TETRAMERS OF THE GLYCEROL
KINASE/III-GLC COMPLEX WITH 222 POINT-GROUP SYMMETRY. THE
TETRAMER IS LOCATED AT THE INTERSECTION OF THREE
CRYSTALLOGRAPHIC TWO-FOLD AXES. THE FOLLOWING
TRANSFORMATIONS WILL PRODUCE A TETRAMER OF THE COMPLEX WHEN
APPLIED TO THE COORDINATES IN THIS ENTRY:

TRANSFORM 1 (-X, 1-Y, Z)
-1.0 0.0 0.0 0.0
0.0 -1.0 0.0 125.16
0.0 0.0 1.0 0.0

TRANSFORM 2 ( X, 1-Y, -Z)
1.0 0.0 0.0 0.0
0.0 -1.0 0.0 125.16
0.0 0.0 1.0 0.0

TRANSFORM 3 (-X, Y, -Z)
-1.0 0.0 0.0 0.0
0.0 1.0 0.0 0.0
0.0 0.0 -1.0 0.0

MG(II) BINDING SITE AT THE ACTIVE SITE OF GLYCEROL KINASE