title: Interaction mode of n-dodecylphosphorylcholine, a substrate analogue, with bovine pancreas phospholipase A2 as determined by X-ray crystal analysis.
abstract: Three-dimensional structure of a bovine pancreas phospholipase A2 (PLA2) crystal complexed with n-dodecylphosphorylcholine (n-C12PC), a substrate-type inhibitor, has been determined by the X-ray diffraction method. The present conventional R value is 0.275 at 2.3A resolution. The binding mode of n-C12PC to the PLA2 was clearly indicated, where the dodecyl chain was stably held by the hydrophobic contacts with the N-terminal region of PLA2 (Leu-2, Phe-5, and Ile-9), and the choline moiety was contacted with the hydrophobic space created by the side chains of Lys-53 and 56. The present result indicates that remarkable changes from the native PLA2 structure are caused at the N-terminal and middle (residues 60 to 70) regions by the binding of n-C12PC to the enzyme.
authors.affiliation: Department of Physical Chemistry, Osaka University of Pharmaceutical Sciences, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Tomoo
authors.forename: H
authors.initials: H
authors.lastname: Ohishi
authors.forename: M
authors.initials: M
authors.lastname: Doi
authors.forename: T
authors.initials: T
authors.lastname: Ishida
authors.forename: M
authors.initials: M
authors.lastname: Inoue
authors.forename: K
authors.initials: K
authors.lastname: Ikeda
authors.forename: H
authors.initials: H
authors.lastname: Mizuno
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002417:Cattle; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003460:Crystallization; D008969:Molecular Sequence Data; D015394:Molecular Structure; D010179:Pancreas / Q000201:enzymology*; D010741:Phospholipases A / Q000737:chemistry / Q000378:metabolism*; D054467:Phospholipases A2; D010767:Phosphorylcholine / Q000031:analogs & derivatives* / Q000737:chemistry / Q000378:metabolism; D011485:Protein Binding; D012689:Sequence Homology, Nucleic Acid; D014961:X-Ray Diffraction
chemical_list: D010767:Phosphorylcholine; C028810:dodecylphosphocholine; D010741:Phospholipases A; D054467:Phospholipases A2