title: A synthetic peptide reproducing the mitochondrial targeting motif of AKAP121: a conformational study.
abstract: The conformational features of a peptide derived by the 10-30 sequence of the mitochondrial domain of AKAP121 [Ac-1XKKPLALPGMLALLGWWWFFSRKKX25-NH2 (X=beta-Ala)] in water and in a water/trifluoroethanol (TFE) mixture at 298 K have been determined by NMR and CD spectroscopy. Backbone clustering analysis of NMR-derived structures led to the identification of a single representative structure in water/TFE. The structure of the peptide consists mainly of an alpha-helix, whose core is the region 7-23, with a less ordered N-terminal part. These data are confirmed by CD analysis. It is noteworthy that the high hydrophobic Trp16-Phe20 segment, that might also mediate interaction with tubulin, is organized in an alpha-helical wheel. Our conformational data can be the starting point for the development of highly selective peptides that interfere with the biological function of the Protein Kinase A scaffold protein AKAP121.
authors.affiliation: Dipartimento di Scienze, Ambientali, Seconda Università di Napoli, Caserta, 81100, Italy.
authors.forename: Antonia
authors.initials: A
authors.lastname: De Capua
authors.forename: Annarita
authors.initials: A
authors.lastname: Del Gatto
authors.forename: Laura
authors.initials: L
authors.lastname: Zaccaro
authors.forename: Gabriella
authors.initials: G
authors.lastname: Saviano
authors.forename: Annalisa
authors.initials: A
authors.lastname: Carlucci
authors.forename: Alessandra
authors.initials: A
authors.lastname: Livigni
authors.forename: Chiara
authors.initials: C
authors.lastname: Gedressi
authors.forename: Teodorico
authors.initials: T
authors.lastname: Tancredi
authors.forename: Carlo
authors.initials: C
authors.lastname: Pedone
authors.forename: Michele
authors.initials: M
authors.lastname: Saviano
mesh_terms: D054758:A Kinase Anchor Proteins; D048868:Adaptor Proteins, Signal Transducing / Q000737:chemistry* / Q000378:metabolism; D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D000818:Animals; D002942:Circular Dichroism; D006801:Humans; D008928:Mitochondria / Q000378:metabolism; D008958:Models, Molecular; D008969:Molecular Sequence Data; D019906:Nuclear Magnetic Resonance, Biomolecular; D010455:Peptides / Q000138:chemical synthesis / Q000737:chemistry* / Q000378:metabolism; D011487:Protein Conformation
chemical_list: D054758:A Kinase Anchor Proteins; C105137:AKAP1 protein, human; D048868:Adaptor Proteins, Signal Transducing; D010455:Peptides