1K8F

CRYSTAL STRUCTURE OF THE HUMAN C-TERMINAL CAP1-ADENYLYL CYCLASE ASSOCIATED PROTEIN

Summary for 1K8F

• Entry DOI: 10.2210/pdb1k8f/pdb
• Related: 1K4Z
• Descriptor: ADENYLYL CYCLASE-ASSOCIATED PROTEIN (1 entity in total)
• Functional Keywords: cap, cap1, adenylyl cyclase associated protein, actin binding, structural genomics, psi, protein structure initiative, new york sgx research center for structural genomics, nysgxrc, unknown function
• Biological source: Homo sapiens (human)
• Total number of polymer chains: 4
• Total formula weight: 69447.65

Authors

Patskovsky, Y.V.,Chance, M.,Almo, S.C.,Burley, S.K.,New York SGX Research Center for Structural Genomics (NYSGXRC) (deposition date: 2001-10-24, release date: 2003-07-01, Last modification date: 2023-08-16)

Primary citation

Dodatko, T.,Fedorov, A.A.,Grynberg, M.,Patskovsky, Y.,Rozwarski, D.A.,Jaroszewski, L.,Aronoff-Spencer, E.,Kondraskina, E.,Irving, T.,Godzik, A.,Almo, S.C.
Crystal structure of the actin binding domain of the cyclase-associated protein.
Biochemistry, 43:10628-10641, 2004

PubMed Abstract: Cyclase-associated protein (CAP or Srv2p) is a modular actin monomer binding protein that directly regulates filament dynamics and has been implicated in a number of complex developmental and morphological processes, including mRNA localization and the establishment of cell polarity. The crystal structure of the C-terminal dimerization and actin monomer binding domain (C-CAP) reveals a highly unusual dimer, composed of monomers possessing six coils of right-handed beta-helix flanked by antiparallel beta-strands. Domain swapping, involving the last two strands of each monomer, results in the formation of an extended dimer with an extensive interface. This structural and biochemical characterization provides new insights into the organization and potential mechanistic properties of the multiprotein assemblies that integrate dynamic actin processes into the overall physiology of the cell. An unanticipated finding is that the unique tertiary structure of the C-CAP monomer provides a structural model for a wide range of molecules, including RP2 and cofactor C, proteins involved in X-linked retinitis pigmentosa and tubulin maturation, respectively, as well as several uncharacterized proteins that exhibit very diverse domain organizations. Thus, the unusual right-handed beta-helical fold present in C-CAP appears to support a wide range of biological functions.

PubMed: 15311924
DOI: 10.1021/bi049071r

Experimental method

X-RAY DIFFRACTION (2.8 Å)