1PK8

Crystal Structure of Rat Synapsin I C Domain Complexed to Ca.ATP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.222 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Tetramerization and ATP binding by a protein comprising the A, B, and C domains of rat synapsin I.

Brautigam, C.A.Chelliah, Y.Deisenhofer, J.

(2004) J Biol Chem 279: 11948-11956

  • DOI: 10.1074/jbc.M312015200
  • Primary Citation of Related Structures:  
    1PX2, 1PK8

  • PubMed Abstract: 
  • Synapsins are multidomain proteins that are critical for regulating neurotransmitter release in vertebrates. In the present study, two crystal structures of the C domain of rat synapsin I (rSynI-C) in complex with Ca(2+) and ATP reveal that this protein can form a tetramer and that a flexible loop (the "multifunctional loop") contacts bound ATP ...

    Synapsins are multidomain proteins that are critical for regulating neurotransmitter release in vertebrates. In the present study, two crystal structures of the C domain of rat synapsin I (rSynI-C) in complex with Ca(2+) and ATP reveal that this protein can form a tetramer and that a flexible loop (the "multifunctional loop") contacts bound ATP. Further experiments were carried out on a protein comprising the A, B, and C domains of rat synapsin I (rSynI-ABC). An ATP-stabilized tetramer of rSynI-ABC is observed during velocity sedimentation and size-exclusion chromatographic experiments. These hydrodynamic results also indicate that the A and B domains exist in an extended conformation. Calorimetric measurements of ATP binding to wild-type and mutant rSynI-ABC demonstrate that the multifunctional loop and a cross-tetramer contact are important for ATP binding. The evidence supports a view of synapsin I as an ATP-utilizing, tetrameric protein made up of monomers that have a flexible, extended N terminus.


    Related Citations: 
    • Synapsin I is structurally similar to ATP-utilizing enzymes
      Esser, L., Wang, C.R., Hosaka, M., Smagula, C.S., Sudhof, T.C., Deisenhofer, J.
      (1998) EMBO J 17: 977

    Organizational Affiliation

    Howard Hughes Medical Institute and the Department of Biochemistry, The University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75390-9050, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
rat synapsin IA, B, C, D, E, F, G, H422Rattus norvegicusMutation(s): 0 
Gene Names: Syn1
UniProt
Find proteins for P09951 (Rattus norvegicus)
Explore P09951 
Go to UniProtKB:  P09951
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP

Download Ideal Coordinates CCD File 
J [auth A], M [auth B], P [auth C], R [auth D], T [auth E], V [auth F], X [auth G], Z [auth H]ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
 Ligand Interaction
EDO
Query on EDO

Download Ideal Coordinates CCD File 
K [auth A], N [auth B]1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

Download Ideal Coordinates CCD File 
I [auth A], L [auth B], O [auth C], Q [auth D], S [auth E], U [auth F], W [auth G], Y [auth H]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
ATPKd:  120   nM  Binding MOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.222 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.6α = 80.6
b = 78.4β = 76.9
c = 135γ = 71.8
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
EPMRphasing
CNSrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-03-23
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance