3MAA

Complex of GS-Alpha with the Catalytic Domains of Mammalian Adenylyl Cyclase: Complex with Adenosine 5-O-(l-Thiophosphate) and Low Ca Concentration


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.239 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis for inhibition of mammalian adenylyl cyclase by calcium.

Mou, T.C.Masada, N.Cooper, D.M.Sprang, S.R.

(2009) Biochemistry 48: 3387-3397

  • DOI: 10.1021/bi802122k
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Type V and VI mammalian adenylyl cyclases (AC5, AC6) are inhibited by Ca(2+) at both sub- and supramicromolar concentration. This inhibition may provide feedback in situations where cAMP promotes opening of Ca(2+) channels, allowing fine control of c ...

    Type V and VI mammalian adenylyl cyclases (AC5, AC6) are inhibited by Ca(2+) at both sub- and supramicromolar concentration. This inhibition may provide feedback in situations where cAMP promotes opening of Ca(2+) channels, allowing fine control of cardiac contraction and rhythmicity in cardiac tissue where AC5 and AC6 predominate. Ca(2+) inhibits the soluble AC core composed of the C1 domain of AC5 (VC1) and the C2 domain of AC2 (IIC2). As observed for holo-AC5, inhibition is biphasic, showing "high-affinity" (K(i) = approximately 0.4 microM) and "low-affinity" (K(i) = approximately 100 microM) modes of inhibition. At micromolar concentration, Ca(2+) inhibition is nonexclusive with respect to pyrophosphate (PP(i)), a noncompetitive inhibitor with respect to ATP, but at >100 microM Ca(2+), inhibition appears to be exclusive with respect to PP(i). The 3.0 A resolution structure of Galphas.GTPgammaS/forskolin-activated VC1:IIC2 crystals soaked in the presence of ATPalphaS and 8 microM free Ca(2+) contains a single, loosely coordinated metal ion. ATP soaked into VC1:IIC2 crystals in the presence of 1.5 mM Ca(2+) is not cyclized, and two calcium ions are observed in the 2.9 A resolution structure of the complex. In both of the latter complexes VC1:IIC2 adopts the "open", catalytically inactive conformation characteristic of the apoenzyme, in contrast to the "closed", active conformation seen in the presence of ATP analogues and Mg(2+) or Mn(2+). Structures of the pyrophosphate (PP(i)) complex with 10 mM Mg(2+) (2.8 A) or 2 mM Ca(2+) (2.7 A) also adopt the open conformation, indicating that the closed to open transition occurs after cAMP release. In the latter complexes, Ca(2+) and Mg(2+) bind only to the high-affinity "B" metal site associated with substrate/product stabilization. Ca(2+) thus stabilizes the inactive conformation in both ATP- and PP(i)-bound states.


    Organizational Affiliation

    Center for Biomolecular Structure and Dynamics and Division of Biological Sciences, The University of Montana, Missoula, Montana 59812, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Adenylate cyclase type 5
A
225Canis lupus familiarisMutation(s): 1 
Gene Names: ADCY5
EC: 4.6.1.1
Find proteins for P30803 (Canis lupus familiaris)
Go to Gene View: ADCY5
Go to UniProtKB:  P30803
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Adenylate cyclase type 2
B
212Rattus norvegicusMutation(s): 0 
Gene Names: Adcy2
EC: 4.6.1.1
Find proteins for P26769 (Rattus norvegicus)
Go to UniProtKB:  P26769
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Guanine nucleotide-binding protein G(s) subunit alpha isoforms short
C
394Bos taurusMutation(s): 0 
Gene Names: GNAS (GNAS1)
Find proteins for P04896 (Bos taurus)
Go to Gene View: GNAS
Go to UniProtKB:  P04896
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

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C
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
CA
Query on CA

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A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
FKP
Query on FKP

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A
METHYLPIPERAZINOFORSKOLIN
C30 H50 N2 O7
UNNWBVSRDSMIDQ-QAMJDCALSA-N
 Ligand Interaction
MG
Query on MG

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C
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
GSP
Query on GSP

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C
5'-GUANOSINE-DIPHOSPHATE-MONOTHIOPHOSPHATE
C10 H16 N5 O13 P3 S
XOFLBQFBSOEHOG-UUOKFMHZSA-N
 Ligand Interaction
TAT
Query on TAT

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Download CCD File 
B
ADENOSINE-5'-RP-ALPHA-THIO-TRIPHOSPHATE
C10 H16 N5 O12 P3 S
ROYJKVPBJVNHCQ-AJBXOXQOSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.239 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 118.744α = 90.00
b = 133.722β = 90.00
c = 70.992γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
HKL-2000data reduction
REFMACrefinement
WEBICEdata collection
PHASESphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2010-03-23 
  • Released Date: 2010-04-07 
  • Deposition Author(s): Mou, T.-C., Sprang, S.R.
  • This entry supersedes: 3E8A

Revision History 

  • Version 1.0: 2010-04-07
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2013-02-13
    Type: Atomic model