3GI8

Crystal Structure of ApcT K158A Transporter Bound to 7F11 Monoclonal Fab Fragment

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.59 Å
  • R-Value Free: 0.307 
  • R-Value Work: 0.254 
  • R-Value Observed: 0.256 

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This is version 1.1 of the entry. See complete history. 


Literature

Structure and mechanism of a na+-independent amino Acid transporter.

Shaffer, P.L., Goehring, A., Shankaranarayanan, A., Gouaux, E.

(2009) Science 325: 1010-1014

  • DOI: 10.1126/science.1176088
  • Primary Citation of Related Structures:  
    3GIA, 3GI8, 3GI9

  • PubMed Abstract: 

    • Amino acid, polyamine, and organocation (APC) transporters are secondary transporters that play essential roles in nutrient uptake, neurotransmitter recycling, ionic homeostasis, and regulation of cell volume. Here, we present the crystal structure of ap ...

    Amino acid, polyamine, and organocation (APC) transporters are secondary transporters that play essential roles in nutrient uptake, neurotransmitter recycling, ionic homeostasis, and regulation of cell volume. Here, we present the crystal structure of apo-ApcT, a proton-coupled broad-specificity amino acid transporter, at 2.35 angstrom resolution. The structure contains 12 transmembrane helices, with the first 10 consisting of an inverted structural repeat of 5 transmembrane helices like the leucine transporter LeuT. The ApcT structure reveals an inward-facing, apo state and an amine moiety of lysine-158 located in a position equivalent to the sodium ion site Na2 of LeuT. We propose that lysine-158 is central to proton-coupled transport and that the amine group serves the same functional role as the Na2 ion in LeuT, thus demonstrating common principles among proton- and sodium-coupled transporters.

    Organizational Affiliation: 

    Vollum Institute, Oregon Health and Science University, 3181 Southwest Sam Jackson Park Road, Portland, OR 97239, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Uncharacterized protein MJ0609 C444Methanocaldococcus jannaschiiMutation(s): 1 
Gene Names: MJ0609
Membrane protein
Mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
Amino Acid/Polyamine/Organocation (APC) Superfamily		Protein: 
apo ApcT Na+-independent Amino Acid Transporter
Find proteins for Q58026 (Methanocaldococcus jannaschii (strain ATCC 43067 / DSM 2661 / JAL-1 / JCM 10045 / NBRC 100440))
Explore Q58026 
Go to UniProtKB:  Q58026
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
7F11 Anti-ApcT Monoclonal Fab Light Chain L220Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
7F11 Anti-ApcT Monoclonal Fab Heavy Chain H223Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.59 Å
  • R-Value Free: 0.307 
  • R-Value Work: 0.254 
  • R-Value Observed: 0.256 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.039α = 90
b = 111.188β = 90.92
c = 115.674γ = 90
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-08-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance