3KXC image
Deposition Date 2009-12-02
Release Date 2010-04-21
Last Version Date 2023-11-01
Entry Detail
PDB ID:
3KXC
Title:
Mutant transport protein
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.00 Å
R-Value Free:
0.23
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Trafficking protein particle complex subunit 3
Gene (Uniprot):TRAPPC3
Mutations:C68A
Chain IDs:A
Chain Length:194
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Trafficking protein particle complex subunit 6B
Gene (Uniprot):TRAPPC6B
Chain IDs:B (auth: C)
Chain Length:158
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Characterization of the self-palmitoylation activity of the transport protein particle component Bet3
Cell.Mol.Life Sci. 67 2653 2664 (2010)
PMID: 20372964 DOI: 10.1007/s00018-010-0358-y

Abstact

Bet3, a transport protein particle component involved in vesicular trafficking, contains a hydrophobic tunnel occupied by a fatty acid linked to cysteine 68. We reported that Bet3 has a unique self-palmitoylating activity. Here we show that mutation of arginine 67 reduced self-palmitoylation of Bet3, but the effect was compensated by increasing the pH. Thus, arginine helps to deprotonate cysteine such that it could function as a nucleophile in the acylation reaction which is supported by the structural analysis of non-acylated Bet3. Using fluorescence spectroscopy we show that long-chain acyl-CoAs bind with micromolar affinity to Bet3, whereas shorter-chain acyl-CoAs do not interact. Mutants with a deleted acylation site or a blocked tunnel bind to Pal-CoA, only the latter with slightly reduced affinity. Bet3 contains three binding sites for Pal-CoA, but their number was reduced to two in the mutant with an obstructed tunnel, indicating that Bet3 contains binding sites on its surface.

Legend

Protein

Chemical

Disease

Primary Citation of related structures