4j2g | pdb_00004j2g

Atg13 HORMA domain

spinqualitylabelsall models 4j2g, resolution 2.29Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4j2g is a 2 chain structure with sequence from Lachancea thermotolerans cbs 6340. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SO4 NonStd Res: MSE Gene: KLTH0A00704g (Lachancea thermotolerans CBS 6340) Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed Autophagy-related 13 (Atg13) is a key early-acting factor in autophagy and the major locus for nutrient-dependent regulation of autophagy by Tor. The 2.3-A resolution crystal structure of the N-terminal domain of Atg13 reveals a previously unidentified HORMA (Hop1p, Rev1p and Mad2) domain similar to that of the spindle checkpoint protein Mad2. Mad2 has two different stable conformations, O-Mad2 and C-Mad2, and the Atg13 HORMA structure corresponds to the C-Mad2 state. The Atg13 HORMA domain is required for autophagy and for recruitment of the phosphatidylinositol (PI) 3-kinase subunit Atg14 but is not required for Atg1 interaction or Atg13 recruitment to the preautophagosomal structure. The Atg13 HORMA structure reveals a pair of conserved Arg residues that constitute a putative phosphate sensor. One of the Arg residues is in the region corresponding to the "safety belt" conformational switch of Mad2, suggesting conformational regulation of phosphate binding. These two Arg residues are essential for autophagy, suggesting that the Atg13 HORMA domain could function as a phosphoregulated conformational switch. A HORMA domain in Atg13 mediates PI 3-kinase recruitment in autophagy.,Jao CC, Ragusa MJ, Stanley RE, Hurley JH Proc Natl Acad Sci U S A. 2013 Mar 18. PMID:23509291 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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