The Eukaryotic Linear Motif resource for
Functional Sites in Proteins
Accession:
Functional site class:
Endosome-Lysosome-Basolateral sorting signals
Functional site description:
Sorting and internalisation signals directing type I transmembrane proteins from the cell surface or TGN to the lysosomal-endosomal compartment. Generally found near the C-terminus, they interact with adaptor protein complexes such as APs and GGAs.
ELMs with same func. site: TRG_LysEnd_APsAcLL_1  TRG_LysEnd_APsAcLL_3  TRG_LysEnd_GGAAcLL_1  TRG_LysEnd_GGAAcLL_2 
ELM Description:
Sorting signal located at the C-terminus of type I transmembrane proteins from the Trans Golgi Network (TGN) targeted to the lysosomal-endosomal compartment. It interacts with the VHS domain of GGAs adaptor proteins, allowing the incorporation of cargo receptors and their cargo into clathrin coated vesicles budding from the TGN. Phosphorylation of a Serine residue upstream of the motif by casein kinase 2 could regulate the recognition of the motif at the TGN. It has been demonstrated that for the cation dependent mannose 6-phosphate receptor, phosphorylation of this Ser enhances the binding of the signal to its recognition module, the VHS domain of GGAs, by creating an additional point of attcahment to it (Kato,2002).
Pattern: D..LL.{1,2}$
Pattern Probability: 9.585e-07
Present in taxons: Bos taurus Coelomata Gallus gallus Homo sapiens Mus musculus Rattus norvegicus Xenopus laevis
Interaction Domain:
VHS (PF00790) VHS domain (Stochiometry: 1 : 1)
PDB Structure: 1LF8
o See 6 Instances for TRG_LysEnd_GGAAcLL_1
o Abstract
Lysosomes are acidic compartments within cells where lumenal hydrolases degrade endogenous and internalized macromolecules. Most soluble hydrolases transit by the Trans Golgi network (TGN) where they are sorted from secretory proteins before they are directed to the endosome and then the lysosomes. The sorting events at the TGN involve transmembrane receptors which are themselves bearing sorting determinants in their cytoplasmic tails.
The interaction of such sorting signals with adaptor proteins such as APs and GGAs is responsible for the targeting of the receptors (and therefore their cargo). The acidic di Leu signals are interacting with the VHS domains of the GGAs adaptor proteins which in turn can bind to clathrin, ARF factor (regulator of coat assembly at the TGN) and other adaptors interacting with AP-1 gamma subunit. GGAs act by recruiting the receptors into TGN-derived clathrin-coated vesicles for transport to endosomes. The juxtamembrane di Leucine signals interact with AP1, AP2, AP3 and probably AP4 in trafficking events such as endocytosis, targeting to lysosomes or specialed compartments like melanosomes.
o 5 selected references:

o 6 GO-Terms:

o 6 Instances for TRG_LysEnd_GGAAcLL_1
(click table headers for sorting; Notes column: =Number of Switches, =Number of Interactions)
Acc., Gene-, NameStartEndSubsequenceLogic#Ev.OrganismNotes
P11717 IGF2R
MPRI_HUMAN
2485 2491 VSSTKLVSFHDDSDEDLLHI TP 8 Homo sapiens (Human)
P08169 IGF2R
MPRI_BOVIN
2493 2499 AAATPISTFHDDSDEDLLHV TP 1 Bos taurus (Cattle)
O75074 LRP3
LRP3_HUMAN
764 770 PPPPCSPMLEASDDEALLVC TP 2 Homo sapiens (Human)
Q99523 SORT1
SORT_HUMAN
826 831 TASHTNKSGYHDDSDEDLLE TP 4 Homo sapiens (Human)
P11456 M6PR
MPRD_BOVIN
273 279 VGDDQLGEESEERDDHLLPM TP 3 Bos taurus (Cattle)
P20645 M6PR
MPRD_HUMAN
271 277 VGDDQLGEESEERDDHLLPM TP 11 Homo sapiens (Human)
Please cite: ELM 2016-data update and new functionality of the eukaryotic linear motif resource. (PMID:26615199)

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