chromosome 14 open reading frame 108, isoform CRA_c [Homo sapiens]
Protein Classification
adaptor complexes medium subunit family protein; AP-1 complex subunit mu( domain architecture ID 10174169)
adaptor complexes medium subunit family protein similar to Homo sapiens archain that forms part of a protein complex and might be involved in vesicle assembly or sorting| AP-1 complex subunit mu is a subunit of the clathrin-associated adaptor protein complex 1 that plays a role in protein sorting at the trans-Golgi network and early endosomes (TGN/EE)
List of domain hits
| Name | Accession | Description | Interval | E-value | ||||
| AP_MuD_MHD | cd09256 | Mu-homology domain (MHD) of a adaptor protein (AP) encoded by mu-2 related death-inducing gene, ... |
2-236 | 3.16e-121 | ||||
Mu-homology domain (MHD) of a adaptor protein (AP) encoded by mu-2 related death-inducing gene, MuD (also known as MUDENG); This family corresponds to the MHD found in a protein encoded by MuD (also known as Adapter-related protein complex 5 subunit mu-1), which is distantly related to the C-terminal domain of the mu2 subunit of AP complexes that participates in clathrin-mediated endocytosis. MuD is evolutionary conserved from mammals to amphibians. It is able to induce cell death by itself and plays an important role in cell death in various tissues. : Pssm-ID: 271164 Cd Length: 276 Bit Score: 345.91 E-value: 3.16e-121
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| Name | Accession | Description | Interval | E-value | ||||
| AP_MuD_MHD | cd09256 | Mu-homology domain (MHD) of a adaptor protein (AP) encoded by mu-2 related death-inducing gene, ... |
2-236 | 3.16e-121 | ||||
Mu-homology domain (MHD) of a adaptor protein (AP) encoded by mu-2 related death-inducing gene, MuD (also known as MUDENG); This family corresponds to the MHD found in a protein encoded by MuD (also known as Adapter-related protein complex 5 subunit mu-1), which is distantly related to the C-terminal domain of the mu2 subunit of AP complexes that participates in clathrin-mediated endocytosis. MuD is evolutionary conserved from mammals to amphibians. It is able to induce cell death by itself and plays an important role in cell death in various tissues. Pssm-ID: 271164 Cd Length: 276 Bit Score: 345.91 E-value: 3.16e-121
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| Adap_comp_sub | pfam00928 | Adaptor complexes medium subunit family; This family also contains members which are coatomer ... |
1-229 | 7.70e-39 | ||||
Adaptor complexes medium subunit family; This family also contains members which are coatomer subunits. Pssm-ID: 395742 Cd Length: 259 Bit Score: 135.51 E-value: 7.70e-39
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| Name | Accession | Description | Interval | E-value | ||||
| AP_MuD_MHD | cd09256 | Mu-homology domain (MHD) of a adaptor protein (AP) encoded by mu-2 related death-inducing gene, ... |
2-236 | 3.16e-121 | ||||
Mu-homology domain (MHD) of a adaptor protein (AP) encoded by mu-2 related death-inducing gene, MuD (also known as MUDENG); This family corresponds to the MHD found in a protein encoded by MuD (also known as Adapter-related protein complex 5 subunit mu-1), which is distantly related to the C-terminal domain of the mu2 subunit of AP complexes that participates in clathrin-mediated endocytosis. MuD is evolutionary conserved from mammals to amphibians. It is able to induce cell death by itself and plays an important role in cell death in various tissues. Pssm-ID: 271164 Cd Length: 276 Bit Score: 345.91 E-value: 3.16e-121
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| AP_MHD_Cterm | cd07954 | C-terminal domain of adaptor protein (AP) complexes medium mu subunits and its homologs (MHD); ... |
1-236 | 8.30e-76 | ||||
C-terminal domain of adaptor protein (AP) complexes medium mu subunits and its homologs (MHD); This family corresponds to the C-terminal domain of heterotetrameric AP complexes medium mu subunits and its homologs existing in monomeric stonins, delta-subunit of the heteroheptameric coat protein I (delta-COPI), a protein encoded by a pro-death gene referred as MuD (also known as MUDENG, mu-2 related death-inducing gene), an endocytic adaptor syp1, the mammalian FCH domain only proteins (FCHo1/2), SH3-containing GRB2-like protein 3-interacting protein 1 (SGIP1), and related proteins. AP complexes participate in the formation of intracellular coated transport vesicles and select cargo molecules for incorporation into the coated vesicles in the late secretory and endocytic pathways. Stonins have been characterized as clathrin-dependent AP-2 mu chain related factors and may act as cargo-specific sorting adaptors in endocytosis. Coat protein complex I (COPI)-coated vesicles function in the early secretory pathway. They mediate the retrograde transport from the Golgi to the ER, and intra-Golgi transport. MuD is distantly related to the C-terminal domain of mu2 subunit of AP-2. It is able to induce cell death by itself and plays an important role in cell death in various tissues. Syp1 represents a novel type of endocytic adaptor protein that participates in endocytosis, promotes vesicle tabulation, and contributes to cell polarity and stress responses. It shares the same domain architecture with its two ubiquitously expressed mammalian counterparts, FCHo1/2, which represent key initial proteins ultimately controlling cellular nutrient uptake, receptor regulation, and synaptic vesicle retrieval. They bind specifically to the plasma membrane and recruit the scaffold proteins eps15 and intersectin, which subsequently engage the adaptor complex AP2 and clathrin, leading to coated vesicle formation. Another mammalian neuronal-specific protein SGIP1 does have a C-terminal MHD and has been classified into this family as well. It is an endophilin-interacting protein that plays an obligatory role in the regulation of energy homeostasis. It is also involved in clathrin-mediated endocytosis by interacting with phospholipids and eps15. Pssm-ID: 271157 Cd Length: 245 Bit Score: 229.60 E-value: 8.30e-76
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| Adap_comp_sub | pfam00928 | Adaptor complexes medium subunit family; This family also contains members which are coatomer ... |
1-229 | 7.70e-39 | ||||
Adaptor complexes medium subunit family; This family also contains members which are coatomer subunits. Pssm-ID: 395742 Cd Length: 259 Bit Score: 135.51 E-value: 7.70e-39
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| AP-3_Mu3_Cterm | cd09252 | C-terminal domain of medium Mu3 subunit in adaptor protein (AP) complex AP-3; AP complexes ... |
1-197 | 8.49e-06 | ||||
C-terminal domain of medium Mu3 subunit in adaptor protein (AP) complex AP-3; AP complexes participate in the formation of intracellular coated transport vesicles and select cargo molecules for incorporation into the coated vesicles in the late secretory and endocytic pathways. There are four AP complexes, AP-1, AP-2, AP-3, and AP-4, described in various eukaryotic organisms. Each AP complex consists of four subunits: two large chains (one each of gamma/alpha/delta/epsilon and beta1-4, respectively), a medium mu chain (mu1-4), and a small sigma chain (sigma1-4). Each of the four subunits from the different AP complexes exhibits similarity with each other. This family corresponds to the C-terminal domain of heterotetrameric adaptor protein complex 3 (AP-3) medium mu3 subunit, which includes two closely related homologs, mu3A (P47A, encoded by ap3m1) and mu1B (P47B, encoded by ap3m2). Mu3A is ubiquitously expressed, but mu3B is specifically expressed in neurons and neuroendocrine cells. AP-3 is particularly important for targeting integral membrane proteins to lysosomes and lysome-related organelles at trans-Golgi network (TGN) and/or endosomes, such as the yeast vacuole, fly pigment granules and mammalian melanosomes, platelet dense bodies and the secretory lysosomes of cytotoxic T lymphocytes. Unlike AP-1 and AP-2, which function in conjunction with clathrin which is a scaffolding protein participating in the formation of coated vesicles, the nature of the outer shell of AP-3 containing coats remains to be elucidated. Membrane-anchored cargo molecules interact with adaptors through short sorting signals in their cytosolic segments. Tyrosine-based endocytotic signals are one of the most important sorting signals. They are of the form Y-X-X-Phi, where Y is tyrosine, X is any amino acid and Phi is a bulky hydrophobic residue that can be Leu, Ile, Met, Phe, or Val. These kinds of sorting signals can be recognized by the C-terminal domain of AP-3 mu3 subunit, also known as Y-X-X-Phi signal-binding domain that contains two hydrophobic pockets, one for the tyrosine-binding and one for the bulky hydrophobic residue-binding. Pssm-ID: 271160 Cd Length: 251 Bit Score: 45.65 E-value: 8.49e-06
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| AP-1_Mu1B_Cterm | cd09259 | C-terminal domain of medium Mu1B subunit in epithelial cell-specific clathrin-associated ... |
17-174 | 3.66e-04 | ||||
C-terminal domain of medium Mu1B subunit in epithelial cell-specific clathrin-associated adaptor protein (AP) complex AP-1; AP complexes participate in the formation of intracellular coated transport vesicles and select cargo molecules for incorporation into the coated vesicles in the late secretory and endocytic pathways. There are four AP complexes, AP-1, AP-2, AP-3, and AP-4, described in various eukaryotic organisms. Each AP complex consists of four subunits: two large chains (one each of gamma/alpha/delta/epsilon and beta1-4, respectively), a medium mu chain (mu1-4), and a small sigma chain (sigma1-4). Each of the four subunits from different AP complexes exhibits similarity with each other. This subfamily corresponds to the C-terminal domain of heterotetrameric clathrin-associated adaptor protein complex 1 (AP-1) medium mu1B subunit encoded by ap1m2 gene exclusively expressed in polarized epithelial cells. Epithelial cell-specific AP-1 is used to sort proteins to the basolateral plasma membrane, which involves the formation of clathrin-coated vesicles (CCVs) from the trans-Golgi network (TGN). Recruitment of AP-1 to the TGN membrane is regulated by a small GTPase, ADP-ribosylation factor 1 (ARF1). The phosphorylation/dephosphorylation events can also regulate the function of AP-1. The membrane-anchored cargo molecules can be linked to the outer lattice of CCVs by AP-1. Those cargo molecules interact with adaptors through short sorting signals in their cytosolic segments. Tyrosine-based endocytotic signals are one of the most important sorting signals. They are of the form Y-X-X-Phi, where Y is tyrosine, X is any amino acid and Phi is a bulky hydrophobic residue that can be Leu, Ile, Met, Phe, or Val. These kinds of sorting signals can be recognized by the C-terminal domain of AP-1 mu1B subunit, also known as Y-X-X-Phi signal-binding domain that contains two hydrophobic pockets, one for the tyrosine-binding and one for the bulky hydrophobic reside-binding. Besides, AP-1 mu1B subunit mediates the basolateral recycling of low-density lipoprotein receptor (LDLR) and transferrin receptor (TfR) from the sorting endosomes, where the basolateral sorting signal does not belong to the tyrosine-based signals. Thus, the binding site in mu1B subunit of AP-1 for the signals of LDLR and TfR might be distinct from that for YXXPhi signals. Pssm-ID: 271167 Cd Length: 268 Bit Score: 40.77 E-value: 3.66e-04
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