Introduction to AP180 (Clathrin Assembly Protein) OpenAI o3-deep-research-2025-06-26 124 citations 2026-05-01T14:07:00.757080

Introduction to AP180 (Clathrin Assembly Protein)

AP180 (Assembly Protein, ~180 kDa) is a clathrin coat assembly protein crucial for clathrin-mediated endocytosis, particularly in neural tissues. The gene symbol AP180 corresponds to the protein encoded by the SNAP91 gene in vertebrates, and the UniProt entry Q9U6M6 identifies the AP180 homolog in the longfin inshore squid Doryteuthis pealeii (pmc.ncbi.nlm.nih.gov). This squid AP180 shares the same protein family (PICALM/SNAP91 family) and domain architecture as mammalian AP180, implying a conserved function. AP180 was initially identified over 30 years ago as a highly abundant component of clathrin-coated vesicles (CCVs) in the nervous system (pmc.ncbi.nlm.nih.gov). It is a monomeric clathrin adapter/accessory protein that plays a key role in assembling clathrin-coated vesicles and selecting specific cargo during endocytosis (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Notably, AP180 is predominantly expressed in neurons (especially at presynaptic nerve terminals), whereas its ubiquitous paralog CALM (encoded by the PICALM gene) performs similar functions in non-neuronal cells (phys.org) (www.nature.com). This neuron-specific expression and function of AP180 are well conserved from invertebrates like squid to mammals, underscoring its essential role in synaptic vesicle recycling and neurotransmission (www2.mrc-lmb.cam.ac.uk) (pmc.ncbi.nlm.nih.gov).

Structural Features and Domains

AP180 belongs to the AP180/CALM family of clathrin assembly proteins and is characterized by two major domains. The N-terminal ~300-residue ANTH domain (AP180 N-terminal homology domain) is a compact, folded module responsible for membrane and cargo binding (pmc.ncbi.nlm.nih.gov) (encyclopedia.pub). The ANTH domain specifically binds to phosphatidylinositol-(4,5)-bisphosphate (PtdIns(4,5)P₂) lipids in the plasma membrane and can also bind directly to the SNARE protein VAMP2 (synaptobrevin) on synaptic vesicles (encyclopedia.pub). By anchoring to PIP₂-rich membrane patches and capturing VAMP2, the ANTH domain helps target AP180 to sites of endocytosis and ensures that critical cargo (like v-SNAREs) are incorporated into budding vesicles (encyclopedia.pub) (pmc.ncbi.nlm.nih.gov).

The C-terminal region of AP180 (also called the assembly domain) is a long intrinsically disordered region (IDR) of roughly 600 amino acids (in mammals) that contains multiple short linear motifs for protein–protein interactions (www.nature.com) (www.nature.com). This region is often subdivided into a Clathrin/Adaptor-binding (CLAP) segment and a distal segment; together they harbor numerous copies of the consensus clathrin-binding motif (typically DLL or DLF sequences) as well as motifs that bind adaptor protein 2 (AP-2) and other endocytic factors (www.nature.com) (www.nature.com). The clathrin-binding motifs in AP180’s disordered tail (as many as 12–19 copies in mammalian AP180) bind the terminal domain of the clathrin heavy chain with low affinity individually, but additively confer a high-avidity interaction (www.nature.com). Likewise, AP180 contains AP-2 appendage binding motifs such as DPF and FxDxF, which engage the α and β2 subunits (ears) of the AP-2 complex (www.nature.com). These motifs allow AP180 to simultaneously bind clathrin and AP-2, bridging the coat components. In essence, AP180’s flexible tail acts as a multivalent binding platform that nucleates clathrin lattice formation and recruits adaptor complexes at the membrane. Consistent with its disordered nature, this region does not form a stable structure on its own, but it occupies a large effective volume (causing the protein to run anomalously at ~180 kDa on SDS-PAGE despite a true mass around 90–100 kDa) (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). The ANTH and C-terminal domains are connected by a short linker, and together they enable AP180 to couple membrane binding, cargo capture, and coat assembly in one molecule (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Importantly, sequence analyses show that the ANTH domain of AP180 is highly conserved from yeast to humans (reflecting conserved function in lipid and SNARE binding), whereas the length and sequence of the disordered tail vary more across species (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). For example, in invertebrate homologs like Drosophila LAP (like-AP180) or squid AP180, the C-terminal region is somewhat shorter than in mammals, but the critical PIP₂-binding and clathrin/AP-2 interaction motifs are retained (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). This conservation suggests that the fundamental mechanism of AP180 is preserved in the squid protein (UniProt Q9U6M6) as in other organisms.

Role in Clathrin-Mediated Endocytosis

AP180 is best known for its role in clathrin-mediated endocytosis (CME), especially the retrieval of synaptic vesicles at nerve terminals (a specialized form often termed synaptic vesicle endocytosis, SVE). In CME, clathrin triskelions assemble into a polyhedral lattice that coats a patch of membrane, driving the formation of a vesicle that internalizes membrane proteins and cargo (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). AP180 functions as an accessory assembly protein (CLASP) that promotes the nucleation and growth of clathrin coats on the plasma membrane. It is highly enriched in the brain and co-purifies with clathrin-coated vesicles from neuronal tissue, indicating its tight association with clathrin coats (www2.mrc-lmb.cam.ac.uk). Of all known clathrin-binding proteins, AP180 has been shown to be one of the most potent at recruiting clathrin to membranes: in vitro reconstitution experiments demonstrated that AP180 can recruit essentially all available clathrin to a lipid monolayer, and it continues to do so in a one-to-one stoichiometry until each clathrin triskelion is associated with an AP180 molecule (www2.mrc-lmb.cam.ac.uk). This activity causes clathrin to polymerize into regular lattice “caps” on the PtdIns(4,5)P₂-containing membrane, with a geometry corresponding to the size of a typical coated vesicle (www2.mrc-lmb.cam.ac.uk). In fact, quantitative analyses have found roughly one AP180 (or CALM) per clathrin triskelion in assembled coats, a ratio similar to the major AP-2 adaptors in CCVs (pmc.ncbi.nlm.nih.gov). By tethering clathrin to the membrane and concentrating it into nascent pits, AP180 greatly enhances the efficiency of coat assembly.

Mechanistically, AP180 is targeted to endocytic sites by its ANTH domain binding to PIP₂ in the inner leaflet of the plasma membrane (www.nature.com) (www2.mrc-lmb.cam.ac.uk). Once localized to the membrane, AP180 uses its C-terminal motifs to capture clathrin. The clustering of multiple clathrin-binding motifs on a single AP180 molecule allows it to bind several clathrin heavy chain terminals at once, thus seeding the formation of a clathrin lattice. This nucleation of clathrin by AP180 was elegantly shown in a classic study where adding AP180 to lipid membranes triggered the assembly of clathrin into coated structures, whereas clathrin alone remained unassembled in solution (www2.mrc-lmb.cam.ac.uk). AP180’s action results in clathrin coat domains of relatively uniform size – notably, AP180 tends to produce smaller, ~50 nm diameter coats typical of synaptic vesicles (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). AP180 is thought to regulate vesicle size by controlling the curvature and size of the clathrin lattice that forms. Indeed, experimental perturbations of AP180 levels cause striking changes in vesicle morphology: when AP180 is absent or knocked down, clathrin-coated vesicles can grow abnormally large, while AP180 overexpression can overly restrict coat growth (www.sciencedirect.com) (pmc.ncbi.nlm.nih.gov). This ability to calibrate coat size is critical for synaptic vesicles, which must be the proper size to efficiently store and release neurotransmitters.

In addition to clathrin, AP180 interacts with the endocytic AP-2 adaptor complex (the major hub that recruits cargo). For some time, AP180’s interaction with AP-2 was assumed to be relatively weak or secondary, but recent research (2024) has revealed a much more significant AP180–AP2 interface. Using full-length AP180 IDR segments and NMR spectroscopy, researchers identified an extended high-affinity binding site in AP180’s disordered region that binds the β2 appendage (ear) domain of AP-2 with an affinity orders of magnitude stronger than its numerous weaker motifs (www.nature.com) (phys.org). This newly discovered interface suggests that AP180 can directly recruit or stabilize AP-2 at budding sites, organizing a network of interactions early in clathrin-pit formation (phys.org) (phys.org). In fact, AP180 appears to bridge AP-2 and clathrin together: it carries AP-2-binding DPF/FxDxF motifs and clathrin-binding motifs in the same molecule, and can engage both simultaneously. The 2024 study demonstrated that AP180’s intrinsically disordered domain contacts AP-2 at multiple points – many small interfaces plus one dominant binding site – creating a dynamic interaction network (phys.org) (phys.org). This network likely facilitates the co-recruitment of AP-2 adaptors along with clathrin when a new vesicle coat is initiated. In summary, AP180 acts as a multifunctional endocytic scaffold: its membrane binding targets the coat to lipid domains, its clathrin binding drives lattice assembly, and its AP-2/cargo binding ensures the coat contains the appropriate adaptor and cargo proteins.

Function in Synaptic Vesicle Recycling and Cargo Sorting

In neurons, AP180’s role is intimately tied to synaptic vesicle recycling. It is highly concentrated at presynaptic terminals, where after neurotransmitter release, synaptic vesicle membranes and proteins must be retrieved via endocytosis to form new vesicles. AP180 is essential for efficient synaptic vesicle endocytosis (SVE): genetic disruption of AP180 in multiple model organisms leads to severe defects in retrieving and reforming synaptic vesicles. For example, in Drosophila, loss of the AP180 homolog (gene lap) was shown to “severely impair the efficiency of synaptic vesicle endocytosis”, causing clathrin mislocalization at nerve terminals and a drastic increase in synaptic vesicle size (www.sciencedirect.com). Synaptic vesicles in AP180-deficient flies become abnormally enlarged and irregular, and neurotransmitter release quanta increase accordingly, indicating that AP180 normally constrains vesicle size during recycling (www.sciencedirect.com). Similarly, knockout of AP180 homologs in C. elegans (unc-11 gene) and in Dictyostelium disrupts the proper trafficking of vesicle SNARE proteins, leading to enlarged endosomal vesicles or vacuoles due to unregulated homotypic fusion (pmc.ncbi.nlm.nih.gov). In mice, a Snap91 (AP180) knockout model confirmed the critical role of AP180 in mammalian synapses: neurons from AP180-null mice showed mis-sorting of the v-SNARE VAMP2 (synaptobrevin) away from synaptic vesicles, resulting in impaired neurotransmitter release, frequent epileptic seizures, and premature death of the animals (pmc.ncbi.nlm.nih.gov). In these mice, the levels of VAMP2 in synaptic vesicles were greatly reduced, highlighting that AP180 is required to load synaptic vesicles with sufficient VAMP2 for subsequent fusion (pmc.ncbi.nlm.nih.gov). The severe phenotypes (seizures and early lethality) underscore how crucial AP180-mediated vesicle recycling is for neural circuit function and organism survival (pmc.ncbi.nlm.nih.gov).

One of AP180’s key functions is cargo selection – specifically, the sorting of SNARE proteins into newly forming vesicles. Both AP180 and CALM bind directly to the SNARE motif of VAMP2 via their ANTH domains (encyclopedia.pub). This interaction ensures that when a clathrin/AP-2 coated vesicle buds from the plasma membrane, it contains the appropriate amount of v-SNARE (synaptobrevin) necessary for it to later fuse with target membranes (such as during neurotransmitter release). Indeed, various models have demonstrated that in the absence of AP180, VAMP/Synaptobrevin fails to efficiently get recycled into synaptic vesicles: yeast lacking AP180 homologs mislocalize the VAMP analog Snc1 to the cell surface (pmc.ncbi.nlm.nih.gov), Dictyostelium AP180-null cells mis-sort VAMP7 to oversized vacuoles (pmc.ncbi.nlm.nih.gov), and AP180-knockout neurons show a substantial loss of VAMP2 from synaptic vesicles (pmc.ncbi.nlm.nih.gov). Thus, AP180 acts as a cargo-specific adaptor, critical for retrieving and sorting VAMPs/SNAREs during endocytosis (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). This role appears to be conserved across evolution, given that even yeast AP180 homologs (Yap180p in S. cerevisiae) are not required for general endocytosis but are specifically needed to internalize Snc1 (the vesicle SNARE) (pmc.ncbi.nlm.nih.gov). By assuring that each new synaptic vesicle contains the v-SNARE needed for exocytosis, AP180 maintains the competence of vesicles for future rounds of neurotransmission.

Beyond SNAREs, AP180/CALM may influence other cargos and aspects of synapse physiology. Research in cultured neurons indicates that AP180 and CALM have non-redundant roles in neurite development: knocking down AP180 selectively impaired axon outgrowth, while CALM knockdown affected dendrite development (encyclopedia.pub). In embryonic hippocampal neurons, AP180 loss was shown to abolish axon formation, whereas overexpression of AP180 (or CALM) could induce the formation of multiple axon-like processes (encyclopedia.pub). These findings suggest AP180’s endocytic function intersects with mechanisms of neuronal polarity and growth – possibly by regulating the trafficking of membrane components needed for axon specification. Additionally, AP180 has been implicated in the turnover of certain synaptic receptors. In C. elegans, unc-11 (AP180) is required for the endocytosis of ubiquitin-tagged glutamate receptors at the postsynapse (pmc.ncbi.nlm.nih.gov), hinting that AP180’s function may not be strictly presynaptic but could also assist in clathrin-dependent retrieval of receptors in other neuronal compartments. However, in vertebrates AP180 is largely neuron-specific and predominantly presynaptic, whereas CALM handles analogous tasks in other cell types and possibly postsynaptic sites (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov).

Cellular Localization and Regulation

Under normal conditions, AP180 is a cytosolic protein that transiently localizes to the plasma membrane during clathrin-coat formation. In neurons, immunogold electron microscopy and imaging studies show AP180 concentrated at the presynaptic plasma membrane, co-localized with forming clathrin-coated pits near active zones (www.sciencedirect.com). During synaptic activity, AP180 (along with clathrin and AP-2) is recruited to sites of vesicle endocytosis which often lie adjacent to neurotransmitter release sites. AP180 lacks transmembrane regions, so its membrane association is entirely via lipid/protein interactions (primarily through PIP₂ binding). Once a clathrin-coated vesicle buds off into the cytoplasm, AP180 likely dissociates (along with clathrin and AP-2) when the coat disassembles. Some evidence suggests AP180 may recycle back to the cytosol and be reused in multiple rounds of vesicle formation. Unlike CALM, which contains a nuclear-export signal and has been observed in the nucleus under some conditions, AP180 is generally not found in nuclei and is thought to function exclusively in the endocytic pathway at the cell surface (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Post-translational modifications of AP180 (such as phosphorylation or nitration) have been reported and may modulate its interactions; for instance, AP180 is subject to developmental regulation and can be phosphorylated in neurons, which might influence its activity or localization (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Additionally, lipid composition of membranes can regulate AP180’s binding – a recent biochemical study found that a specific lipid, docosahexaenoic acid (DHA)-containing phosphatidic acid, can bind to AP180’s ANTH domain and reduce its interaction with clathrin, suggesting a mechanism by which membrane lipid signals modulate clathrin coat assembly via AP180 (www.nature.com). This kind of regulation may fine-tune endocytosis efficiency in response to cellular conditions (such as changes in membrane lipid metabolites).

Latest Research and Developments (2021–2024)

Research in the past few years has continued to shed light on AP180’s function and its relevance to neurobiology and disease. A notable 2024 study in Nature Communications (Naudi-Fabra et al., 2024) mapped the interaction landscape of the AP180 disordered region for the first time at atomic resolution (phys.org) (phys.org). By analyzing each segment of the ~600 amino acid tail with NMR and other biophysical methods, the authors discovered previously unknown interaction motifs, including the high-affinity AP2-β binding site discussed above. This discovery was surprising, as prior pull-down experiments had only hinted at weak AP2 interactions; the NMR approach revealed a “much larger interaction site with an interaction strength several orders of magnitude greater than previously known sites” in AP180’s tail (phys.org) (phys.org). The study suggests that very early in clathrin-mediated endocytosis, AP180-AP2 binding helps nucleate the assembly of the entire endocytic complex (phys.org). This expands our understanding of the protein’s role: AP180 is not only a clathrin recruiter but also an organizer of the adaptor network at synapses. The same study emphasized that long intrinsically disordered proteins like AP180 can be interrogated by modern NMR, paving the way for deeper insights into other endocytic proteins that were previously intractable (phys.org) (phys.org).

Another avenue of recent research has linked AP180 to neurodegenerative disease mechanisms. AP180 has come into focus because of its connection to proteins implicated in disorders like Alzheimer’s and Parkinson’s. In Alzheimer’s disease (AD), the AP180 homolog PICALM (CALM) emerged as a top genetic risk factor in genome-wide association studies – after APOE and BIN1, PICALM is one of the most significant susceptibility loci for AD (encyclopedia.pub). PICALM’s involvement in AD is thought to stem from its role in endocytosis and possibly autophagy, processes that can influence the production and clearance of amyloid-β and tau proteins (encyclopedia.pub) (encyclopedia.pub). Since AP180 is the neuronal counterpart of PICALM, researchers have examined whether perturbations in AP180 also affect neurodegenerative pathways. Neuronal studies indicate that deficiency in AP180 (or CALM) can reduce general endocytosis and also alter the trafficking of amyloid precursor proteins and other cargo relevant to AD (encyclopedia.pub) (encyclopedia.pub). Furthermore, both AP180 and CALM are needed for healthy synaptic function, and their loss impairs synaptic recycling and potentially neuron viability, which might contribute to neurodegenerative changes. While direct mutations in SNAP91 (AP180) are not a known common cause of human disease, subtle variations or misregulation of AP180 could conceivably modulate disease progression in the brain. Interestingly, AP180 was recently linked to Parkinson’s disease (PD) through its interaction with α-synuclein, the key protein in PD pathology. A 2023 study by Varkey et al. showed that α-synuclein, a presynaptic protein, colocalizes with AP180 on the synaptic membrane and influences clathrin coat dynamics (www.sciencedirect.com) (www.sciencedirect.com). In vitro experiments demonstrated that adding α-synuclein to clathrin and AP180 caused significantly larger clathrin lattices to assemble on membranes – the average clathrin lattice area nearly doubled (from ~8,600 nm² with AP180 alone to ~15,500 nm² when α-syn was included) (www.sciencedirect.com). In neurons, clathrin-coated pits that contained both AP180 and α-synuclein were about 50% larger in diameter (~1.07 µm) than pits with AP180 alone or clathrin alone (~0.7–0.5 µm) (www.sciencedirect.com). These findings indicate that α-synuclein and AP180 cooperate to alter clathrin coat size, potentially affecting synaptic vesicle endocytosis efficiency (www.sciencedirect.com). The same study observed that upon neuronal stimulation, α-synuclein re-localizes from the synaptic vesicles to the plasma membrane, where it can engage with AP180 and clathrin (www.sciencedirect.com). Moreover, neurons lacking α/β/γ-synuclein (triple knockout) form abnormally small clathrin-coated vesicles, reinforcing that α-synuclein normally helps AP180 generate appropriately sized vesicles (www.sciencedirect.com). This interplay is of high interest because α-synuclein aggregation is central in PD; the new data suggest a physiological role of α-synuclein in endocytosis, mediated in part by AP180 (www.sciencedirect.com). Disruption of this role (either through α-syn pathology or AP180 dysfunction) could contribute to synaptic deficits observed in synucleinopathies. Thus, AP180 is being investigated in the context of neurodegenerative disease models, bridging molecular endocytosis mechanisms with larger-scale neuronal health.

It is also worth noting that AP180/CALM have been studied for their roles in synaptic development and plasticity. A study of developing hippocampal neurons found that AP180 and CALM are differentially required for axon vs. dendrite formation, as mentioned earlier (encyclopedia.pub). Another report showed that reducing AP180 and CALM levels in neurons led to defects in synaptic vesicle density and size: synapses had fewer vesicles and those vesicles were enlarged, which in turn impaired synaptic transmission (encyclopedia.pub) (encyclopedia.pub). These quantitative data (e.g. a 2013 study observed significant increases in vesicle diameter and decreases in vesicle number upon partial knockdown of AP180/CALM (encyclopedia.pub)) further highlight AP180’s role in maintaining the proper ultrastructure of synaptic vesicle pools. In combination with live-imaging and electrophysiology, such studies suggest that AP180’s activity refines the efficacy of neurotransmission – too little AP180 yields uncontrolled vesicle fusion/fission cycles and neurotransmitter release variability, while proper AP180 function keeps synaptic vesicle recycling timely and uniform.

Conclusions and Expert Perspectives

In summary, AP180 is a specialized clathrin assembly protein that orchestrates synaptic vesicle endocytosis by linking membranes, cargo, and coat proteins. It belongs to a small family of adaptors (with CALM/PICALM) that carry out both clathrin polymerization and cargo sorting functions (pmc.ncbi.nlm.nih.gov). AP180’s ANTH domain targets it to PIP₂-rich membrane zones and captures v-SNARE cargo (like VAMP2), while its disordered C-terminus recruits clathrin and AP-2, driving the formation of a clathrin-coated vesicle with the correct size and content (www2.mrc-lmb.cam.ac.uk) (pmc.ncbi.nlm.nih.gov). Decades of research, from the first purification of AP180 from brain CCVs to the latest high-resolution interaction studies, have built a consistent picture: AP180 is highly abundant in synaptic coats (about one molecule per clathrin triskelion) and is critical for producing uniform, small vesicles required for rapid neurotransmission (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Notably, while cells can perform baseline endocytosis without AP180/CALM (thanks to redundant adaptors), they cannot perfectly substitute its functions – hence the selective deficits in SNARE sorting, vesicle size, and synaptic viability when AP180 is removed (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Experts in the endocytosis field have pointed out that AP180/CALM were “often overlooked for detailed study” compared to AP-2, despite being as plentiful in coats, and only more recently have their unique roles (like regulating vesicle cargo composition and size) been fully appreciated (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov).

From a broader perspective, AP180 exemplifies how intrinsically disordered adapters function in cells: rather than a rigid enzyme with a single active site, it uses flexible multivalent interactions to bring together large complexes (clathrin coats) and ensure specificity (via cargo binding). This mode of action allows rapid assembly and disassembly, which is ideal for processes like synaptic vesicle recycling that must occur in seconds. Dysregulation of AP180 or its pathways can have outsized effects on neuronal function – for instance, improper vesicle recycling can lead to synaptic depression or neurodegenerative changes. Therefore, understanding AP180 has practical implications. In the context of disease, PICALM/CALM – the ubiquitous version of AP180 – is already a recognized player in Alzheimer’s pathology, and it may influence the clearance of neurotoxic proteins (encyclopedia.pub) (encyclopedia.pub). AP180 itself is being studied for links to Parkinson’s disease and other synucleinopathies, given the newfound cooperation between AP180 and α-synuclein in shaping vesicle coats (www.sciencedirect.com) (www.sciencedirect.com). These insights open possibilities that modulating AP180 or its interactions (for example, enhancing its function to restore proper endocytosis in neurons) could be a therapeutic angle in the future. As one research group noted in 2024, the endocytic protein network involving AP180 is more complex than previously thought, and unraveling it further will be important for “gaining a deeper understanding of the important process of endocytosis,” which might be significant for treating neurological diseases (phys.org) (phys.org). In conclusion, AP180 is a central player in synaptic vesicle endocytosis – a scaffolding protein that ensures clathrin coats form correctly and capture the right cargo – thereby maintaining efficient synaptic transmission and neuronal health. All current evidence, from squid to human, supports its role as a key facilitator of coated-vesicle formation in the nervous system, validating its functional annotation as a clathrin assembly protein.

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  18. AnnotationURLCitation(end_index=5512, start_index=5344, title='An extended interaction site determines binding between AP180 and AP2 in clathrin mediated endocytosis | Nature Communications', type='url_citation', url='https://www.nature.com/articles/s41467-024-50212-4#:~:text=match%20at%20L98%20disordered%20region,increase%20overall%20affinity%20towards%20clathrin')
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  20. AnnotationURLCitation(end_index=6396, start_index=6273, title='The Biochemical Properties and Functions of CALM and AP180 in Clathrin Mediated Endocytosis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC4194041/#:~:text=65.1,CALM%20and%20AP180%2C%20the%20role')
  21. AnnotationURLCitation(end_index=6547, start_index=6397, title='The Biochemical Properties and Functions of CALM and AP180 in Clathrin Mediated Endocytosis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC4194041/#:~:text=The%20sequence%20of%20the%20AP180,PAGE%20gels%20%5B43%5D%20at%20an')
  22. AnnotationURLCitation(end_index=6865, start_index=6726, title='Endocytic Adaptor Proteins in Health and Disease: Lessons from Model Organisms and Human Mutations - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC6912373/#:~:text=match%20at%20L1010%20consisting%20of,Early%20in%20vitro')
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  24. AnnotationURLCitation(end_index=7397, start_index=7255, title='The Biochemical Properties and Functions of CALM and AP180 in Clathrin Mediated Endocytosis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC4194041/#:~:text=sequences%20are%20100,domains%20within%20each%20of%20these')
  25. AnnotationURLCitation(end_index=7530, start_index=7398, title='The Biochemical Properties and Functions of CALM and AP180 in Clathrin Mediated Endocytosis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC4194041/#:~:text=apparent%20180%20kDa%2C%20despite%20its,The%20AD')
  26. AnnotationURLCitation(end_index=7923, start_index=7758, title='The Biochemical Properties and Functions of CALM and AP180 in Clathrin Mediated Endocytosis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC4194041/#:~:text=sequence%20from%20the%20Drosophila%20melanogaster,lysine%20in%20%CE%B11%20and%20a')
  27. AnnotationURLCitation(end_index=8079, start_index=7924, title='The Biochemical Properties and Functions of CALM and AP180 in Clathrin Mediated Endocytosis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC4194041/#:~:text=comparing%20the%20human%20CALM%20and,CALM%20and%20AP180%2C%20the%20role')
  28. AnnotationURLCitation(end_index=8791, start_index=8656, title='The Biochemical Properties and Functions of CALM and AP180 in Clathrin Mediated Endocytosis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC4194041/#:~:text=Clathrin,consisting%20of%20assembly%20protein%20180')
  29. AnnotationURLCitation(end_index=8929, start_index=8792, title='The Biochemical Properties and Functions of CALM and AP180 in Clathrin Mediated Endocytosis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC4194041/#:~:text=Clathrin%20mediated%20endocytosis%20,1%5D.%20Vesicles')
  30. AnnotationURLCitation(end_index=9377, start_index=9232, title='Clathrin and its interactions with AP180. AP180 is a brain enriched protein essential for the recycling of synaptic vesicles after exocytosis and CALM is a ubiquitous homologue. AP180 co-purifies with clathrin-coated vesicle and it functions to tether clathrin to phosphatidylinositol(4,5)bisphosphate (PtdIns(4,5)P2) containing membranes. Thus AP180 has a membrane binding domain (ANTH domain) and a clathrin/adaptor binding domain.', type='url_citation', url='https://www2.mrc-lmb.cam.ac.uk/groups/hmm/AP180/Clathrin.html#:~:text=Image%20%20%20,other%20parts%20of%20these%20Web')
  31. AnnotationURLCitation(end_index=9905, start_index=9759, title='Clathrin and its interactions with AP180. AP180 is a brain enriched protein essential for the recycling of synaptic vesicles after exocytosis and CALM is a ubiquitous homologue. AP180 co-purifies with clathrin-coated vesicle and it functions to tether clathrin to phosphatidylinositol(4,5)bisphosphate (PtdIns(4,5)P2) containing membranes. Thus AP180 has a membrane binding domain (ANTH domain) and a clathrin/adaptor binding domain.', type='url_citation', url='https://www2.mrc-lmb.cam.ac.uk/groups/hmm/AP180/Clathrin.html#:~:text=clathrin,electron%20microscopy%20below%3A%20%204')
  32. AnnotationURLCitation(end_index=10237, start_index=10091, title='Clathrin and its interactions with AP180. AP180 is a brain enriched protein essential for the recycling of synaptic vesicles after exocytosis and CALM is a ubiquitous homologue. AP180 co-purifies with clathrin-coated vesicle and it functions to tether clathrin to phosphatidylinositol(4,5)bisphosphate (PtdIns(4,5)P2) containing membranes. Thus AP180 has a membrane binding domain (ANTH domain) and a clathrin/adaptor binding domain.', type='url_citation', url='https://www2.mrc-lmb.cam.ac.uk/groups/hmm/AP180/Clathrin.html#:~:text=clathrin,electron%20microscopy%20below%3A%20%204')
  33. AnnotationURLCitation(end_index=10548, start_index=10408, title='The Biochemical Properties and Functions of CALM and AP180 in Clathrin Mediated Endocytosis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC4194041/#:~:text=match%20at%20L172%20The%20other,CALM%20and%20AP180%20are')
  34. AnnotationURLCitation(end_index=10958, start_index=10820, title='An extended interaction site determines binding between AP180 and AP2 in clathrin mediated endocytosis | Nature Communications', type='url_citation', url='https://www.nature.com/articles/s41467-024-50212-4#:~:text=One%20such%20CLASP%20is%20the,10%7D%20and%20seems%20to%20be')
  35. AnnotationURLCitation(end_index=11104, start_index=10959, title='Clathrin and its interactions with AP180. AP180 is a brain enriched protein essential for the recycling of synaptic vesicles after exocytosis and CALM is a ubiquitous homologue. AP180 co-purifies with clathrin-coated vesicle and it functions to tether clathrin to phosphatidylinositol(4,5)bisphosphate (PtdIns(4,5)P2) containing membranes. Thus AP180 has a membrane binding domain (ANTH domain) and a clathrin/adaptor binding domain.', type='url_citation', url='https://www2.mrc-lmb.cam.ac.uk/groups/hmm/AP180/Clathrin.html#:~:text=Image%20%20%20,other%20parts%20of%20these%20Web')
  36. AnnotationURLCitation(end_index=11765, start_index=11619, title='Clathrin and its interactions with AP180. AP180 is a brain enriched protein essential for the recycling of synaptic vesicles after exocytosis and CALM is a ubiquitous homologue. AP180 co-purifies with clathrin-coated vesicle and it functions to tether clathrin to phosphatidylinositol(4,5)bisphosphate (PtdIns(4,5)P2) containing membranes. Thus AP180 has a membrane binding domain (ANTH domain) and a clathrin/adaptor binding domain.', type='url_citation', url='https://www2.mrc-lmb.cam.ac.uk/groups/hmm/AP180/Clathrin.html#:~:text=clathrin,electron%20microscopy%20below%3A%20%204')
  37. AnnotationURLCitation(end_index=12057, start_index=11936, title='The Biochemical Properties and Functions of CALM and AP180 in Clathrin Mediated Endocytosis - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC4194041/#:~:text=cargo.%20The%20CALM%20AP180%20N,VAMPs')
  38. AnnotationURLCitation(end_index=12233, start_index=12058, title='Endocytic Adaptor Proteins in Health and Disease: Lessons from Model Organisms and Human Mutations - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC6912373/#:~:text=match%20at%20L1014%20studies%20demonstrated,Clathrin%20triskelia%20into%20properly%20shaped')
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