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item-0 at level 0: unspecified: group _root_
item-1 at level 1: title: Characterization of TSET, an anc ... idespread membrane trafficking complex
item-2 at level 1: paragraph: Jennifer Hirst; Cambridge Instit ... mbridge , Cambridge , United Kingdom
item-3 at level 1: text: The heterotetrameric AP and F-CO ... p://dx.doi.org/10.7554/eLife.02866.002
item-4 at level 1: section_header: Introduction
item-5 at level 2: text: The evolution of eukaryotes some ... mbers of the AP/COPI subunit families.
item-6 at level 1: section_header: Diagrams of APs and F-COPI.
item-7 at level 2: text: (A) Structures of the assembled ... ements 14, Figure 1—source data 1, 2.
item-8 at level 1: section_header: Summary table of all subunits identified using reverse HHpred.
item-9 at level 2: text: The lighter shading indicates wh ... GI). The new complex is called TSET.
item-10 at level 1: section_header: The search for novel AP-related complexes
item-11 at level 2: text: Because we were unable to find a ... -based searching (Hirst et al., 2011).
item-12 at level 2: text: In addition to known proteins, o ... ly members are only 14.63% identical).
item-13 at level 1: section_header: TSET: a new trafficking complex
item-14 at level 2: text: To determine whether the four ne ... xcess, probably due to overexpression.
item-15 at level 2: text: Interestingly, two of the other ... r the newly identified heterotetramer.
item-16 at level 2: text: The other three proteins in the ... embrane and/or endosomal compartments.
item-17 at level 1: section_header: Characterisation of the TSET complex in Dictyostelium.
item-18 at level 2: text: (A) Western blots of axenic D. d ... nts 1 and 2, Figure 2; Videos 1 and 2.
item-19 at level 1: section_header: Characterisation of the TSET complex in Dictyostelium
item-20 at level 2: text: One of the key properties of coa ... lasma membrane) from a cytosolic pool.
item-21 at level 2: text: Silencing TPLATE in Arabidopsis ... ive without a functional TSET complex.
item-22 at level 2: text: Very recently, the discoverers o ... stelium produce a very mild phenotype.
item-23 at level 1: section_header: TSET is ancient and widespread in eukaryotes
item-24 at level 2: text: When TPLATE was discovered in Ar ... complex was present prior to the LECA.
item-25 at level 2: text: Although TSET is clearly ancient ... stinct from the known heterotetramers.
item-26 at level 2: text: Phylogenetic analysis of the TTR ... a et al., 2010; Asensio et al., 2013).
item-27 at level 2: text: Although TSET is deduced to have ... sted in our pre-opisthokont ancestors.
item-28 at level 1: section_header: Distribution of TSET subunits.
item-29 at level 2: text: (A) Coulson plot showing the dis ... data 1, Figure 3—figure supplement 1.
item-30 at level 1: section_header: Evolution of TSET.
item-31 at level 2: text: (A) Simplified diagram of the co ... also Figure 4—figure supplements 110.
item-32 at level 1: section_header: Phylogenetic analysis of TPLATE, ... obustly excluded from the β-COP clade.
item-33 at level 2: text: In this and all other figure sup ... es are denoted by symbols (see inset).
item-34 at level 1: section_header: Conclusions
item-35 at level 2: text: TSET is the latest addition to a ... nts) adding lineage-specific function.
item-36 at level 2: text: Studies on the muniscins may hel ... sms as the clathrin pathway took over.
item-37 at level 2: text: Thus, our bioinformatics tool, r ... to the history of the eukaryotic cell.
item-38 at level 1: section_header: Construction of the reverse HHpred database
item-39 at level 2: text: The proteomes of various organis ... able to find the entire TSET complex.
item-40 at level 1: section_header: Data assimilation
item-41 at level 2: text: The large adaptor subunits share ... ptin), a shared homology is suggested.
item-42 at level 1: section_header: Dictyostelium: the search for TSPOON and TCUP
item-43 at level 2: text: While searching for genes encodi ... . purpureum TCUP) (www.dictybase.org).
item-44 at level 1: section_header: Dictyostelium expression constructs
item-45 at level 2: text: The σ-like (TSPOON) coding seque ... omoter (pDT61 and pDT58 respectively).
item-46 at level 1: section_header: Dictyostelium cell culture and transformation
item-47 at level 2: text: All of the methods used for cell ... at Bio-protocol (Hirst et al., 2015).
item-48 at level 2: text: D. discoideum Ax2-derived strain ... medium containing 10 µg/ml blasicidin.
item-49 at level 1: section_header: Dictyostelium microscopy and fractionation
item-50 at level 2: text: Cells were transformed with GFP ... N-GFP and A15_TSPOON expressing cells.
item-51 at level 2: text: For fractionation, cells express ... ody against GFP (Seaman et al., 2009).
item-52 at level 1: section_header: Dictyostelium pulldowns and proteomics
item-53 at level 2: text: Pulldowns were performed using D ... tham, MA) (Antrobus and Borner, 2011).
item-54 at level 2: text: Proteins that came down in the n ... were then log-transformed and plotted.
item-55 at level 1: section_header: Dictyostelium gene disruption
item-56 at level 2: text: The TSPOON disruption plasmid wa ... nding sites in pLPBLP, yielding pDT70.
item-57 at level 2: text: Growth of control vs mutant stra ... ing the resultant plaques (Kay, 1982).
item-58 at level 1: section_header: Endocytosis assays
item-59 at level 2: text: Membrane uptake was measured in ... time is 1/slope of the initial phase.
item-60 at level 2: text: Fluid phase uptake was measured ... otein content (Traynor and Kay, 2007).
item-61 at level 1: section_header: Comparative genomics
item-62 at level 2: text: Sequences from Arabidopsis thali ... t generator v1.5 (Field et al., 2013).
item-63 at level 1: section_header: Phylogenetic analysis
item-64 at level 2: text: Identified sequences were combin ... are available in Supplementary file 1.
item-65 at level 1: section_header: Homology modeling
item-66 at level 2: text: The Phyre v2.0 web server (Kelle ... alized using MacPyMOL (www.pymol.org).
item-67 at level 1: section_header: Figures
item-69 at level 1: picture
item-69 at level 2: caption: Figure 1. Diagrams of APs and F-COPI. (A) Structures of the assembled complexes. All six complexes are heterotetramers; the individual subunits are called adaptins in the APs (e.g., γ-adaptin) and COPs in COPI (e.g., γ-COP). The two large subunits in each complex are structurally similar to each other. They are arranged with their N-terminal domains in the core of the complex, and these domains are usually (but not always) followed by a flexible linker and an appendage domain. The medium subunits consist of an N-terminal longin-related domain followed by a C-terminal μ homology domain (MHD). The small subunits consist of a longin-related domain only. (B) Jpred secondary structure predictions of some of the known subunits (all from Homo sapiens), together with new family members from Dictyostelium discoideum (Dd) and Arabidopsis thaliana (At). See also Figure 1—figure supplements 14, Figure 1—source data 1, 2. DOI:http://dx.doi.org/10.7554/eLife.02866.003
item-71 at level 1: picture
item-71 at level 2: caption: Figure 1—figure supplement 1. PDB entries used to search for adaptor-related proteins. DOI:http://dx.doi.org/10.7554/eLife.02866.006
item-73 at level 1: picture
item-73 at level 2: caption: Figure 1—figure supplement 2. Summary table of all subunits identified using reverse HHpred. The lighter shading indicates where an orthologue was found either below the arbitrary cut-off, by using NCBI BLAST (see Figure 1—figure supplement 3), or by searching a genomic database (e.g., AP-1 μ1 |Naegr1|35900|, JGI). The new complex is called TSET. DOI:http://dx.doi.org/10.7554/eLife.02866.007
item-75 at level 1: picture
item-75 at level 2: caption: Figure 1—figure supplement 3. Subunits that failed to be identified using reverse HHpred, but were identified by homology searching using NCBI BLAST. DOI:http://dx.doi.org/10.7554/eLife.02866.008
item-77 at level 1: picture
item-77 at level 2: caption: Figure 1—figure supplement 4. TSET orthologues in different species. The orthologues were identified by reverse HHpred, except for those in italics, which were found by BLAST searching (NCBI) using closely related organisms. TTRAY1 and TTRAY2 were initially identified by proteomics in a complex with TSET, but could also have been predicted by reverse HHpred as closely related to β′-COP using the PDB structure, 3mkq_A. In all other organisms TTRAY1 and TTRAY2 were identified by NCBI BLAST (italics). Note that orthologues of TSAUCER in P. patens, and TTRAY 2 in M. pusilla were identified in Phytozome, which is a genomic database hosted by Joint Genome Institute (JGI). Note orthologues of TCUP in D. purpureum and TSPOON in D. discoideum were identified by searching genomic sequences using closely related sequences, and have been manually appended in DictyBase. In these cases corresponding sequences are not at present found at NCBI. Whilst S. moellendorffii and V. vinifera were included in the reverse HHpred database, they were not included in the Coulson plot. DOI:http://dx.doi.org/10.7554/eLife.02866.009
item-79 at level 1: picture
item-79 at level 2: caption: Figure 1—figure supplement 5. Identification of ENTH/ANTH domain proteins and the AP complexes with which they associate, using reverse HHpred. Reverse HHpred searches were initiated using the key words epsin or ENTH. The PDB structures used were: 1eyh_A (Chain A, Crystal Structure Of The Epsin N-Terminal Homology (Enth) Domain At 1.56 Angstrom Resolution); 1inz_A (Chain A, Solution Structure Of The Epsin N-Terminal Homology (Enth) Domain Of Human Epsin); 1xgw_A (Chain A, The Crystal Structure Of Human Enthoprotin N-Terminal Domain); 3onk_A (Chain A, Yeast Ent3_enth Domain), and the output was assimilated in Excel as described for the adaptors. The identity of the hits was determined using NCBI BLAST searching. Note that all of the organisms that have lost AP-4 have also lost its binding partner, tepsin. DOI:http://dx.doi.org/10.7554/eLife.02866.010
item-81 at level 1: picture
item-81 at level 2: caption: Figure 2. Characterisation of the TSET complex in Dictyostelium. (A) Western blots of axenic D. discoideum expressing either GFP-tagged small subunit (σ-like) or free GFP, under the control of the Actin15 promoter, labelled with anti-GFP. The Ax2 parental cell strain was included as a control, and an antibody against the AP-2α subunit was used to demonstrate that equivalent amounts of protein were loaded. (B) Coomassie blue-stained gel of GFP-tagged small subunit and associated proteins immunoprecipitated with anti-GFP. The GFP-tagged protein is indicated with a red asterix. (C) iBAQ ratios (an estimate of molar ratios) for the proteins that consistently coprecipitated with the GFP-tagged small subunit. All appear to be equimolar with each other, and the higher ratios for the small (σ-like/TSPOON) subunit and GFP are likely to be a consequence of their overexpression, which we also saw in a repeat experiment in which we used the small subunit's own promoter (Figure 2—figure supplement 1). (D) Predicted structure of the N-terminal portion of D. discoideum TTRAY1, shown as a ribbon diagram. (E) Stills from live cell imaging of cells expressing either TSPOON-GFP or free GFP, using TIRF microscopy. The punctate labelling in the TSPOON-GFP-expressing cells indicates that some of the construct is associated with the plasma membrane. See Videos 1 and 2. (F) Western blots of extracts from cells expressing either TSPOON-GFP or free GFP. The post-nuclear supernatants (PNS) were centrifuged at high speed to generate supernatant (cytosol) and pellet fractions. Equal protein loadings were probed with anti-GFP. Whereas the GFP was exclusively cytosolic, a substantial proportion of TSPOON-GFP fractionated into the membrane-containing pellet. (G) Mean generation time (MGT) for control (Ax2) and TSPOON knockout cells. The knockout cells grew slightly faster than the control. (H) Differentiation of the Ax2 control strain and two TSPOON knockout strains (1725 and 1727). All three strains produced fruiting bodies upon starvation. (I) Assay for fluid phase endocytosis. The control and knockout strains took up FITC-dextran at similar rates. (J) Assay for endocytosis of membrane, labelled with FM1-43, showing the time taken to internalise the entire surface area. The knockout strains took significantly longer than the control (*p<0.05; **p<0.01). See also Figure 2—figure supplements 1 and 2, Figure 2; Videos 1 and 2. DOI:http://dx.doi.org/10.7554/eLife.02866.011
item-83 at level 1: picture
item-83 at level 2: caption: Figure 2—figure supplement 1. Further characterisation of Dictyostelium TSET. (A) iBAQ ratios for the proteins that coprecipitated with TSPOON-GFP, normalized to the median abundance of all proteins across five experiments. ND = not detected. (B) Fluorescence and phase contrast micrographs of cells expressing GFP-tagged TSPOON under the control of its own promoter (Prom-TSPOON-GFP). The construct appears mainly cytosolic. (C) Homology modeling of TTRAYs from A. thaliana, D. discoideum, and N. gruberi, revealing two β-propeller domains followed by an α-solenoid. (D) Disruption of the TSPOON gene. PCR was used to amplify either the wild-type TSPOON gene (in Ax2) or the disrupted TSPOON gene. The resulting products were either left uncut (U) or digested with SmaI (S), which should not cut the wild-type gene, but should cleave the disrupted gene into three bands. Several clones are shown, including HM1725 (200/1 A1). (E) Spore viability after detergent treatment was used to test for integrity of the cellulosic spore and the ability to hatch in a timely manner. The control (Ax2) strain and the knockout (HM1725) strain both showed good viability. (F) Expansion rate of plaques on bacterial lawns. The rates for control (Ax2) and knockout (HM1725, 1727, and 1728) strains were similar initially, but by 2 days the control plaques were larger. (G) Micrographs of plaques from control and knockout strains. DOI:http://dx.doi.org/10.7554/eLife.02866.012
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item-85 at level 2: caption: Figure 2—figure supplement 2. Distribution of secG. DOI:http://dx.doi.org/10.7554/eLife.02866.013
item-87 at level 1: picture
item-87 at level 2: caption: Figure 2—figure supplement 3. Distribution of vacuolins. DOI:http://dx.doi.org/10.7554/eLife.02866.014
item-89 at level 1: picture
item-89 at level 2: caption: Video 1. Related to Figure 2. TIRF microscopy of D. discoideum expressing TSPOON-GFP, expressed off its own promoter in TSPOON knockout cells. One frame was collected every second. Dynamic puncta can be seen, indicating that the construct forms patches at the plasma membrane. DOI:http://dx.doi.org/10.7554/eLife.02866.015
item-91 at level 1: picture
item-91 at level 2: caption: Video 2. Related to Figure 2. TIRF microscopy of D. discoideum expressing free GFP, driven by the Actin15 promoter in TSPOON knockout cells. One frame was collected every second. The signal is diffuse and cytosolic. DOI:http://dx.doi.org/10.7554/eLife.02866.016
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item-93 at level 2: caption: Figure 3. Distribution of TSET subunits. (A) Coulson plot showing the distribution of TSET in a diverse set of representative eukaryotes. Presence of the entire complex in at least four supergroups suggests its presence in the last eukaryotic common ancestor (LECA) with frequent secondary loss. Solid sectors indicate sequences identified and classified using BLAST and HMMer. Empty sectors indicate taxa in which no significant orthologues were identified. Filled sectors in the Holozoa and Fungi represent F-BAR domain-containing FCHo and Syp1, respectively. Taxon name abbreviations are inset. Names in bold indicate taxa with all six components. (B) Deduced evolutionary history of TSET as present in the LECA but independently lost multiple times, either partially or completely. See also Figure 3—source data 1, Figure 3—figure supplement 1. DOI:http://dx.doi.org/10.7554/eLife.02866.017
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item-95 at level 2: caption: Figure 3—figure supplement 1. Models used for phylogenetic analyses. WC = with COPI; WOC = without COPI. DOI:http://dx.doi.org/10.7554/eLife.02866.019
item-97 at level 1: picture
item-97 at level 2: caption: Figure 4. Evolution of TSET. (A) Simplified diagram of the concatenated tree for TSET, APs, and COPI, based on Figure 4—figure supplement 8. Numbers indicate posterior probabilities for MrBayes and PhyloBayes and maxium-likelihood bootstrap values for PhyML and RAxML, in that order. (B) Schematic diagram of TSET. (C) Possible evolution of the three families of heterotetramers: TSET, APs, and COPI. We propose that the earliest ancestral complex was a likely a heterotrimer or a heterohexamer formed from two identical heterotrimers, containing large (red), small (yellow), and scaffolding (blue) subunits. All three of these proteins were composed of known ancient building blocks of the membrane-trafficking system (Vedovato et al., 2009): α-solenoid domains in both the large and scaffolding subunits; two β-propellers in the scaffolding subunit; and a longin domain forming the small subunit. The gene encoding the large subunit then duplicated and mutated to generate the two distinct types of large subunits (red and magenta), and the gene encoding the small subunit also duplicated and mutated (yellow and orange), with one of the two proteins (orange) acquiring a μ homology domain (MHD) to form the ancestral heterotetramer, as proposed by Boehm and Bonifacino (12). However, the scaffolding subunit remained a homodimer. Upon diversification into three separate families, the scaffolding subunit duplicated independently in TSET and COPI, giving rise to TTRAY1 and TTRAY2 in TSET, and to α- and β′-COP in COPI. COPI also acquired a new subunit, ε-COP (purple). The scaffolding subunit may have been lost in the ancestral AP complex, as indicated in the diagram; however, AP-5 is tightly associated with two other proteins, SPG11 and SPG15, and the relationship of SPG11 and SPG15 to TTRAY/B-COPI remains unresolved, so it is possible that SPG11 and SPG15 are highly divergent descendants of the original scaffolding subunits. The other AP complexes are free heterotetramers when in the cytosol, but membrane-associated AP-1 and AP-2 interact with another scaffold, clathrin; and AP-3 has also been proposed to interact transiently with a protein with similar architecture, Vps41 (Rehling et al., 1999; Cabrera et al., 2010; Asensio et al., 2013). So far no scaffold has been proposed for AP-4. Although the order of emergence of TSET and COP relative to adaptins is unresolved, our most recent analyses indicate that, contrary to previous reports (Hirst et al., 2011), AP-5 diverged basally within the adaptin clade, followed by AP-3, AP-4, and APs 1 and 2, all prior to the LECA. This still suggests a primordial bridging of the secretory and phagocytic systems prior to emergence of a trans-Golgi network. The muniscins arose much later, in ancestral opisthokonts, from a translocation of the TSET MHD-encoding sequence to a position immediately downstream from an F-BAR domain-encoding sequence. Another translocation occurred in plants, where an SH3 domain-coding sequence was inserted at the 3 end of the TSAUCER-coding sequence. See also Figure 4—figure supplements 110. DOI:http://dx.doi.org/10.7554/eLife.02866.020
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item-99 at level 2: caption: Figure 4—figure supplement 1. Phylogenetic analysis of TPLATE, β-COP, and β-adaptin, with TPLATE robustly excluded from the β-COP clade. In this and all other figure supplements to Figure 4, AP subunits are boxed in blue, F-COPI subunits are boxed in red, and subunits of TSET are boxed in yellow. Node support for critical nodes is shown. Numbers indicate Bayesian posterior probabilities (MrBayes) and bootstrap support from Maximum-likelihood analysis (RAxML). Support values for other nodes are denoted by symbols (see inset). DOI:http://dx.doi.org/10.7554/eLife.02866.021
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item-101 at level 2: caption: Figure 4—figure supplement 2. Phylogenetic analysis of TPLATE and β-adaptin subunits (β-COP removed) showing, with weak support, that TPLATE is excluded from the adaptin clade. DOI:http://dx.doi.org/10.7554/eLife.02866.022
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item-103 at level 2: caption: Figure 4—figure supplement 3. Phylogenetic analysis of TSAUCER, γ-COP, and γαδεζ-adaptin subunits, with TCUP robustly excluded from the γ-COP clade, and weakly excluded from the adaptin clade. DOI:http://dx.doi.org/10.7554/eLife.02866.023
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item-105 at level 2: caption: Figure 4—figure supplement 4. Phylogenetic analysis of TSAUCER and γαδεζ-adaptin subunits (γ-COP removed), showing weak support for the exclusion of TSAUCER from the adaptin clade. DOI:http://dx.doi.org/10.7554/eLife.02866.024
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item-107 at level 2: caption: Figure 4—figure supplement 5. Phylogenetic analysis of TCUP, δ-COP, and μ-adaptin subunits, with TSAUCER robustly excluded from the δ-COP clade and weakly excluded from the adaptin clade. DOI:http://dx.doi.org/10.7554/eLife.02866.025
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item-109 at level 2: caption: Figure 4—figure supplement 6. Phylogenetic analysis of TCUP and μ-adaptin subunits (δ-COP removed), showing weak support for the exclusion of TCUP from the adaptin clade. DOI:http://dx.doi.org/10.7554/eLife.02866.026
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item-111 at level 2: caption: Figure 4—figure supplement 7. Phylogenetic analysis of TSPOON with ζ-COP and σadaptin subunits with moderate support for the exclusion of TSPOON from both the COPI and adaptin clades, in addition to moderate support for the monophyly of the TSPOON clade. DOI:http://dx.doi.org/10.7554/eLife.02866.027
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item-113 at level 2: caption: Figure 4—figure supplement 8. TSET is a phylogenetically distinct lineage from F-COPI and the AP complexes. Phylogenetic analysis of the heterotetrameric complexes: F-COPI (orange), TSET (purple), and AP (magenta, blue, red, green, and yellow for 5, 3, 1, 2, and 4, respectively), shows strong, weak, and moderate support for clades of each complex, respectively. Node support for critical nodes is shown. Numbers indicate Bayesian posterior probabilities (MrBayes and PhyloBayes) and bootstrap support from Maximum-likelihood analysis (PhyML and RAXML). Support values for other nodes are denoted by symbols (see inset). DOI:http://dx.doi.org/10.7554/eLife.02866.028
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item-115 at level 2: caption: Figure 4—figure supplement 9. Phylogenetic analysis of TTRAY1, TTRAY2, α-COP, and β′-COP. TTRAYs 1 and 2, and COPI α and β′, arose from separate gene duplications, indicating that the ancestral complex had only one such protein, although possibly present as two identical copies. Phylogenetic analysis of α- and β′-COPI (red), and TTRAYs 1 and 2 (yellow), shows a well supported COPI clade excluding all of the TTRAY1 and 2 sequences, suggesting that the duplications giving rise to these proteins occurred independently, and the utilization of two different outer coat members occurred through convergent evolution. Node support for critical nodes is shown. Numbers indicate Bayesian posterior probabilities (MrBayes) and bootstrap support from Maximum-likelihood analysis (RAxML). Support values for other nodes are denoted by symbols (see inset). DOI:http://dx.doi.org/10.7554/eLife.02866.029
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item-117 at level 2: caption: Figure 4—figure supplement 10. Muniscin family members identified by reverse HHpred, using the following PDB structures. 2V0O_A (Chain A, Fcho2 F-Bar Domain); 3 G9H_A (Chain A, Crystal Structure Of The C-Terminal Mu Homology Domain Of Syp1); 3G9G_A (Chain A, Crystal Structure Of The N-Terminal EfcF-Bar Domain Of Syp1). DOI:http://dx.doi.org/10.7554/eLife.02866.030
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