1. Lipid Lateral Organization on Giant Unilamellar Vesicles Containing Lipopolysaccharides 
Jakubs Kubiak, Jonathan Brewer, Søren Hansen, Luis A. Bagatolli 
Biophysical Journal 
Volume 100, Issue 4, Pages (February 2011)
DOI: /j.bpj
Copyright © 2011 Biophysical Society Terms and Conditions

2. Figure 1
Molecular structure of LPS-Re of E. coli (left). Schematic representation of the different LPSs used in this work (right). Gal, galactopyranose; Glc, glucopyranose; GlcN, 2-amino-2-deoxyglucopyranose; Hep, L-glycero-α-D-manno-heptopyranose; Kdo, 3-deoxy-α-D-manno-oct-2-ulopyranosonic acid; P, phosphate. For more details, see Caroff and Karibian (2).
Biophysical Journal  , DOI: ( /j.bpj )
Copyright © 2011 Biophysical Society Terms and Conditions

3. Figure 2
Summary of the LPS incorporation procedure for four studied LPS strains. The x axis represents the starting LPS concentration as a fraction of the total amount of lipids in the sample. The y axis shows the concentration of LPS in the oligolamellar vesicles as a fraction of the total amount of lipids in the samples after completion of the purification procedure. The solid black line indicates an ideal 100% incorporation efficiency. These vesicles were used to form GUVs. The efficiency of LPS incorporation increases as the length of the polysaccharide decreases. Error bars are standard deviations.
Biophysical Journal  , DOI: ( /j.bpj )
Copyright © 2011 Biophysical Society Terms and Conditions

4. Figure 3
Representative images of GUVs (false color representation) composed of E. coli polar lipid extract and LPSs: (A) LPS-smooth, (B) LPS-Ra, (C) LPS-Rc (above 10 mol %), (D) LPS-Rd (above 10 mol %), and (E) lipid A (above 5 mol %). The upper row shows fluorescence images (false color representation) of GUVs labeled with rhodamine-DHPE. The bottom row displays Laurdan GP images of the GUVs. For LPS-smooth (A) and LPS-Ra (B), no visible phase separation can be seen in the GUVs at any of the explored concentrations (up to 15 mol %). For deep rough LPS strains (Rc (C) and Rd (D)), the coexistence of domains of high GP values (close to 0.6 indicating presence of a gel-like structure) is observed above 10 mol %. Scale bars are 10 μm.
Biophysical Journal  , DOI: ( /j.bpj )
Copyright © 2011 Biophysical Society Terms and Conditions

5. Figure 4
Laurdan GP values of LPSs containing membranes as a function of LPS concentration: (A) LPS-smooth, (B) LPS-Ra, (C) LPS-Rc, (D) LPS-Rd, and (E) lipid A. (○ and ●) Laurdan GP values calculated from GUVs. Double points at high LPS concentration for C–E represent visible phase separation GUVs. These Laurdan GP values were calculated separately for each domain, liquid-like (○) and gel-like (●). Each point represents an average of 15–25 separate vesicles; error bars are standard deviations. (Δ) Laurdan GP values from the oligolamellar vesicles used to form GUVs (measured in a fluorometer in the concentration range where domains are not observed in the GUVs).
Biophysical Journal  , DOI: ( /j.bpj )
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6. Figure 5
FCS experiments performed in GUVs containing LPS-smooth and LPS-Ra, respectively, doped with fluorescently labeled Alexa 488 LPS-smooth (0.001 mol % with respect to total lipids). The figure shows the corresponding LPS diffusion coefficient measured in GUVs (each point is an average of 15–20 separate vesicles; error bars are standard deviations). No microscopic phase separation was seen in these samples with either Laurdan GP or rhodamine-DHPE.
Biophysical Journal  , DOI: ( /j.bpj )
Copyright © 2011 Biophysical Society Terms and Conditions

7. Figure 6
Sketch representing the different LPS-rich domain sizes observed in our experiments. LPS chemotypes (A: LPS-smooth and LPS-Ra; B: Rc and Rd2 (deep rough chemotypes of LPS)) are inserted into the lipid membrane (PE and PG, cardiolipin not shown). (A) The lateral organization of LPS-smooth (valid also for LPS-Ra) is represented for a low concentration of this lipid (the LPS domains in the sketch correspond to a diffusion twofold lower than that of the single LPS and are nanoscopic; see section 3 of the Supporting Material). (B) Formation of large membrane platforms (micrometer-sized) for the rough LPS chemotypes above 10 mol % LPS concentration.
Biophysical Journal  , DOI: ( /j.bpj )
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