New Insights into α-GalNAc−Ser Motif: Influence of ... - ACS Publications

The α-O-glycosidic linkage between N-acetylated 2-amino-2-deoxy-d-galactose (GalNAc) and the hydroxyl group of l-serine (Ser) or l-threonine (Thr) ha...
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S1

Supporting Information for

“New Insights into α-GalNAc-Ser Motif: Influence of Hydrogen Bonding versus Solvent Interactions on the Preferred Conformation”

submitted to The Journal of the American Chemical Society by: Francisco Corzana, Jesús H. Busto, Gonzalo Jiménez-Osés, Juan L. Asensio, Jesús J. Barbero, Jesús M. Peregrina, * and Alberto Avenoza*

1

H and

13

1

C NMR spectra for compounds 1, 2, 3, 5α, and 6α ( H for 1 in natural abundance), and COSY

and HSQC correlations for compounds 1, 5α, and 6α. S2-S10 NOE data for 1 in natural abundance. S11 Comparison of the most relevant dihedral angles obtained from the unrestrained MD (MDH2O) and the MD-tar (MDH2O-tar) in explicit water simulations for compound 1. S12 B3LYP/6-31G(d) distances, dihedral angles, energy, enthalpy, free energy, entropy and coordinates of the optimized structure of 1 together with water molecules. S13-S18 1D-Selective HMQC-type experiments. S19 MPEG movie of the MD-tar trajectory (5 ps) in explicit water showing one bridging water molecule. S20

S2

1

H and 13C NMR spectra for compounds 1, 2, 3, 5α and 6α, and COSY and HSQC

correlations for compounds 1, 5α and 6α

H2s

O H1s Me3

15

O

H2O Me1

N

H3

N



HβproS + H3s + H5s Hα

HβproR H2s

H4s

O

2H6s

Figure S1. 1H and 13C NMR (D2O) spectra for 1.

H6s H3s H5s HβproR

H4s H6s

HβproS

O

H1s

O

N

13C

H1

OH OH OH

H2

Me2

1

Me1

Me2

Me3

S3

(D2O, 400 MHz)

H2s

O H1s Me3

H2O Me1

H3s + H5s HβproS

O

N O

H3

O

C

N H1

H3s H6s H5s HβproR

H4s H6s

HβproS H2

N

Hα O

HβproR

OH OH OH

Me1

Me2

Me2

1

H1s Hα

H4s H2s

2H6s

(H2O/D2O, 500 MHz)

Figure S2. 1H (D2O, 400 MHz) and (H2O/D2O, 500 MHz) spectra for 1 in natural abundance.

Me3

S4

OH OH O HO 15 NHAc

13

O

CONHMe NHAc

1

Figure S3. COSY and HSQC correlations for 1.

S5

HO 13

CONHMe

NHBoc 2

Figure S4. 1H and 13C NMR spectra for 2.

S6

OH 13

CONHMe

NHAc 3

Figure S5. 1H and 13C NMR spectra for 3.

S7

BnO OBn O BnO 15

NO2

13

O 5α

Figure S6. 1H and 13C NMR spectra for 5α.

CONHMe NHAc

S8

BnO OBn O BnO 15

NO2

13

O 5α

CONHMe NHAc

Figure S7. COSY and HSQC correlations for 5α.

S9

BnO OBn O BnO 15 NHAc

13

O

CONHMe NHAc



Figure S8. 1H and 13C NMR spectra for 6α.

S10

BnO OBn O BnO 15 NHAc

13

O

CONHMe NHAc



Figure S9. COSY and HSQC correlations for 6α.

S11

Figure S10. Selective ge-1D NOESY for Me3 in compound 1 (natural abundance). H1s-Hα H1s-H2s H1s-HβproR H1s-HβproS

6

5

NOE %

4

3

2

1

0 0

400

800

1200

1600

mixing time ms

Figure S11. NOE build-up curves for compound 1 in natural abundance.

S12

MDH2O

MDH2O-tar

Figure S12. Comparison of the Φp/Ψp, Φs/Ψs and χ1 distributions obtained from the 40 ns unrestrained MD (MDH2O) and 4 ns MDH2O-tar simulations for 1.

S13

1_gg_13_wat

1_ gt_15_wat

1_gg_12_wat

1_gg

1_gg_11_wat

1_ gg_1_wat

Figure S13. B3LYP/6-31G(d) geometries of different structures studied in this work. Minimizations of compound 1 include surrounding water molecules for the two major conformers of the hydroxymethyl group experimentally detected (gg and gt). As can be seen in these plots and in Table S1, the geometry of the solute significantly changes when decreasing the number of solvating water molecules. When the bridging water molecule is removed (1_gg_11_wat and 1_gg), the carbohydrate and peptide moieties tend to form an intramolecular hydrogen bond, which is not experimentally observed.

S14 Table S1. Some geometrical values for the optimized geometries obtained at B3LYP/6-31G(d) level.a

a

Φp

Ψp

χ1p

N3−O1

H3−O1

N3−H3−O1

H2s−C2s−N3−H3

1_gg_13_wat

−141.6

156.8

56.5

4.90

4.06

32.1

−174.3

1_gg_12_wat

−149.8

153.6

48.6

4.44

3.72

40.1

−178.1

1_gg_11_wat

−170.9

164.5

64.6

3.63

2.79

30.1

−165.9

1_gg_1_wat

−95.4

146.3

50.6

4.14

3.53

46.9

−172.9

1_gg

−152.0

153.1

62.1

3.18

2.23

17.2

−167.0

1_gt_15_wat

−161.8

173.5

70.0

4.52

3.71

34.1

−175.8

Distances are given in Å and angles in degrees.

Table S2. B3LYP/6-31G(d) energies, enthalpies, free energies, and entropies of the structures considered in this work.

1_gg_13_wat

E (Hartree)a -2308.23459022

H (Hartree)b -2307.421368

S (cal·mol–1 K–1)b 324.7

G (Hartree)b -2307.575652

Lowest freq. (cm–1) 14.5

1_gg_12_wat

-2231.80855456

-2231.023282

309.7

-2231.170416

16.6

1_gg_11_wat

-2155.37147238

-2154.615027

303.5

-2154.759247

14.3

1_gg_1_wat

-1391.03621528

-1390.561679

204.0

-1390.658600

15.1

1_gg

-1314.60292189

-1314.156883

191.2

-1314.247728

18.6

1_gt_15_wat

-2461.09599094

-2460.226211

347.084

-2460.391122

15.3

1 Hartree = 627.5 Kcal·mol–1. bThermal corrections at 298.15 K.

a

S15 Coordinates of optimized structures Structure 1_gg_13_wat (B3LYP/6-31G(d)) O C C H H H N H C C O N C H H H H H C H H O C H O C C O H H H H C O H H C O H H C H N H C C H H H O O H H O H H O H H O H H O H H O H H O H H

4.56904938 3.71004938 3.71304938 4.63704938 3.72604938 2.85704938 2.75804938 2.08504938 2.64004938 2.25804938 1.65904938 2.60804938 2.28604938 1.60104938 3.19804938 1.81204938 3.12104938 3.62304938 1.70104938 1.62504938 2.14704938 0.40904938 -0.52095062 -0.66595062 -0.02495062 0.23204938 0.94704938 2.21204938 2.09104938 0.31404938 1.14404938 0.92904938 -1.05995062 -1.95695062 -1.96495062 -0.78995062 -1.70495062 -2.94395062 -3.39095062 -1.03695062 -1.85795062 -2.55095062 -2.41295062 -1.85395062 -3.63795062 -4.09895062 -3.26695062 -4.73195062 -4.69995062 -4.39595062 -6.36095062 -5.91695062 -6.09395062 -2.00895062 -1.31495062 -2.86795062 2.92304938 3.22204938 3.71804938 -4.37495062 -4.34395062 -4.63695062 -4.88195062 -4.79995062 -4.07195062 5.05804938 4.83404938 5.22904938 5.34504938 5.19804938 6.28704938

0.11806481 0.75106481 0.72506481 1.19306481 -0.31693519 1.24606481 1.49306481 1.98306481 1.59106481 3.01106481 3.81306481 3.28606481 4.54306481 4.37306481 5.01306481 5.20406481 2.56706481 1.36906481 0.52806481 0.66006481 -0.45293519 0.60706481 -0.24093519 0.10506481 -1.55793519 -2.22393519 -3.51693519 -3.24693519 -2.72293519 -4.11993519 -4.09793519 -1.60393519 -2.37393519 -3.32993519 -3.32993519 -2.71993519 -0.97093519 -1.16993519 -0.31693519 -0.36893519 -0.25193519 -0.83293519 1.08606481 1.81406481 1.43506481 2.83806481 3.50906481 2.77806481 3.20706481 0.64106481 -0.28393519 0.07206481 -1.22893519 -3.34793519 -2.68093519 -2.86493519 -1.59193519 -2.21093519 -1.46393519 -2.03293519 -1.06393519 -2.34793519 -2.63393519 -3.58393519 -2.23893519 -1.05393519 -0.56193519 -1.97993519 -2.29493519 -1.38893519 -2.32593519

1.24499691 1.89299691 3.40499691 3.76299691 3.73899691 3.84099691 1.29999691 1.88499691 -0.14400309 -0.58600309 0.15799691 -1.84900309 -2.51000309 -3.34800309 -2.89100309 -1.78500309 -2.37500309 -0.56300309 -0.72900309 -1.81400309 -0.54700309 -0.12800309 -0.78200309 -1.81500309 -0.90700309 0.35699691 -0.01500309 -0.61500309 -1.43500309 -0.67700309 0.88999691 0.93599691 1.16699691 0.65199691 -0.34400309 2.17399691 1.34199691 1.99099691 2.23899691 1.97799691 -0.02000309 -0.63000309 0.10799691 0.57899691 -0.32600309 -0.00800309 0.21399691 0.88499691 -0.84200309 -0.93700309 0.95499691 0.15899691 0.95199691 -2.06300309 -2.19700309 -2.19700309 -2.84600309 -3.53200309 -2.25100309 -1.95200309 -1.83300309 -1.05700309 0.74299691 0.91499691 1.16099691 -1.31400309 -0.49800309 -0.96600309 2.36799691 2.01299691 2.59299691

O H H O H H O H H O H H O H H O H H

-4.62095062 -4.90695062 -5.36095062 5.01504938 5.13504938 4.04604938 1.20204938 1.49004938 1.48904938 -1.05295062 -0.31495062 -0.60095062 4.00104938 4.77004938 3.44004938 -5.96495062 -5.48395062 -6.86295062

0.82906481 0.72206481 0.44106481 -3.45793519 -3.20693519 -3.57693519 3.48206481 3.87106481 4.09706481 3.36206481 3.52606481 3.35006481 1.04606481 0.63506481 0.26306481 2.30406481 1.62206481 2.26406481

2.66899691 3.58799691 2.11699691 -0.16200309 0.78299691 -0.25700309 2.83299691 1.97599691 3.52399691 1.14299691 0.52799691 2.00799691 -3.12100309 -2.68400309 -3.30500309 -2.73400309 -2.22600309 -2.37100309

Structure 1_gg_12_wat (B3LYP/6-31G(d)) O C C H H H N H C C O N C H H H H H C H H O C H O C C O H H H H C O H H C O H H C H N H C C H H H O O H

4.24197771 3.24697771 2.93997771 3.70297771 3.00697771 1.95497771 2.41997771 1.54597771 2.54197771 2.07897771 1.23297771 2.65897771 2.31497771 2.18597771 3.10097771 1.38497771 3.35697771 3.59597771 1.78897771 1.74197771 2.33297771 0.48397771 -0.42502229 -0.58102229 0.07597771 0.30897771 1.01097771 2.33297771 2.31897771 0.41197771 1.10797771 1.00397771 -0.99902229 -1.91102229 -1.93302229 -0.75002229 -1.60802229 -2.85202229 -3.25402229 -0.92302229 -1.74802229 -2.49602229 -2.19502229 -1.57902229 -3.37202229 -3.68702229 -2.78302229 -4.29102229 -4.27202229 -4.19602229 -6.18002229 -5.73502229

0.30698089 0.86798089 0.70598089 1.23398089 -0.35601911 1.09198089 1.65398089 1.96698089 1.78998089 3.17798089 3.85098089 3.56998089 4.81398089 4.63398089 5.56698089 5.19498089 2.94998089 1.68198089 0.66298089 0.86398089 -0.27601911 0.56298089 -0.15901911 0.36298089 -1.42801911 -2.32901911 -3.54301911 -3.23101911 -2.51101911 -3.95301911 -4.31801911 -1.84401911 -2.61901911 -3.42101911 -3.18601911 -3.17901911 -1.27101911 -1.56001911 -0.76001911 -0.82801911 -0.28101911 -0.67101911 1.02998089 1.54298089 1.59098089 2.91298089 3.43898089 2.70198089 3.52598089 1.05098089 -0.24601911 0.26698089

1.76997134 2.27697134 3.74997134 4.33197134 4.00497134 4.02397134 1.56797134 1.99097134 0.12397134 -0.34602866 0.26497134 -1.49202866 -2.16302866 -3.23402866 -2.02602866 -1.74102866 -1.92002866 -0.13202866 -0.60102866 -1.67702866 -0.46002866 -0.04202866 -0.83902866 -1.79302866 -1.20202866 -0.08802866 -0.68402866 -1.11402866 -1.77902866 -1.50602866 0.08197134 0.60997134 0.65797134 -0.05502866 -1.02302866 1.56997134 1.12197134 1.72997134 2.16097134 1.86097134 -0.05902866 -0.75102866 0.38897134 1.02697134 0.06497134 0.72597134 1.04097134 1.61697134 0.03497134 -0.71302866 0.94497134 0.24097134

S16 H O H H O H H O H H O H H O H H O H H O H H O H H O H H O H H O H H

-5.96102229 -2.01102229 -1.25902229 -2.82202229 3.35597771 3.83497771 3.99497771 -4.28702229 -4.22702229 -4.57302229 -4.84402229 -4.84702229 -4.01802229 5.12197771 4.79597771 5.23597771 4.61897771 4.62797771 5.46697771 -4.39102229 -4.68602229 -5.15002229 4.90697771 4.76897771 4.00797771 -0.35102229 0.10697771 -0.63502229 4.42397771 5.09297771 3.90997771 -5.60402229 -5.19802229 -6.51602229

-1.17601911 -2.80701911 -2.19401911 -2.23501911 -1.14001911 -1.67401911 -1.04001911 -1.36601911 -0.44801911 -1.86501911 -2.56801911 -3.53501911 -2.34901911 -0.69001911 -0.24601911 -1.64301911 -2.25301911 -1.30801911 -2.39201911 0.36698089 0.07198089 0.15298089 -3.18901911 -3.02001911 -3.34901911 2.65198089 3.18398089 3.29598089 1.52198089 1.06898089 0.76498089 3.26998089 2.42498089 3.19698089

0.71697134 -2.70102866 -2.71002866 -2.72402866 -2.76702866 -3.42102866 -2.00402866 -2.29502866 -1.96702866 -1.49502866 0.17697134 0.11897134 0.68597134 -0.77902866 0.03097134 -0.48002866 2.74397134 2.46897134 3.19197134 2.84397134 3.71897134 2.22697134 0.11397134 1.07397134 -0.24502866 2.08097134 1.37797134 2.74697134 -2.60602866 -2.06002866 -2.95502866 -1.95102866 -1.67802866 -1.63302866

Structure 1_gg_11_wat (B3LYP/6-31G(d)) O C C H H H N H C C O N C H H H H H C H H O C H O C C O H H H H C O H H C O H H

4.51297368 3.63497368 3.67997368 4.59897368 3.72697368 2.82097368 2.61897368 1.90197368 2.39097368 1.27897368 0.55697368 1.16897368 0.14297368 -0.62102632 0.59497368 -0.33102632 1.81297368 3.31197368 1.95997368 1.89897368 2.69997368 0.69197368 -0.21402632 -0.34102632 0.25897368 0.49597368 1.18997368 2.48197368 2.40897368 0.56497368 1.34397368 1.20297368 -0.80902632 -1.74002632 -1.78802632 -0.55702632 -1.40002632 -2.63502632 -2.99702632 -0.69702632

0.97302961 1.63302961 1.79702961 2.32602961 0.80002961 2.33902961 2.22102961 2.75302961 2.09302961 3.09602961 3.57502961 3.34502961 4.21902961 3.64702961 4.93702961 4.75702961 2.87202961 2.32402961 0.67502961 0.60002961 -0.05197039 0.38902961 -0.24897039 0.34302961 -1.50097039 -2.44497039 -3.62497039 -3.25697039 -2.47497039 -4.01897039 -4.42497039 -1.98897039 -2.74597039 -3.51397039 -3.23397039 -3.33597039 -1.40397039 -1.69397039 -0.90197039 -0.99297039

1.50496711 2.09896711 3.60296711 3.87596711 4.05396711 4.00596711 1.44996711 1.93596711 0.02196711 -0.34703289 0.53596711 -1.66403289 -2.21403289 -2.75403289 -2.90603289 -1.39303289 -2.30703289 -0.52503289 -0.37203289 -1.45703289 -0.02803289 0.21896711 -0.65003289 -1.56603289 -1.08303289 -0.00703289 -0.67203289 -1.15203289 -1.73903289 -1.48303289 0.05796711 0.69796711 0.74596711 0.02096711 -0.93303289 1.63696711 1.26296711 1.88496711 2.36696711 2.00196711

C H N H C C H H H O O H H O H H O H H O H H O H H O H H O H H O H H O H H O H H O H H

-1.54202632 -2.30302632 -1.93702632 -1.21802632 -3.10002632 -3.26702632 -2.31002632 -3.69302632 -3.96002632 -4.00502632 -5.93402632 -5.51802632 -5.74202632 -1.91402632 -1.15102632 -2.71502632 3.33997368 3.78997368 4.05597368 -4.16502632 -4.10002632 -4.44502632 -4.69502632 -4.74802632 -3.84702632 5.19797368 4.99497368 5.21197368 4.71297368 4.81897368 5.58897368 -4.00802632 -4.26402632 -4.81702632 4.87097368 4.67597368 4.01297368 3.05397368 3.98097368 3.09597368 -5.47402632 -5.07002632 -6.35602632

-0.37997039 -0.73297039 0.94402961 1.47902961 1.56802961 2.93902961 3.46302961 2.80702961 3.52002961 1.03802961 -0.27097039 0.25802961 -1.19597039 -2.76997039 -2.17097039 -2.18597039 -0.91197039 -1.41597039 -0.72597039 -1.32097039 -0.41697039 -1.84997039 -2.58897039 -3.55497039 -2.41397039 -0.44897039 0.18802961 -1.33497039 -1.48097039 -0.59897039 -1.69197039 0.29602961 0.06202961 0.10402961 -2.78297039 -2.48697039 -3.05397039 1.81602961 2.09502961 0.83002961 3.26702961 2.41802961 3.23302961

0.11096711 -0.58603289 0.57496711 1.04996711 0.30296711 0.91496711 1.00696711 1.91796711 0.30296711 -0.38103289 1.31896711 0.61096711 1.04796711 -2.58903289 -2.60403289 -2.56703289 -2.79703289 -3.49403289 -2.10903289 -2.06403289 -1.70203289 -1.28103289 0.37396711 0.30596711 0.86196711 -0.96903289 -0.25803289 -0.50203289 2.78196711 2.35696711 3.13796711 3.09196711 3.99696711 2.53296711 0.29996711 1.21696711 -0.09403289 -3.32803289 -3.35503289 -3.27803289 -1.54003289 -1.27803289 -1.13903289

Structure 1_gg_1_wat (B3LYP/6-31G(d)) O C C H H H N H C C O N C H H H H H C H H O C H O C C O H H H

4.34395588 3.41295588 3.28995588 4.27495588 2.97095588 2.57295588 2.37895588 1.72795588 2.42495588 2.96595588 2.72795588 3.69395588 4.28295588 4.22495588 5.33195588 3.71795588 3.97595588 3.11795588 1.04695588 1.05795588 0.80295588 0.08895588 -1.14504412 -0.98904412 -1.78204412 -2.08204412 -2.50804412 -1.48404412 -1.31304412 -3.45404412 -2.67404412

-2.11200000 -1.58300000 -1.62000000 -1.43700000 -2.62200000 -0.89000000 -0.95600000 -0.38000000 -0.75800000 0.64300000 1.65200000 0.69600000 1.92700000 1.94200000 2.02700000 2.76600000 -0.17700000 -1.51200000 -0.99800000 -0.69700000 -2.06700000 -0.23600000 -0.04100000 0.45000000 -1.27300000 -2.08500000 -3.44100000 -3.99700000 -3.33400000 -3.33900000 -4.13800000

1.00407353 1.60207353 3.11607353 3.55307353 3.42507353 3.50407353 0.95307353 1.48007353 -0.47792647 -0.83492647 -0.16292647 -1.97592647 -2.48392647 -3.57592647 -2.17792647 -2.07692647 -2.40092647 -0.86492647 -1.11292647 -2.17092647 -1.06092647 -0.38892647 -1.03592647 -2.00592647 -1.35592647 -0.19392647 -0.74592647 -1.55692647 -2.24592647 -1.29792647 0.08107353

S17 H C O H H C O H H C H N H C C H H H O O H H

-1.16604412 -3.12004412 -4.34104412 -4.09004412 -3.39104412 -2.55804412 -3.53804412 -4.35404412 -1.72804412 -2.03804412 -2.89604412 -1.37404412 -0.60504412 -1.85204412 -1.11204412 -0.20904412 -1.78604412 -0.84604412 -2.80204412 1.00995588 1.63295588 1.36095588

-2.21800000 -1.34500000 -1.14700000 -0.90000000 -1.93000000 0.01700000 0.74000000 0.66200000 -0.15000000 0.82200000 1.13900000 2.03700000 1.96000000 3.26600000 4.44200000 4.14100000 4.95700000 5.15200000 3.42600000 1.55800000 1.68400000 2.10800000

0.39507353 0.64607353 -0.07592647 -0.98192647 1.53207353 1.09707353 1.81207353 1.28507353 1.79307353 -0.12192647 -0.72392647 0.28107353 0.94807353 -0.07492647 0.54607353 1.08607353 1.23807353 -0.24192647 -0.83692647 1.96807353 1.21007353 2.68407353

Structure 1_gg (B3LYP/6-31G(d)) O C C H H H N H C C O N C H H H H H C H H O C H O C C O H H H H C O H H C O H H C H N H C C H H H O

3.73903608 3.40303608 3.57803608 4.63003608 2.99603608 3.26803608 2.84403608 2.57903608 2.64703608 2.69303608 2.35703608 3.09103608 3.14703608 2.35303608 4.11803608 3.01903608 3.39203608 3.45103608 1.30903608 1.21403608 1.28903608 0.25603608 -0.92196392 -0.68196392 -1.74396392 -2.19096392 -2.91096392 -2.04996392 -1.69496392 -3.81396392 -3.22696392 -1.31096392 -3.04396392 -4.23296392 -3.98396392 -3.38596392 -2.22296392 -2.99296392 -3.79696392 -1.39096392 -1.65296392 -2.49196392 -0.79596392 0.13803608 -1.25596392 -0.27096392 0.75603608 -0.58196392 -0.31396392 -2.37496392

-2.96396907 -2.19696907 -2.53696907 -2.77496907 -3.43596907 -1.73396907 -0.97896907 -0.33296907 -0.51696907 1.02003093 1.66103093 1.59503093 3.03503093 3.37603093 3.32003093 3.51403093 0.99303093 -0.93496907 -1.00596907 -0.67796907 -2.10096907 -0.46296907 -0.07396907 0.40903093 -1.17796907 -1.95696907 -3.16496907 -3.91496907 -3.28096907 -2.83196907 -3.82996907 -2.30596907 -1.06396907 -0.61696907 -0.40896907 -1.62496907 0.15203093 1.00103093 1.21303093 -0.19796907 0.90003093 1.33503093 2.00903093 1.80403093 3.29903093 4.32703093 3.95103093 4.62203093 5.21903093 3.60503093

0.22702577 1.12402577 2.59502577 2.77902577 2.82102577 3.27002577 0.86202577 1.59302577 -0.49397423 -0.47997423 0.51802577 -1.64097423 -1.84297423 -2.51697423 -2.26097423 -0.87197423 -2.39397423 -1.11097423 -1.08597423 -2.13197423 -1.05997423 -0.29897423 -0.95897423 -1.91597423 -1.30597423 -0.16597423 -0.75697423 -1.59697423 -2.24197423 -1.28997423 0.05202577 0.38802577 0.73502577 0.07402577 -0.84297423 1.61202577 1.20902577 2.03002577 1.52302577 1.83102577 -0.02197423 -0.57297423 0.32702577 0.66802577 0.32502577 0.85802577 0.90502577 1.86702577 0.22702577 -0.07197423

Structure 1_gt_15_wat (B3LYP/6-31G(d)) O C C H H H N H C C O N C H H H H H C H H O C H O C C O H H H H C O H H C O H H C H N H C C H H H O O H H O H H O H H O H H O H H O H H O H H O H H O

-4.82100581 -4.76000581 -5.20000581 -4.35200581 -5.54500581 -5.99100581 -4.25800581 -4.32600581 -3.87800581 -3.79500581 -3.92500581 -3.58700581 -3.47100581 -4.25600581 -2.50000581 -3.57800581 -3.39000581 -4.65500581 -2.57600581 -2.48500581 -2.61900581 -1.43300581 -0.30200581 -0.50400581 0.03399419 0.38399419 0.69799419 1.54099419 2.50299419 1.11599419 -0.25000581 -0.49000581 1.53699419 2.77999419 2.79699419 1.62899419 1.31899419 2.50799419 3.26199419 0.54299419 0.87699419 1.70499419 0.56699419 -0.23900581 1.32399419 0.96199419 1.80999419 0.84199419 0.06199419 2.31799419 4.34399419 3.85399419 3.67899419 -1.58200581 -2.42700581 -1.74800581 -6.79100581 -6.14100581 -6.28500581 0.64099419 1.02299419 1.12099419 5.47099419 5.73699419 4.49099419 3.26599419 3.03499419 3.27299419 3.62499419 4.17499419 3.19899419 -2.75300581 -3.55800581 -2.73900581 -1.92000581

-2.04797674 -1.13297674 -1.32897674 -1.70897674 -0.39997674 -2.08297674 0.08402326 0.86602326 0.44302326 1.97502326 2.67102326 2.48302326 3.91902326 4.44202326 4.30102326 4.12202326 1.86702326 0.08402326 -0.20197674 -0.00497674 -1.28097674 0.34302326 0.36602326 0.94602326 -0.92297674 -1.91097674 -3.21097674 -3.06197674 -2.99997674 -3.93797674 -3.61297674 -2.10897674 -1.41597674 -1.50897674 -0.98197674 -2.08597674 0.02102326 0.49502326 0.43502326 -0.00097674 0.96702326 1.06502326 2.30302326 2.42602326 3.37602326 4.67302326 4.96402326 5.45502326 4.59602326 3.33602326 3.07002326 3.36002326 2.53502326 3.04702326 3.01702326 2.50302326 -3.89197674 -3.35797674 -4.67797674 -1.69297674 -2.11897674 -2.08597674 -1.83797674 -2.17997674 -1.89297674 -1.43497674 -0.69297674 -1.03997674 0.00602326 0.44402326 0.73802326 -3.51197674 -3.15797674 -3.13097674 -1.82597674

-0.97000291 -1.80800291 -3.24500291 -3.83000291 -3.70800291 -3.26800291 -1.49500291 -2.13700291 -0.14100291 -0.05600291 -1.08300291 1.16299709 1.37099709 0.81799709 1.03199709 2.43899709 1.96799709 0.54699709 0.32799709 1.39699709 0.17299709 -0.35200291 0.48799709 1.39599709 0.98399709 -0.00900291 0.75799709 1.88999709 1.66199709 0.04799709 1.12199709 -0.64400291 -0.88700291 -0.21100291 0.62699709 -1.74900291 -1.42500291 -2.06100291 -1.40700291 -2.19600291 -0.29200291 0.41199709 -0.77700291 -1.40900291 -0.50000291 -1.19100291 -1.82100291 -0.43500291 -1.80300291 0.26599709 -1.77300291 -0.97600291 -2.24000291 -2.51700291 -2.01300291 -3.30100291 -1.95300291 -1.45400291 -2.21200291 4.05199709 3.23699709 4.79499709 -0.62700291 -1.51800291 -0.64300291 -3.90500291 -3.29400291 -4.79000291 1.86699709 1.17299709 2.36499709 0.77899709 0.36299709 1.67799709 3.01899709

S18 H H O H H O H H O H H O H H O H H O H H

-1.24000581 -1.35000581 4.72699419 5.04199419 5.30199419 4.28899419 4.88899419 4.22899419 0.01299419 0.31799419 0.76999419 -2.71300581 -2.69900581 -1.77000581 5.70099419 4.84499419 5.57199419 2.35399419 2.32199419 2.83399419

-2.00397674 -1.54497674 0.71702326 1.52902326 -0.07397674 -2.72997674 -2.73197674 -1.77997674 1.07502326 0.14402326 1.57602326 0.95202326 -0.02897674 1.17102326 -2.56397674 -2.15597674 -3.51497674 2.29802326 2.72902326 2.91302326

3.70299709 2.27599709 -0.48600291 -0.94300291 -0.66100291 1.99999709 1.23099709 2.22799709 3.88799709 3.95699709 3.52699709 3.44299709 3.46199709 3.63499709 -3.24900291 -3.53100291 -3.38000291 2.78199709 1.88899709 3.35699709

Ac

2

N H

C2s

JH-CO

C

NHMe



Figure S14. 1D-Selective HMQC-type experiments with the period of evolution of coupling (1/2J) chosen to match J values of 1, 2, 3, 4 and 5 Hz.

O

13

S19

MPEG movie of the MD-tar trajectory (5 ps) in explicit water showing one bridging water molecule

S20

Challacombe, P. M. W. Gill, B. Johnson, W. Chen, M. W. Wong, C. Gonzalez, and J. A. Pople, Gaussian, Inc., Wallingford CT, 2004.

B. Stefanov, G. Liu, A. Liashenko, P. Piskorz, I. Komaromi, R. L. Martin, D. J. Fox, T. Keith, M. A. Al-Laham, C. Y. Peng, A. Nanayakkara, M.

C. Strain, O. Farkas, D. K. Malick, A. D. Rabuck, K. Raghavachari, J. B. Foresman, J. V. Ortiz, Q. Cui, A. G. Baboul, S. Clifford, J. Cioslowski, B.

Pomelli, J. W. Ochterski, P. Y. Ayala, K. Morokuma, G. A. Voth, P. Salvador, J. J. Dannenberg, V. G. Zakrzewski, S. Dapprich, A. D. Daniels, M.

X. Li, J. E. Knox, H. P. Hratchian, J. B. Cross, C. Adamo, J. Jaramillo, R. Gomperts, R. E. Stratmann, O. Yazyev, A. J. Austin, R. Cammi, C.

Petersson, H. Nakatsuji, M. Hada, M. Ehara, K. Toyota, R. Fukuda, J. Hasegawa, M. Ishida, T. Nakajima, Y. Honda, O. Kitao, H. Nakai, M. Klene,

Vreven, K. N. Kudin, J. C. Burant, J. M. Millam, S. S. Iyengar, J. Tomasi, V. Barone, B. Mennucci, M. Cossi, G. Scalmani, N. Rega, G. A.

Gaussian 03, Revision C.01, M. J. Frisch, G. W. Trucks, H. B. Schlegel, G. E. Scuseria, M. A. Robb, J. R. Cheeseman, J. A. Montgomery, Jr., T.

Reference 30

Kollman, P.A. (1999), AMBER 6, University of California, San Francisco.

Cheng, A. L.; Vincent, J. J.; Crowley, M.; Tsui, V.; Radmer, R. J.; Duan, Y.; Pitera, J.; Massova, I.; Seibel, G. L.; Singh, U. C.; Weiner, P. K.;

Case, D. A.; Pearlman, D. A.; Caldwell, J. W.; Cheatham, T. E., III; Ross, W. S.; Simmerling, C. L.; Darden, T. A.; Merz, K. M.; Stanton, R. V.;

Reference 16b

Complete references 16b and 30.

S21