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$B!J(B8$B!KAjE>0\$rMxMQ$7$?(BDNA$B!=J,;R$NA`:n(B

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$B!!I.0\$rMQ$$$FB;=}$J$/M"Aw$7!$5U$NAjE>0\$rMQ$$$F4pHD>e$KD>@~>u$K?-D9$5$;$k$J$I!$7ABV$d0LCV$r@)8f$9$k5;=Q3+H/$r@EEE5$NO$H%l!<%6!<%H%i%C%T%s%0$rMQ$$$F?J$a$F$$$k!#$^$?!$?-D%8GDj$7$?(BDNA1$BJ,;R$K7V8w?'AG%i%Y%k$7$?@)8B9ZAG$r7k9g$5$;@)8B9ZAGCO?^$r:n@.$9$k$3$H!$%l!<%6!<$J$I$rMQ$$$F6I=jE*$K@ZCG$7!$CGJR$r2s<}$7(BPCR$BA}I}$9$k$J$I$N!$(B1$BJ,;R$rBP>]$H$9$k2C9)$*$h$SH?1~A`:n5;=Q$N3+H/$r9T$C$F$$$k!#L}Cf$KD>7B(B10$B%_%/%m%sDxEY$N1UE)$r:n$j!$$3$N1UE)$K(BDNA$BJ,;R$NCGJR$d(BPCR$B$KI,MW$J9ZAG$J$I$rF~$l$k$3$H$G!$6K$a$F>.$5$$H?1~BN@Q$G2=3XH?1~$r9T$&7O$r:n@.$7!$L$CNG[Ns$N(BDNA$B@ZCGCGJR$r(BPCR$B$K$h$jA}I}$G$-$k$3$H$r3NG'$7$?!#$3$l$i$N(B1$BJ,;R$rBP>]$H$7$?A`:nK!$J$i$S$KJ,;R2C9)!&H?1~A`:n$K$D$$$F>R2p$r$5$;$F$$$?$@$/!#(B

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$B!J(B11$B!K%;%_%$%s%?%/%H:YK&7O$H(BGFP$B2D;k2=5;=Q$rMQ$$$?:YK&Fb%*%k%,%M%i%@%$%J%_%/%9$N8&5f(B

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$B!J(B15$B!K(BEnergy landscape of a peptide, cut from a distal $B&B(B-hairpin of SH3 domain, including random-coil,$B&B(B-hairpin, and $B&A(B-helix, and pathways among the conformations

Kazuyoshi Ikeda and Junichi Higo$B!JEl5~Lt2JBg3X!K(B

$B!!(BWe studied the energy landscape of a peptide [Ace-Ala- His-Ser-Leu-Thr-Thr-Gly-Gln-Thr-Nme] with multicanonical MD simulation. This peptide sequence was derived from the 45$B!G(Bth to 53$B!G(Bth residues of the src SH3 domain. The conformation of the sequence in the SH3 domain is a $B&B(B-hairpin. The peptide was confined to a water sphere.
$B!!(BThe obtained energy landscape was separated into some clusters of well-structured conformations as well as random ones. The probabilities of existence for each conformation at 300 K were 8% for the $B&B(B-hairpin, 18% for the $B&A(B-helix, and 68% for the random-coil. The current work showed that the peptide has a potential tendency to a-helix conformations, although it takes the $B&B(B-hairpin in the whole protein. In this study, the pathways for the structural changes among those conformations were discussed. And a possible pathway for the whole protein folding of the SH3 domain was also proposed with investigating the energy landscape.

$B!J(B16$B!K?e$NMI$i$.$HH?1~!(?e$OG!2?$KE`$k$+!$H?1~$NJ}8~@-$HMI$i$.$rG!2?$K4QB,$G$-$k$+!)(B

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$B!!@8L?%7%9%F%`$rFbIt$N%@%$%J%_%/%9$HAj8_:nMQ$,YI93$9$kA}?#7O$N<($9IaJWE*8=>]$H$7$FB*$(!$H/@82aDx!$?J2=$r5DO@$9$k!#M}A[2=$7$?:YK&7O$H$7$F!$FbIt$G$N2=3XH?1~!$:YK&4VAj8_:nMQ!$$=$7$FJ,Nv$+$i$J$kNO3X7O$r9M$($k!#$=$N7O$NIaJWE*$J@-l$G$N:YK&@8J*3X$N

$B!J(B19$B!K(BElectrostatic free energy calculation of solvent ion transfer from outside to inside cavity of wild type and mutant horse L ferritin

Takuya Takahashi$B!J7W;;2J3X8&5f%;%s%?!

$B!!(BA ferritin is an iron storage protein that has an 80 $B"r(B diameter cavity inside and is composed of 24 subunits which assembled with cubic symmetry. The electrostatic free energy changes of transferring divalent and monovalent cations from outside to cavity in wild type and mutant horse L ferritin molecules were calculated at neutral pH region by solving the Poisson equation in the channel region and the Poisson-Boltzman equation in solvent region with finite difference method. The molecule has two types of channels connecting outside and inside. One is hydrophobic channel at the 4-fold axis and the other is hydrophilic channel at the 3-fold axis. First, the calculated electrostatic potential inside the cavity of the wild type molecule showed the negative net charge. In case of the 4-fold channels, large potential barriers mainly due to self energy were found for both cations and anions. So, it was almost negligible for ions to pass through the hydrophobic 4-fold channel, especially for divalent cations such as Fe, Cd and Ca that have large self energy, ~50 kT. On the other hand, the 3-fold channels have cation binding sites where one deep energy well for single ion transfer, ~-30 kT, was found near the Glu134 and Asp131 50 $B"r(Bfar from the molecular center. Then, multi ion transfer profile was calculated. Both the divalent and monovalent cations can pass through the 3-fold channel with only a few kT barrier. In addition to this finding the experimentally obtained positions of three Cd2+ binding sites in the 3-fold channel was well reproduced. Second, the electrostatic potential of the mutant ferritin, which have no cation binding sites (i.e., Glu134 and Asp131) at the 3-fold channel and several inside Glu residues were changed to Lys, was calculated.The potential inside the cavity was positive and transfer of divalent cation was quite unfavorable for both the channels. These calculated results were in good accord with experimental facts that the mutant ferritin molecule showed almost no iron storage.

$B!J(B20$B!KJ,;R%]%s%W$NJ}8~@-$r7h$a$k$b$N!'CAGr

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$B!!K\9V1i$G$O!$2f!9$NDc29@V30J,8wK!$rMQ$$$?8&5f$rCf?4$H$7$F!$J,;R%]%s%W$NJ}8~@-$r7h$a$k%a%+%K%:%`$K$D$$$F5DO@$7$?$$!#2f!9$N

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Copyright(C) 2002 National Institute for Physiological Sciences