<div>Hi gromacs users</div>
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<div>I will use amber 03 forcefield for simulation of protein-dna interaction. but why ffamber03.atp is as follow :</div>
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<div>amber99_0 1.00800 ; H0 H aliph. bond. to C with 1 electrwd. group (03GLY)<br>amber99_1 79.90000 ; BR bromine<br>amber99_2 12.01000 ; C sp2 C carbonyl group<br>amber99_3 12.01000 ; CA sp2 C pure aromatic (benzene)<br>
amber99_4 12.01000 ; CB sp2 aromatic C, 5&6 membered ring junction<br>amber99_5 12.01000 ; CC sp2 aromatic C, 5 memb. ring HIS<br>amber99_6 12.01000 ; CK sp2 C 5 memb.ring in purines<br>amber99_7 12.01000 ; CM sp2 C pyrimidines in pos. 5 & 6<br>
amber99_8 12.01000 ; CN sp2 C aromatic 5&6 memb.ring junct.(TRP)<br>amber99_9 12.01000 ; CQ sp2 C in 5 mem.ring of purines between 2 N<br>amber99_10 12.01000 ; CR sp2 arom as CQ but in HIS</div>
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<div>why amber99 instead of amber03?</div>
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<p>Any help will highly appreciated!</p></font></div>