CVFF Atom List


CVFF Forcefield Atom List

Atom Description
h Hydrogen bonded to C. Masses from CRC 1973/74 pages B-250
d General Deuterium
hn Hydrogen bonded to N
ho Hydrogen bonded to O
hp Hydrogen bonded to P
hs Hydrogen bonded to S
h* Hydrogen in water molecule
hspc Hydrogen in SPC water molecule
htip Hydrogen in TIP water molecule
h$ Hydrogen atom for automatic parameter assignment
lp Lone Pair
lp Lone Pair
h+ Charged hydrogen in cations
hc Hydrogen bonded to carbon
hi Hydrogen in charged imidazole ring
hw Hydrogen in water
dw Deuterium in heivy water
c Sp3 aliphatic carbon
cg Sp3 alpha carbon in glycine
c' Sp2 carbon in carbonyl (C=O) group
c* Carbon in carbonyl group, non_amides
c" Carbon in carbonyl group, non_amides
cp Sp2 aromatic carbon (partial double bonds)
cr Carbon in guanidinium group (HN=C(NH2)2)
c+ C in guanidinium group
c- Carbon in charged carboxylate (COO-) group
ca General amino acid alpha carbon (sp3)
c3 Sp3 carbon in methyl (CH3) group
cn Sp3 Carbon bonded to N
c2 Sp3 carbon bonded to 2 H's, 2 heavy atoms
c1 Sp3 carbon bonded to 1 H, 3 Heavy atoms
c5 Sp2 aromatic carbon in five membered ring
cs Sp2 carbon involved in thiophene
c= Non aromatic end doubly bonded carbon
c=1 Non aromatic, next to end doubly bonded carbon
c=2 Non aromatic doubly bonded carbon
ct Sp carbon involved in triple bond
ci Aromatic carbon in a charged imidazole ring (HIS+)
c$ Carbon atom for automatic parameter assignment
co Sp3 carbon in acetals
c3m Sp3 carbon in 3-membered ring
c4m Sp3 carbon in 4-membered ring
coh Sp3 carbon in acetals with hydrogen
c3h Sp3 carbon in 3-membered ring with hydrogens
c4h Sp3 carbon in 4-membered ring with hydrogens
ci Sp2 aromatic carbon in charged imidazole ring (His+)
n Sp2 nitrogen with 1 H, 2 heavy atoms (amide group)
no Sp2 nitrogen in nitro group
n2 Sp2 nitrogen (NH2 in the guanidinium group (HN=C(NH2)2))
np Sp2 aromatic nitrogen (partial double bonds)
n3 Sp3 nitrogen with three substituents
n4 Sp3 nitrogen with four substituents
n= Non aromatic end double bonded nitrogen
n=1 Non aromatic, next to end doubly bonded carbon
n=2 Non aromatic doubly bonded nitrogen
nt Sp nitrogen involved in triple bond
nz Sp nitrogen in N2
n1 Sp2 nitrogen in charged arginine
ni Sp2 nitrogen in a charged imidazole ring (HIS+)
n$ Nitrogen atom for automatic parameter assignment
na Sp3 nitrogen in amines
n3m Sp3 nitrogen in 3- membered ring
n4m Sp3 nitrogen in 4- membered ring
n3n Sp2 nitrogen in 3- membered ring
n4n Sp2 nitrogen in 4- membered ring
nb sp2 nitrogen in aromatic amines
nn sp2 nitrogen in aromatic amines
npc sp2 nitrogen in 5- or 6- membered ring bonded to a heavy atom
nh sp2 nitrogen in 5-or 6- membered ring with hydrogen attached
nho sp2 nitrogen in 6- membered ring next to a carbonyl group and with a hydrogen
nh+ protonated nitrogen in 6- membered ring with hydrogen attached
n+ sp3 nitrogen in protonated amines
nr sp2 nitrogen (NH2) in guanidinium group (HN=C(NH2)2)
o' Oxygen in carbonyl (C=O) group
o sp3 oxygen in ether or ester groups
oz Oxygen stub for catalysis
o- Oxygen in charged carboxylate (COO-) group
oh Oxygen in hydroxyl (OH) group
o* Oxygen in water molecule
ospc Oxygen in SPC water molecule
otip Oxygen in TIP3P water molecule
op Oxygen in aromatic rings. e.g. furan
of
o$ Oxygen atom for automatic parameter assignment
oc sp3 oxygen in ether or acetals
oe sp3 oxygen in ester
o3e sp3 oxygen in three membered ring
o4e sp3 oxygen in four membered ring
s Sulfur in methionine (C-S-C) group
s1 Sulfu involved in S-S disulfide bond
sh Sulfur in sulfhydryl (-SH) group
sp Sulfur in thiophene
s' Sulfur in thioketone (>C=S) group
s$ Sulfur atom for automatic parameter assignment
sc sp3 sulfur in methionines (C-S-C) group
s3e sulfur in three membered ring
s4e sulfur in four membered ring
s- partial double sulfur bonded to something then bonded to another partial double oxygen
p General phosphorous atom
pz Phosphorous atom stub for catalysis
p$ Phosphorous atom for automatic parameter assignment
ca+ ion - Ca++, mass = mass of Ca - 2*electron mass.
f Fluorine bonded to a carbon
cl Chlorine bonded to a carbon
br Bromine bonded to a carbon
i Covalently bound Iodine
si Silicon
sz Silicon stub for catalysis
nu atom for relative free energy
Cl Chloride ion Cl-
Br Bromide ion Br-
Na Sodium ion
ar Argon

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Last updated: 01/23/2001