List of modifications

Initial residue   Modification type    

Modified residue   Chemical compound  
ARG MS2C RMS symmetric-dimethylarginine (+1)
ARG ME1C RMC omega-N-methylarginine (+1)
ARG MA2N RAM asymmetric-dimethylarginine (0)
ARG MA2C RMA asymmetric-dimethylarginine (+1)
ARG METY RMN omega-N-methylarginine (0)
ARG CITR RCI citrulline
ARG GSAL GSA glutamic semialdehyde
ARG PHO2 R1P phosphoarginine (-1)
ARG PHOS R0P phosphoarginine (0)
ARG MS2N RSM symmetric-dimethylarginine (0)
ASN HYDR N3H 3-hydroxyasparagine (R)
ASN NGLY NNG N-acetylglucosamine
ASN HYDS NH3 3-hydroxyasparagine (S)
ASN METY NME N4-methylasparagine
ASN DEAC ASP aspartic acid (-1)
ASP HYCS D3H 3-hydroxyaspartate (-1, S)
ASP HYDC DH3 3-hydroxyaspartate (-1, R)
ASP PHO2 D2P phosphoaspartate (-2)
ASP PHOS D1P phosphoaspartate (-1)
ASP HYDR DN3 3-hydroxyaspartate (0, R)
ASP HYDS D3N 3-hydroxyaspartate (0, S)
ASP METY DMA aspartate methyl ester
CYS HYDR CYH cysteine sulfenic acid
CYS METY CYM S-methylcysteine
CYS NITR CSN S-nitrosocysteine
CYS CAAM CAM S-carbamoyl-cysteine
CYS SULF CSE cysteic acid
CYS OXID CSA cysteine sulfinic acid
GLN HYDS QH4 4-hydroxyglutamine (S)
GLN HYDR Q4H 4-hydroxyglutamine (R)
GLN METY QME N5-methylglutamine
GLN DEAC GLU glutamic acid (-1)
GLU CARN ECN 4-carboxyglutamate (-1)
GLU CARB ECA 4-carboxyglutamate (-2)
GLU METY EME glutamate methyl ester
HIS OXID H2X 2-oxo-histidine
HIS PH32 H32 3-phosphohistidine (-2)
HIS M13N H3M 3-methylhistidine (0)
HIS H2NN ASN asparagine
HIS H2DC ASP aspartic acid (-1)
HIS M13C H3C 3-methylhistidine (+1)
HIS M11N H1M 1-methylhistidine (0)
HIS PH31 H31 3-phosphohistidine (-1)
HIS PH12 H12 1-phosphohistidine (-2)
HIS PH11 H11 1-phosphohistidine (-1)
HIS M11C H1C 1-methylhistidine (+1)
LEU HY5S LH5 5-hydroxyleucine (S)
LEU NORL LNO norleucine
LEU HYD5 L5H 5-hydroxyleucine (R)
LEU HYD4 L4H 4-hydroxyleucine
LEU HY3S LH3 3-hydroxyleucine (S)
LEU HYD3 L3H 3-hydroxyleucine (R)
LYS PHO2 K2P phospholysine (-2)
LYS PHOS K1P phospholysine (-1)
LYS ALLY KAL allysine
LYS LYSA KLA alpha-lysyllysine
LYS HYPS KHS hypusine (S)
LYS NORL LNO norleucine
LYS HYPR KHR hypusine (R)
LYS LYSB KLB beta-lysyllysine
LYS ACET KAC N-acetyllysine
LYS HYCS KHP 5-hydroxylysine (+1, S)
LYS HYDR KH5 5-hydroxylysine (0, R)
LYS HYDS K5H 5-hydroxylysine (0, S)
LYS HYDC KPH 5-hydroxylysine (+1, R)
LYS METY KMN methyllysine (0)
LYS CARN KCN carboxylysine (0)
LYS ME2C K2C N6,N6-dimethyllysine (+1)
LYS MET3 K3C N6,N6,N6-trimethyllysine
LYS CARB KCA carboxylysine (-1)
LYS CAAM KAM homocitrulline
LYS ME1C KMC N6-methyllysine (+1)
LYS MET2 K2M N6,N6-dimethyllysine (0)
MET OXID MSX methionine sulfoxide (R)
MET NORL LNO norleucine
MET OXIS MXS methionine sulfoxide (S)
MET SULF MES methionine sulfone
PHE HYD3 F3H 3-hydroxyphenylalanine
PHE HYD2 F2H 2-hydroxyphenylalanine
PHE HYD4 TYR tyrosine
PHE HYDD F23 2,3-dihydroxyphenylalanine
PRO GSAL GSA glutamic semialdehyde
PRO HYDD PHH 3,4-dihydroxyproline
PRO HY4S HY2 4-hydroxyproline (R)
PRO HYD4 HYP 4-hydroxyproline (S)
PRO OXID PGA pyroglutamic acid
PRO HY3S P3H 3-hydroxyproline (S)
PRO HYD5 PH5 5-hydroxyproline (R)
PRO HY5S P5H 5-hydroxyproline (S)
PRO HYD3 PH3 3-hydroxyproline (R)
SER OGLY SOG serine-O-acetylglucosamine
SER DEHY SDH dehydroalanine
SER PHOS S1P phosphoserine (-1)
SER PHO2 S2P phosphoserine (-2)
THR PHO2 T2P phosphothreonine (-2)
THR OXID TOX 2-amino-3-ketobutyric acid
THR OGLY TOG threonine-O-acetylglucosamine
THR PHOS T1P phosphothreonine (-1)
THR DEHY TDH 2,3-didehydrobutyrine
TRP BROM WBR 6-bromotryptophan
TRP HYKY WKH 3-hydroxykynurenine
TRP KYNU WKY kynurenine
TRP FOKY WKF formyl-kynurenine
TRP HYD2 W2H 2-hydroxytryptophan
TRP HYD4 W4H 4-hydroxytryptophan
TRP HYD6 W6H 6-hydroxytryptophan
TRP HYD5 W5H 5-hydroxytryptophan
TRP NITR WNI 6-nitrotryptophan
TRP HYD7 W7H 7-hydroxytryptophan
TYR NITO YNB nitrotyrosine (neutral) old
TYR NITN YNN nitrotyrosine (0) pre-revised
TYR CHLO YCH chlorotyrosine
TYR HYDR HTY 3,4-dihydroxyphenylalanine
TYR PHO2 Y2P phosphotyrosine (-2)
TYR PHOS Y1P phosphotyrosine (-1)
TYR SULF YSU sulfotyrosine
TYR NITR YNI nitrotyrosine (-1)
VAL HYD3 V3H 3-hydroxyvaline

In addition, a set of terminal modifications is also available.