UNK

UNKNOWN

Created: 1999-07-08
Last modified:  2023-11-03

UNK is the code for unknown amino acids only. For example, a poly-ALA or poly-GLY chain would be processed as poly-UNK, if the author does not know how the coordinates align with the sequence and the residue numbering is arbitrary.

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Chemical Details

Formal Charge0
Atom Count16
Chiral Atom Count1
Bond Count15
Aromatic Bond Count0
2D diagram of UNK
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Chemical Component Summary

NameUNKNOWN
Systematic Name (OpenEye OEToolkits)(2S)-2-aminobutanoic acid
FormulaC4 H9 N O2
Molecular Weight103.12
TypeL-PEPTIDE LINKING

Chemical Descriptors

TypeProgram Version Descriptor
SMILESACDLabs10.04O=C(O)C(N)CC
SMILESCACTVS3.341CC[CH](N)C(O)=O
SMILESOpenEye OEToolkits1.5.0CCC(C(=O)O)N
Canonical SMILESCACTVS3.341 CC[C@H](N)C(O)=O
Canonical SMILESOpenEye OEToolkits1.5.0 CC[C@@H](C(=O)O)N
InChIInChI1.03 InChI=1S/C4H9NO2/c1-2-3(5)4(6)7/h3H,2,5H2,1H3,(H,6,7)/t3-/m0/s1
InChIKeyInChI1.03 QWCKQJZIFLGMSD-VKHMYHEASA-N

Related Resource References

Resource NameReference
PubChem 6971252, 80283
ChEMBL CHEMBL1230782
ChEBI CHEBI:74359, CHEBI:35619
CCDC/CSD KENDUC, TANCAO, GEJLEN, IFALEG, FITJAT, ZAPCOK, BERQAQ, DLABUT12, HOSMOS, ABUBTE, POVYEF, GEJCAA, BERNAN, HOSLOR, VEDZUC01
COD 7205608