GtoPdb is requesting financial support from commercial users. Please see our sustainability page for more information.

siamycin I   Click here for help

GtoPdb Ligand ID: 14232

Synonyms: Siamycin-I
Compound class: Peptide
Comment: Siamycin I is an antimicrobial lasso peptide produced by Streptomyces sp. AA6532 and originally isolated from soil samples [5]. Siamycin I exhibits both antibacterial activity against Gram-positive bacteria [2] and antiviral activity against the HIV virus, interacting with HIV-1 envelope glycoprotein 160 (gp160) which is essential for fusion of the viral envelope with the host cell membrane [3].
2D Structure
Click here for help

2D Structure

An image of the ligand's 2D structure. For small molecules with SMILES these are drawn using the NCI/CADD Chemical Identifier Resolver. Click on the image to access the chemical structure search tool with the ligand pre-loaded in the structure editor. For other types of ligands, e.g. longer nucleotides and peptides, a manually drawn representation of the molecule may be provided.

✖
Click here for structure editor
SMILES / InChI / InChIKey
Click here for help

SMILES / InChI / InChIKey

SMILES (Simplified Molecular Input Line Entry Specification) A specification for unambiguously describing the structure of chemical molecules using short ASCII strings. Canonical SMILES specify a unique representation of the 2D structure without chiral or isotopic specifications. Isomeric SMILES include chiral specification and isotopes.

Standard InChI (IUPAC International Chemical Identifier) and InChIKey InChI is a non-proprietary, standard, textual identifier for chemical substances designed to facilitate linking of information and database searching. An InChIKey is a simplified version of a full InChI, designed for easier web searching.

Generated using the Chemistry Development Kit (CDK) (Willighagen EL et al. Journal of Cheminformatics vol. 9:33. 2017, doi:10.1186/s13321-017-0220-4; https://cdk.github.io/)

✖
Canonical SMILES CC[C@H](C)[C@H]1C(=O)N[C@@H](C(C)C)C(=O)N[C@@H](CSSC[C@H]2C(=O)N[C@@H](CC(=O)N)C(=O)N[C@H]3CC(=O)N[C@@H](CSSC[C@@H](C(=O)NCC(=O)N[C@@H](CC4=CC=C(C=C4)O)C(=O)N[C@@H](C)C(=O)N1)NC(=O)CNC(=O)[C@H](C)NC(=O)[C@H](CC5=CC=CC=C5)NC3=O)C(=O)N[C@@H](CC(C)C)C(=O)NCC(=O)N[C@@H](C(C)C)C(=O)NCC(=O)N[C@@H](CO)C(=O)N2)C(=O)N[C@@H](CC6=CC=CC=C6)C(=O)N[C@@H](CC7=CNC8=C7C=CC=C8)C(=O)O
Isomeric SMILES CC[C@H](C)[C@H]1C(=O)N[C@H](C(=O)N[C@@H](CSSC[C@H]2C(=O)N[C@H](C(=O)N[C@H]3CC(=O)N[C@@H](CSSC[C@@H](C(=O)NCC(=O)N[C@H](C(=O)N[C@H](C(=O)N1)C)CC4=CC=C(C=C4)O)NC(=O)CNC(=O)[C@@H](NC(=O)[C@@H](NC3=O)CC5=CC=CC=C5)C)C(=O)N[C@H](C(=O)NCC(=O)N[C@H](C(=O)NCC(=O)N[C@H](C(=O)N2)CO)C(C)C)CC(C)C)CC(=O)N)C(=O)N[C@@H](CC6=CC=CC=C6)C(=O)N[C@@H](CC7=CNC8=CC=CC=C87)C(=O)O)C(C)C
InChI InChI=1S/C97H131N23O26S4/c1-11-50(8)80-96(144)119-79(49(6)7)95(143)117-71(93(141)112-63(32-54-22-16-13-17-23-54)87(135)115-66(97(145)146)34-56-37-99-59-25-19-18-24-58(56)59)46-150-149-45-70-92(140)113-64(35-72(98)123)88(136)114-65-36-73(124)108-69(91(139)110-60(30-47(2)3)83(131)101-41-77(128)118-78(48(4)5)94(142)103-40-75(126)107-67(42-121)90(138)116-70)44-148-147-43-68(109-76(127)38-100-81(129)51(9)104-86(134)62(111-89(65)137)31-53-20-14-12-15-21-53)84(132)102-39-74(125)106-61(33-55-26-28-57(122)29-27-55)85(133)105-52(10)82(130)120-80/h12-29,37,47-52,60-71,78-80,99,121-122H,11,30-36,38-46H2,1-10H3,(H2,98,123)(H,100,129)(H,101,131)(H,102,132)(H,103,142)(H,104,134)(H,105,133)(H,106,125)(H,107,126)(H,108,124)(H,109,127)(H,110,139)(H,111,137)(H,112,141)(H,113,140)(H,114,136)(H,115,135)(H,116,138)(H,117,143)(H,118,128)(H,119,144)(H,120,130)(H,145,146)/t50-,51-,52-,60-,61-,62-,63-,64-,65-,66-,67-,68-,69-,70-,71-,78-,79-,80-/m0/s1
InChI Key TXYRKTDGDMHVHR-NEKRQKPVSA-N

Generated using the Chemistry Development Kit (CDK) (Willighagen EL et al. Journal of Cheminformatics vol. 9:33. 2017, doi:10.1186/s13321-017-0220-4; https://cdk.github.io/)
Bioactivity Comments
Siamycin I demonstrates antibacterial activity against Gram-positive bacteria, including methicillin-resistant Staphylococcus auereus (MRSA) and vancomycin-resistant enterococci (VRE) with an MIC of 7.4 μM [2].