1AHB
THE N-GLYCOSIDASE MECHANISM OF RIBOSOME-INACTIVATING PROTEINS IMPLIED BY CRYSTAL STRUCTURES OF ALPHA-MOMORCHARIN
External Resource: Annotation
Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage
Chains | Domain Info | Class | Fold | Superfamily | Family | Domain | Species | Provenance Source (Version) |
---|---|---|---|---|---|---|---|---|
A | d1ahba_ | Alpha and beta proteins (a+b) | Ribosome inactivating proteins (RIP) | Ribosome inactivating proteins (RIP) | Plant cytotoxins | alpha-Momorcharin (momordin) | balsam pear (Momordica charantia ) [TaxId: 3673 ], | SCOPe (2.08) |
Domain Annotation: SCOP2 Classification SCOP2 Database Homepage
Domain Annotation: ECOD Classification ECOD Database Homepage
Domain Annotation: CATH CATH Database Homepage
Chain | Domain | Class | Architecture | Topology | Homology | Provenance Source (Version) |
---|---|---|---|---|---|---|
A | 3.40.420.10 | Alpha Beta | 3-Layer(aba) Sandwich | Ricin (A subunit) | domain 1 | CATH (4.3.0) |
A | 4.10.470.10 | Few Secondary Structures | Irregular | Ricin (A Subunit), domain 2 | Ricin (A Subunit), domain 2 | CATH (4.3.0) |
Protein Family Annotation Pfam Database Homepage
Chains | Accession | Name | Description | Comments | Source |
---|---|---|---|---|---|
PF00161 | Ribosome inactivating protein (RIP) | Ribosome inactivating protein | Domain |
Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage
InterPro: Protein Family Classification InterPro Database Homepage
Chains | Accession | Name | Type |
---|---|---|---|
IPR036041 | Ribosome-inactivating protein superfamily | Homologous Superfamily | |
IPR017988 | Ribosome-inactivating protein conserved site | Conserved Site | |
IPR016139 | Ribosome-inactivating protein, subdomain 2 | Homologous Superfamily | |
IPR017989 | Ribosome-inactivating protein type 1/2 | Family | |
IPR016138 | Ribosome-inactivating protein, subdomain 1 | Homologous Superfamily | |
IPR001574 | Ribosome-inactivating protein | Family |
Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage
Chains | Enzyme Name | Description | Catalytic Residues |
---|---|---|---|
rRNA N-glycosylase M-CSA #825 | Abrin-A from the seeds of Abrus precatorius is a type II ribosome-inactivating protein (RIP) alongside the homologue Ricin. Like Ricin, it catalyses the endohydrolysis of the N-glycosidic bond at one specific adenosine A4324 on the 28S rRNA. This inhibition of protein biosynthesis is anti-carcinogenic. Abrin-A is composed of two chains which are linked by a disulphide bond. Type I RIPs such as α-Momorcharin however have a single chain, still retaining rRNA-glycosylase activity and share identical catalytic residues to Abrin-A and also excise adenines from a highly conserved loop rRNA. | EC: 3.2.2.22 (PDB Primary Data) |