| EC |
3.4.15.6 |
| Accepted name: |
cyanophycinase |
| Reaction: |
[L-Asp(4-L-Arg)]n + H2O = [L-Asp(4-L-Arg)]n-1 + L-Asp(4-L-Arg) |
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For diagram of cyanophycin biosynthesis, click here |
| Glossary: |
cyanophycin = [L-Asp(4-L-Arg)]n = N-β-aspartylarginine = [L-4-(L-arginin-2-N-yl)aspartic acid]n = poly{N4-[(1S)-1-carboxy-4-guanidinobutyl]-L-asparagine} |
| Other name(s): |
cyanophycin degrading enzyme; β-Asp-Arg hydrolysing enzyme; CGPase; CphB; CphE; cyanophycin granule polypeptidase; extracellular CGPase |
| Comments: |
The enzyme is highly specific for the branched polypeptide cyanophycin and does not hydrolyse poly-L-aspartate or poly-L-arginine [3]. A serine-type exopeptidase that belongs in peptidase family S51. |
| Links to other databases: |
BRENDA, EXPASY, KEGG, MetaCyc, MEROPS, PDB, CAS registry number: 131554-16-0 |
| References: |
| 1. |
Obst, M., Krug, A., Luftmann, H. and Steinbüchel, A. Degradation of cyanophycin by Sedimentibacter hongkongensis strain KI and Citrobacter amalonaticus strain G isolated from an anaerobic bacterial consortium. Appl. Environ. Microbiol. 71 (2005) 3642–3652. [DOI] [PMID: 16000772] |
| 2. |
Obst, M., Oppermann-Sanio, F.B., Luftmann, H. and Steinbüchel, A. Isolation of cyanophycin-degrading bacteria, cloning and characterization of an extracellular cyanophycinase gene (cphE) from Pseudomonas anguilliseptica strain BI. The cphE gene from P. anguilliseptica BI encodes a cyanophycin-hydrolyzing enzyme. J. Biol. Chem. 277 (2002) 25096–25105. [DOI] [PMID: 11986309] |
| 3. |
Richter, R., Hejazi, M., Kraft, R., Ziegler, K. and Lockau, W. Cyanophycinase, a peptidase degrading the cyanobacterial reserve material multi-L-arginyl-poly-L-aspartic acid (cyanophycin): molecular cloning of the gene of Synechocystis sp. PCC 6803, expression in Escherichia coli, and biochemical characterization of the purified enzyme. Eur. J. Biochem. 263 (1999) 163–169. [DOI] [PMID: 10429200] |
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| [EC 3.4.15.6 created 2007] |
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