Macromolecule Content

• Total Structure Weight: 3.08 kDa 
• Atom Count: 171 
• Modelled Residue Count: 25 
• Deposited Residue Count: 31 
• Unique protein chains: 1

2HM3

Nematocyst outer wall antigen, cysteine rich domain NW1

• DOI: 10.2210/pdb2HM3/pdb

• Classification: STRUCTURAL PROTEIN
• Organism(s): Hydra vulgaris
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2006-07-11 Released: 2007-02-06 
• Deposition Author(s): Meier, S., Jensen, P.R., Grzesiek, S., Oezbek, S.

---

Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 10 
• Selection Criteria: target function 

Literature

Sequence-Structure and Structure-Function Analysis in Cysteine-rich Domains Forming the Ultrastable Nematocyst Wall.

Meier, S., Jensen, P.R., Adamczyk, P., Bachinger, H.P., Holstein, T.W., Engel, J., Ozbek, S., Grzesiek, S.

(2007) J Mol Biol 368: 718-728

• PubMed: 17362991 
• DOI: 10.1016/j.jmb.2007.02.026
• Primary Citation of Related Structures:  
  2NX7, 2NX6, 2HM3


• PubMed Abstract: 
  

The nematocyst wall of cnidarians is a unique biomaterial that withstands extreme osmotic pressures, allowing an ultrafast discharge of the nematocyst capsules. Assembly of the highly robust nematocyst wall is achieved by covalent linkage of cysteine-rich domains (CRDs) from two main protein components, minicollagens and nematocyst outer wall antigen (NOWA). The bipolar minicollagens have different disulfide patterns and topologies in their N and C-terminal CRDs. The functional significance of this polarity has been elusive. Here, we show by NMR structural analysis that all representative cysteine-rich domains of NOWA are structurally related to N-terminal minicollagen domains. Natural sequence insertions in NOWA CRDs have very little effect on the tightly knit domain structures, nor do they preclude the efficient folding to a single native conformation. The different folds in NOWA CRDs and the atypical C-terminal minicollagen domain on the other hand can be directly related to different conformational preferences in the reduced states. Ultrastructural analysis in conjunction with aggregation studies argues for an association between the similar NOWA and N-terminal minicollagen domains in early stages of the nematocyst wall assembly, which is followed by the controlled association between the unusual structures of C-terminal minicollagen domains.

---

Related Citations: 

• Continuous molecular evolution of protein-domain structures by single amino Acid changes.
  Meier, S., Jensen, P.R., David, C.N., Chapman, J., Holstein, T.W., Grzesiek, S., Ozbek, S.
  (2007) Curr Biol 17: 173

---

Organizational Affiliation: 

Department of Structural Biology, Biozentrum, University of Basel, Klingelbergstrasse 70, CH-4056 Basel, Switzerland. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Nematocyst outer wall antigen	A	31	Hydra vulgaris	Mutation(s): 0  Gene Names: NOWA
Find proteins for Q8IT70 (Hydra vulgaris) Explore Q8IT70  Go to UniProtKB:  Q8IT70

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 10 
• Selection Criteria: target function 
• OLDERADO: 2HM3 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-07-11 
• Released Date: 2007-02-06 
Deposition Author(s): Meier, S., Jensen, P.R., Grzesiek, S., Oezbek, S.

Revision History  

• Version 1.0: 2007-02-06
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance