Insulin-like proteins in C. elegans

Image of Q09628 generated with the Swiss-PdbViewer and POV-Ray by Nicolas Guex
L. Duret, N. Guex, MC. Peitsch & A. Bairoch (1998) Genome Research 8:348-353

We have identified three new families of insulin homologs in C. elegans. In two of these families, concerted mutations suggest that an additional disulfide bond links B and A domains, and that the A-domain internal disulfide bond is substituted by a hydrophobic interaction (Q21506/Q21508). Comparative protein modelling remarkably confirms these predictions and shows that despite this atypical disulfide bond pattern and the absence of C-like peptide, all these proteins may adopt the same fold as the insulin. 

HEADER    INSULIN-LIKE HORMONES                   18-NOV-97
COMPND    INSULIN-LIKE GROWTH FACTOR
SOURCE    C.ELEGANS (CAENORHABDITIS ELEGANS)
AUTHOR    L.DURET,N.GUEX,M.C.PEITSCH,A.BAIROCH
JRNL        AUTH   L.DURET,N.GUEX,M.C.PEITSCH,A.BAIROCH
JRNL        TITL   NEW INSULIN-LIKE PROTEINS WITH ATYPICAL   
JRNL        TITL 2 DISULFIDE BOND PATTERN CHARACTERIZED IN                     
JRNL        TITL 3 CAENORHABDITIS ELEGANS BY COMPARATIVE SEQUENCE                   
JRNL        TITL 4 ANALYSIS AND HOMOLOGY MODELING                
JRNL        REF    GENOME RESEARCH     8:348-353   (1998)
REMARK   1
REMARK   1 RESOLUTION. NOT APPLICABLE.  SEE REMARK 2. 
REMARK   2 Model of c.elegans insulin-like peptide (TREMBL entry Q09628)
REMARK   2 Template used: pdb entry 3gf1, nmr model #1
REMARK   2 Programs used: Swiss-PdbViewer
REMARK   2 Final energy minimisation: CHARMM
Get the co-ordinates for Q09628 
HEADER    INSULIN-LIKE HORMONES                   18-NOV-97
COMPND    INSULIN-LIKE GROWTH FACTOR
SOURCE    C.ELEGANS (CAENORHABDITIS ELEGANS)
AUTHOR    L.DURET,N.GUEX,M.C.PEITSCH,A.BAIROCH
JRNL        AUTH   L.DURET,N.GUEX,M.C.PEITSCH,A.BAIROCH
JRNL        TITL   NEW INSULIN-LIKE PROTEINS WITH ATYPICAL   
JRNL        TITL 2 DISULFIDE BOND PATTERN CHARACTERIZED IN                     
JRNL        TITL 3 CAENORHABDITIS ELEGANS BY COMPARATIVE SEQUENCE                   
JRNL        TITL 4 ANALYSIS AND HOMOLOGY MODELING                
JRNL        REF    GENOME RESEARCH     8:348-353   (1998)
REMARK   1
REMARK   1 RESOLUTION. NOT APPLICABLE.  SEE REMARK 2. 
REMARK   2 Model of c.elegans insulin-like peptide (TREMBL entry Q21506)
REMARK   2 Template used: pdb entry 3gf1, nmr model #4
REMARK   2 Programs used: Swiss-PdbViewer and SWISS-MODEL
REMARK   2 Final energy minimisation: CHARMM
Get the co-ordinates for Q21506 
HEADER    INSULIN-LIKE HORMONES                   18-NOV-97
COMPND    INSULIN-LIKE GROWTH FACTOR
SOURCE    C.ELEGANS (CAENORHABDITIS ELEGANS)
AUTHOR    L.DURET,N.GUEX,M.C.PEITSCH,A.BAIROCH
JRNL        AUTH   L.DURET,N.GUEX,M.C.PEITSCH,A.BAIROCH
JRNL        TITL   NEW INSULIN-LIKE PROTEINS WITH ATYPICAL   
JRNL        TITL 2 DISULFIDE BOND PATTERN CHARACTERIZED IN                     
JRNL        TITL 3 CAENORHABDITIS ELEGANS BY COMPARATIVE SEQUENCE                   
JRNL        TITL 4 ANALYSIS AND HOMOLOGY MODELING                
JRNL        REF    GENOME RESEARCH     8:348-353   (1998)
REMARK   1
REMARK   1 RESOLUTION. NOT APPLICABLE.  SEE REMARK 2. 
REMARK   2 model of c.elegans insulin-like peptide (TREMBL entry Q21508)
REMARK   2 template used: pdb entry 3gf1, nmr model #4
REMARK   2 programs used: Swiss-PdbViewer and SWISS-MODEL
REMARK   2 final energy minimisation: CHARMM
Get the co-ordinates for Q21508
A few images from our Genome Research paper:

Torsten Schwede , Manuel C. Peitsch & Nicolas Guex.