Identification of a novel family of snake venom proteins Veficolins from Cerberus rynchops using a venom gland transcriptomics and proteomics approach.
Cerberus rynchops (dog-faced water snake) belongs to Homalopsidae of Colubroidea (rear-fanged snakes). So far, venom compositions of snakes of the Homalopsidae family are not known. To determine the venom composition of C. rynchops, we have used both transcriptomics and proteomics approaches. The venom gland transcriptome revealed 104 ESTs and the presence of three known snake protein families, namely, metalloprotease, CRISP, and C-type lectin. In addition, we identified two proteins that showed sequence homology to ficolin, a mammalian protein with collagen-like and fibrinogen-like domains. We named them as ryncolin 1 and ryncolin 2 (rynchops ficolin) and this new family of snake venom proteins as veficolins (venom ficolins). On the basis of its structural similarity to ficolin, we speculate that ryncolins may induce platelet aggregation and/or initiate complement activation. To determine the proteome, the whole C. rynchops venom was trypsinized and fractionated by reverse phase HPLC followed by MALDI-MS/MS analysis of the tryptic peptides. Analysis of the tandem mass spectrometric data indicated the presence of all protein families compared to the translated cDNA library. Overall, our combined approach of transcriptomics and proteomics revealed that C. rynchops venom is among the least complex snake venom characterized to date despite the presence of a new family of snake venom proteins.
OmPraba
G
G
Protein Sciences Laboratory, Department of Biological Sciences, 14 Science Drive 4, National University of Singapore, Singapore.
Chapeaurouge
Alex
A
Doley
Robin
R
Devi
K Rama
KR
Padmanaban
P
P
Venkatraman
C
C
Velmurugan
D
D
Lin
Qingsong
Q
Kini
R Manjunatha
RM
D000595:Amino Acid Sequence; D000818:Animals; D002851:Chromatography, High Pressure Liquid; D017812:Colubridae / Q000378:metabolism*; D020869:Gene Expression Profiling / Q000379:methods*; D037181:Lectins, C-Type / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D045726:Metalloproteases / Q000235:genetics / Q000378:metabolism; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D011506:Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D040901:Proteomics / Q000379:methods*; D016415:Sequence Alignment; D012910:Snake Venoms / Q000378:metabolism*; D053719:Tandem Mass Spectrometry
D037181:Lectins, C-Type; D010446:Peptide Fragments; D011506:Proteins; D012910:Snake Venoms; D045726:Metalloproteases