TY - JOUR
T1 - Purification and characterization of insulin and peptides derived from proglucagon and prosomatostatin from the fruit-eating fish, the pacu Piaractus mesopotamicus
AU - Ferraz De Lima, Jose A.
AU - Oliveira, Benedito
AU - Conlon, J. Michael
N1 - Funding Information:
This work was supported by grants from the National Science Foundation (IBN 9418819), the Brazilian Environmental and Renewable Natural Resources Institute-CEPTA/IBAMA, the UNICAMP Foundation for Learning and Research Support (FAEP), the Sao Paulo State Foundation for Research Support (FAPESP). We are grateful at the staff of CEPTA for help with the islet collection. We thank Dr Tina Settineri, PE Applied Biosystems, Foster City, CA for mass spectrometry measurements. J.A. Ferraz de Lima presented this work in partial fulfillment of the requirements for the Ph.D. degree in Biological Sciences–Physiology, Department of Physiology and Biophysics, I.B.-UNICAMP.
PY - 1999
Y1 - 1999
N2 - The fruit-eating teleost fish, the pacu Piaractus mesopotamicus (Characiformes, Characidae) is classified along with the carp and the catfish in the superorder Ostariophysi. The pacu is able to survive and grow in captive conditions feeding exclusively on carbohydrates. Hormonal polypeptides in an extract of pacu Brockmann bodies were purified to homogeneity by reversed phase HPLC and their primary structures determined by automated Edman degradation. Pacu insulin contains only two substitutions, Glu→Asp at A15 and Thr→Ser at B24 (corresponding to B22 in mammalian insulins) compared with carp insulin. The B-chains of both insulins contain a dipeptide extension to the N-terminus and a deletion of the C-terminal residue compared with human insulin. Pacu glucagon differs from catfish glucagon by a single substitution at position 17 (Arg→Gln. The primary structure of the 34 amino acid residue glucagon-like peptide (GLP) differs from catfish GLP only at positions 12 (Ser→Ala) and 33 (Pro→Gln). In common with other teleost species, the pacu expresses two somatostatin genes. Somatostatin-14, derived from preprosomatostatin-I (PSS-I), is identical to mammalian/catfish somatostatin-14. Although pacu somatostatin-II was not identified in this study, a peptide was purified that shows 67% sequence identity with residues (1-58) of catfish preprosomatostatin-II (PSS-II). This relatively high degree of sequence similarity contrasts with the fact that catfish PSS-II shows virtually no sequence identity with the corresponding PSS-II from anglerfish (Acanthopterygii) and trout (Protoacanthopterygii). A comparison of the primary structures of the islet hormones suggest that amino acid sequences may have been better conserved within the Ostariophysi than in other groups of the taxon Euteleostei that have been studied. Copyright (C) 1999 Elsevier Science Inc.
AB - The fruit-eating teleost fish, the pacu Piaractus mesopotamicus (Characiformes, Characidae) is classified along with the carp and the catfish in the superorder Ostariophysi. The pacu is able to survive and grow in captive conditions feeding exclusively on carbohydrates. Hormonal polypeptides in an extract of pacu Brockmann bodies were purified to homogeneity by reversed phase HPLC and their primary structures determined by automated Edman degradation. Pacu insulin contains only two substitutions, Glu→Asp at A15 and Thr→Ser at B24 (corresponding to B22 in mammalian insulins) compared with carp insulin. The B-chains of both insulins contain a dipeptide extension to the N-terminus and a deletion of the C-terminal residue compared with human insulin. Pacu glucagon differs from catfish glucagon by a single substitution at position 17 (Arg→Gln. The primary structure of the 34 amino acid residue glucagon-like peptide (GLP) differs from catfish GLP only at positions 12 (Ser→Ala) and 33 (Pro→Gln). In common with other teleost species, the pacu expresses two somatostatin genes. Somatostatin-14, derived from preprosomatostatin-I (PSS-I), is identical to mammalian/catfish somatostatin-14. Although pacu somatostatin-II was not identified in this study, a peptide was purified that shows 67% sequence identity with residues (1-58) of catfish preprosomatostatin-II (PSS-II). This relatively high degree of sequence similarity contrasts with the fact that catfish PSS-II shows virtually no sequence identity with the corresponding PSS-II from anglerfish (Acanthopterygii) and trout (Protoacanthopterygii). A comparison of the primary structures of the islet hormones suggest that amino acid sequences may have been better conserved within the Ostariophysi than in other groups of the taxon Euteleostei that have been studied. Copyright (C) 1999 Elsevier Science Inc.
KW - Brockmann body
KW - Characiformes
KW - Glucagon
KW - Glucagon-like peptide
KW - HPLC purification
KW - Insulin
KW - Ostariophysi
KW - Prosomatostatin
KW - Somatostatin
KW - Teleost
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U2 - 10.1016/S0305-0491(98)10164-5
DO - 10.1016/S0305-0491(98)10164-5
M3 - Article
C2 - 10327603
AN - SCOPUS:0033018340
SN - 0305-0491
VL - 122
SP - 127
EP - 135
JO - Comparative Biochemistry and Physiology - B Biochemistry and Molecular Biology
JF - Comparative Biochemistry and Physiology - B Biochemistry and Molecular Biology
IS - 1
ER -