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Comparison of the amino acid and nucleotide sequences between human and two guinea pig major basic proteins
Author(s) -
Aoki Ikuo,
Shindoh Yutaka,
Nishida Tsutomu,
Nakai Satoru,
Hong Yeong-Man,
Mio Mitsunobu,
Saito Tadayuki,
Tasaka Kenji
Publication year - 1991
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(91)80443-7
Subject(s) - complementary dna , signal peptide , amino acid , biology , molecular mass , microbiology and biotechnology , biochemistry , peptide sequence , clone (java method) , guinea pig , peptide , gene , genetics , enzyme
By means of reverse‐phase HPLC, 2 different proteins were obtained from apparently purified pig cosinophil major basic protein (MBP) and these proteins were named GMPB1 and GMBP2. It was revealed that these 2 components of MBP have similar molecular weights and pI values although the amino acid compositions were slightly different. In the previous study, we cloned and sequenced GMPB1 cDNA. Here we obtained another clone by plaque hybridization using a screening probe synthesized by means of polymerase chain reaction. After sequencing, it became apparent that this clone corresponded to GMBP2. As in the case of GMBP1, the cDNA of GMBP2 encoded pre‐proGMBP2 with 3 domains; signal peptide, acidic pro‐portion, and mature GMBP2. By comparing the sequences of GMBP1 and GMBP2, it was revealed that the proteins were quite similar to each other. In addition, their sequences also resembled those of human MBP, especially in the basic domain of mature protein: but no such similarity existed in the pro‐portion. Although the molecular weights determined by SDS‐PAGE of guinea pig and human MBPs were 11 000 and 9 300, respectively, the calculated molecular weights of these 3 MBPs were all 13.8 kDa. The calculated pI values of GMBP1, GMBP2 and human MBP were 11.7, 11.3 and 11.6, respectively. By means of Harr plot analysis, it was revealed that the amino acid sequences, not only in signal peptides but also in the bisic domains of mature proteins, were well conserved between guinea pig and human MBPs.