Murayama N, Hayashi M A, Ohi H, Ferreira L A, Hermann V V, Saito H, Fujita Y, Higuchi S, Fernandes B L, Yamane T, de Camargo A C
School of Pharmaceutical Sciences, Showa University, Shinagawa, Tokyo, Japan.
Proc Natl Acad Sci U S A. 1997 Feb 18;94(4):1189-93. doi: 10.1073/pnas.94.4.1189.
A 1.8-kb cDNA clone was isolated from a Bothrops jararaca venom gland cDNA library that encodes a 256-aa precursor for bradykinin-potentiating peptides (angiotensin-converting enzyme inhibitors) and a C-type natriuretic peptide (CNP). The seven bradykinin-potentiating peptides are aligned tandemly after the hydrophobic signal peptide sequence, followed by a putative intervening sequence and a CNP at the C terminus. Northern blot analysis indicated the predominant expression of a 1.8-kb mRNA in the venom glands as well as in the spleen and the brain. Two lower intensity mRNA bands of 3.5 kb and 5.7 kb also hybridized to the cDNA clone. Radioimmunoassay for the CNP was performed using the antiserum against rat CNP. The presence of CNP immunoreactivity was detected in the low molecular weight fraction of the Bothrops jararaca venom.
从巴西矛头蝮蛇毒腺cDNA文库中分离出一个1.8kb的cDNA克隆,它编码一种缓激肽增强肽(血管紧张素转换酶抑制剂)和一种C型利钠肽(CNP)的256个氨基酸的前体。七个缓激肽增强肽在疏水信号肽序列之后串联排列,接着是一个推测的间隔序列,C端为一个CNP。Northern印迹分析表明,1.8kb mRNA在毒腺以及脾脏和大脑中占主导表达。另外两条强度较低的3.5kb和5.7kb mRNA条带也与该cDNA克隆杂交。使用抗大鼠CNP的抗血清对CNP进行放射免疫测定。在巴西矛头蝮蛇毒的低分子量组分中检测到CNP免疫反应性。