[Sequence analysis of 16S rDNA and genes of soluble methane monooxygenase from Methylomonas sp. GYJ3].
Soluble methane monooxygenase (MMO) from methanotrophs is a member of binuclear iron-containing multicomponent oxygenases, which can catalyze bioconversion of methane to methanol at ambient temperature and regulate methane recycle in nature. The research focused mainly on the sequence analysis of 16S rDNA and sMMO genes from Methylomonas sp. GYJ3. With the aid of the information from GenBank, the PCR primers and the sequence primers were designed, obtained a 5690bp of sMMO fragment and a 1280bp of 16S rDNA. Sequence comparison for MMOX with counterpart of other five strains showed that from 78% to 99% identity in protein level and from 71 % to 97% identity in gene level, in the separate comparison of six components, only orfY component had a lower identical. The multiple alignment of MMOX amino acid sequence with other four strains showed that there is a high conservation, especially in two Fe binding regions. 16S rDNA phylogenetic analysis demonstrated that Methylomonas sp. GYJ3 is relative with gamma proteobacteria. Phylogenetic analysis of MMOX amino acid sequence showed that Methylomonas sp. GYJ3 is closer to Methylomonas sp. KSW III of type I methanotrophs. It was concluded that Methylomonas sp. GYJ3 is belong to the genus of type I methanotroph Methylomonas, and the result was a direct evidence for the sMMO can be expressed in type I methanotrophs. The theoretical pI of hydroxylase was 6.28 and the theoretical MW of hydroxylase was 248874.41Da.
Hua
Shao-feng
SF
State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China. sfhua@yahoo.com.cn
Li
Shu-ben
SB
Tan
Hai-dong
HD
Zhao
Jia-zheng
JZ
D004275:DNA, Ribosomal / Q000737:chemistry*; D020620:Methylomonas / Q000145:classification / Q000201:enzymology* / Q000235:genetics; D008970:Molecular Weight; D010105:Oxygenases / Q000737:chemistry / Q000235:genetics*; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D012336:RNA, Ribosomal, 16S / Q000737:chemistry / Q000235:genetics*; D017422:Sequence Analysis, DNA
D004275:DNA, Ribosomal; D012336:RNA, Ribosomal, 16S; D010105:Oxygenases; C021555:methane monooxygenase