Vertical distributions of dimethyl sulfide and dimethylsulfoniopropionate and impacts of DMSP lyase and bacteria in the Yellow Sea and East China Sea.

Dimethyl sulfide (DMS), a degradation product of dimethylsulfoniopropionate (DMSP), is a significant trace gas influencing global temperature. This study examined the distribution of DMSP lyase activity (DLA) and the degradation of DMSP and dimethyl sulfoxide (DMSO) by bacteria to elucidate the influences of DMSP lyase and bacteria on the distributions of DMS and DMSP in the Yellow Sea and the East China Sea during the summer. We observed that DMS and DMSP concentrations in transect B, located near the Yellow Sea Cold Water Mass, declined with deepening water depth, coinciding with the changing trend of the temperatures.

DMSP-Producing Bacteria Are More Abundant in the Surface Microlayer than Subsurface Seawater of the East China Sea.

Microbial production and catabolism of dimethylsulfoniopropionate (DMSP), generating the climatically active gases dimethyl sulfide (DMS) and methanethiol (MeSH), have key roles in global carbon and sulfur cycling, chemotaxis, and atmospheric chemistry. Microorganisms in the sea surface microlayer (SML), the interface between seawater and atmosphere, likely play an important role in the generation of DMS and MeSH and their exchange to the atmosphere, but little is known about these SML microorganisms. Here, we investigated the differences between bacterial community structure and the distribution and transcription profiles of the key bacterial DMSP synthesis (dsyB and mmtN) and catabolic (dmdA and dddP) genes in East China Sea SML and subsurface seawater (SSW) samples.

The Role of Mms22p in DNA Damage Response in Candida albicans.

To ensure correct DNA replication, eukaryotes have signaling pathways that respond to replication-associated DNA damage and trigger repair. In both Saccharomyces cerevisiae and Schizosaccharomyces pombe, a complex of proteins, including the cullin protein Rtt101p and two adapter proteins Mms22p and Mms1p, is important for proper response to replication stress. We have investigated this system in Candida albicans.