Updated project metadata. Nutrient adaptation is key in limiting environments for the promotion of microbial growth and survival. In microbial systems, zinc is an important component for many cellular processes and bioavailability varies greatly among different conditions. In the bacterium, Klebsiella pneumoniae, the impact of zinc limitation has not been explored at the protein level. Here, we apply a mass spectrometry-based quantitative proteomics strategy to profile the global impact of zinc limitation on the cellular proteome and extracellular environment (secretome) of K. pneumoniae. Our data defines the impact of zinc on proteins involved in transcriptional regulation and emphasizes the modulation of a vast array of proteins associated with zinc acquisition, transport, and binding. We also identify proteins in the extracellular environment associated with conventional and nonconventional modes of secretion. In particular, we focus on the impact of zinc on an uncharacterized cation transporter and the role of the ChaB transporter in influencing bacterial growth, capsule production, nad virulence. Moreover, we validate our results through transcriptional profiling of genes reprsessed under high abudnance of a histidine repression operon, hutC. Overall, we provide evidence of novel connections between zinc availability and capsule production in a bacterial system and define new roles for a transporter.