Hi, Everyone,

I found a superbook of biochemistry online including 24 chapters and 500 units. You will find very good protein stuff together with concise explanation.
http://www.e-biotek.com/ebiotek_321.htm

Enjoy it!

Thanks pguo. Great resource. Here is a list of the topics in the book:

DNA Replication, Recombination, and Repair (unit 1-64)
The Immune System (unit 65-116)
RNA Synthesis and Splicing (unit 117-166)
The Control of Gene Expression (unit 167-216)
Sensory Systems (unit 217-264)
Protein Synthesis (unit 265-312)
Molecular Motors (unit 313-356)
The Biosynthesis of Membrane Lipids and Steroids (unit 357-395)
Prelude: Biochemistry and the Genomic Revolution (unit 396-403)
The Integration of Metabolism (unit 404-434)
Nucleotide Biosynthesis (unit 435-460)
Frontmatter, appendices, and other book material (unit 461-473)
Biochemical Evolution (unit 474-477)
Exploring Proteins (unit 478-481)
Protein Structure and Function (unit 482-485)
Oxidative Phosphorylation (unit 486-488)
Exploring Evolution (unit 489-490)
The Calvin Cycle and the Pentose Phosphate Pathway (unit 491-492)
Regulatory Strategies: Enzymes and Hemoglobin (unit 493-494)
Metabolism: Basic Concepts and Design (unit 495-496)
Glycolysis and Gluconeogenesis (unit 497)
Exploring Genes (unit 498)
Protein Turnover and Amino Acid Catabolism (unit 499)
The Citric Acid Cycle (unit 500)
Enzymes: Basic Concepts and Kinetics
DNA, RNA, and the Flow of Genetic Information
Catalytic Strategies
Carbohydrates
Lipids and Cell Membranes
Membrane Channels and Pumps
Signal-Transduction Pathways: An Introduction to Information Metabolism
The Light Reactions of Photosynthesis
The Biosynthesis of Amino Acids
Fatty Acid Metabolism
Glycogen Metabolism