Occurrence and Sequences

The azurins have 128 or 129 amino acids (Mr —14,000) at least 10 have been sequenced (16). Of the nine sequences considered by Rydon and Lundgren, 47 residues are invariant, including His 46, Cys 112, His 117, and Met 121, which coordinate the Cu, and a further 32 are conservatively substituted (27). There is an additional interaction of 

See Ref. 67 Ref 66 gives a value of 5800 M cm f Cucumber basic protein, previously referred to as plantacyanin. f Thiobacillus versutus. e pH 2. 

In 1985 the existence of two new classes of bacterial blue proteins, the pseudoazurins and amicyanins, was demonstrated (28). Sequence information is available for pseudoazurin from Pseudomonas AMI (28), Achromobacter cycloclastes (29), as well as A. faecalis, for which the structure has been determined (12). The name pseudoazurin rather than cupredoxin is used here. The sequence for amicyanin, also present in Pseudomonas AMI, has been reported, and that for amicyanin from Thiobacillus versutus is being determined. Preliminary X-ray crystallographic information has been reported for amicyanin from T. versutus (30). 

The other categories listed in Table I are at present single examples (16,18, 20). 

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Introduction Classification Occurrence and Sequences Functional Role X-Ray Crystal Structures... 

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