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. 1995 Jun;6(6):697–711. doi: 10.1091/mbc.6.6.697

The light chain p28 associates with a subset of inner dynein arm heavy chains in Chlamydomonas axonemes.

M LeDizet 1, G Piperno 1
PMCID: PMC301230  PMID: 7579689

Abstract

We show here that I2 and I3 inner dynein arm heavy chains of Chlamydomonas axonemes are resolved into two classes: one class associated with the protein p28 and the other associated with the protein caltractin/centrin. We have determined the nucleotide sequence of the gene encoding p28, a light chain that, together with actin and caltractin/centrin, is associated with inner dynein arms I2 and I3 of Chlamydomonas axonemes. p28 is a novel protein with affinity for a subset of the inner dynein arm heavy chains, but with no apparent significant homologies to tubulin- or actin-binding proteins. An antiserum specific for p28 showed that p28 is present along the entire axoneme. The same antiserum coimmunoprecipitated p28, actin, and dynein heavy chains 2' and 2. In contrast, an anti-caltractin/centrin antiserum coimmunoprecipitated caltractin/centrin, actin, and the heavy chains 2, 3, and 3'. It is likely that the dynein heavy chain 2 associated with p28, referred to as 2A, is a different polypeptide from dynein heavy chain 2 bound to caltractin/centrin, referred to as 2B. The complex formed by heavy chain 2B, actin, and caltractin/centrin is preferentially extracted by exposure to Nonidet P-40 and is missing in mutants lacking components 1 and 2 of the dynein regulatory complex.

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